Output control device and control method of laser and laser wind measuring radar
阅读说明：本技术 激光器的输出控制装置及其控制方法、激光测风雷达 (Output control device and control method of laser and laser wind measuring radar ) 是由 张贵平 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种激光器的输出控制装置及其控制方法、激光测风雷达,该激光器的输出控制装置包括同步信号发生器以及在连续单频激光器出射光路上依次排布的开关调制型声光调制器和线性调制型声光调制器；同步信号发生器的输入端分别接收时钟信号、脉宽信号、上升时间信号以及步进信号；同步信号发生器根据其接收的信号,控制开关调制型声光调制器将连续单频激光器输出的连续激光调制为第一波形为方波的脉冲激光,控制线性调制型声光调制器将第一波形调制为第二波形为上升沿增益小于下降沿的类梯形波。本发明实施例能够优化脉冲激光的输出波形,提高脉冲激光的输出能量。(The invention discloses an output control device of a laser, a control method thereof and a laser wind-finding radar, wherein the output control device of the laser comprises a synchronous signal generator, a switch modulation type acousto-optic modulator and a linear modulation type acousto-optic modulator which are sequentially arranged on an emergent light path of a continuous single-frequency laser; the input end of the synchronous signal generator respectively receives a clock signal, a pulse width signal, a rising time signal and a stepping signal; the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform being square wave according to the received signal, and controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform being trapezoid-like wave with rising edge gain being smaller than falling edge. The embodiment of the invention can optimize the output waveform of the pulse laser and improve the output energy of the pulse laser.)
1. An output control device for a laser, for converting a continuous laser beam output from a continuous single-frequency laser into a pulse laser beam, comprising: the synchronous signal generator, and a switch modulation type acousto-optic modulator and a linear modulation type acousto-optic modulator which are sequentially arranged on the emergent light path of the continuous single-frequency laser;
the input end of the synchronous signal generator respectively receives the clock signal, the pulse width signal, the rising time signal and the stepping signal; the first output end of the synchronous signal generator is electrically connected with the switch modulation type acousto-optic modulator, and the second output end of the synchronous signal generator is electrically connected with the linear modulation type acousto-optic modulator;
the synchronous signal generator is used for controlling the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform according to the clock signal and the pulse width signal; wherein the first waveform is a square wave;
the synchronous signal generator is further used for controlling the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein the second waveform is a trapezoid-like wave.
2. The output control device of laser according to claim 1, wherein the synchronization signal generator comprises a logic control module and a digital-to-analog conversion module;
the logic control module is used for respectively receiving a clock signal, a pulse width signal, a rising time signal and a stepping signal and outputting a first digital signal to the digital-to-analog conversion module according to the clock signal and the pulse width signal; outputting a second digital signal to the digital-to-analog conversion module according to the clock signal, the pulse width signal, the rising time signal and the stepping signal;
the first output end of the digital-to-analog conversion module is electrically connected with the switch modulation type acousto-optic modulator, and the second output end of the digital-to-analog conversion module is electrically connected with the linear modulation type acousto-optic modulator; the data conversion module is used for converting the first digital signal into a first analog signal so as to control the switch modulation type acousto-optic modulator to modulate continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform, and converting the second digital signal into a second analog signal so as to control the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform.
3. The output control device of the laser according to claim 2, wherein the logic control module comprises a counter unit, a storage unit, a digital-to-analog converter unit, a first comparator unit, a second comparator unit, a first selector unit and a second selector unit;
the counter unit is used for adding one to the count value at the rising edge of each clock signal;
the first comparator unit is used for comparing the count value with the pulse width signal and outputting a first comparison result to the first selector unit and the digital-to-analog converter unit;
the digital-to-analog converter unit is used for outputting the maximum value or the minimum value of the first digital signal according to the first comparison result; the maximum value of the first digital signal is the maximum output value of the digital-to-analog converter unit, and the minimum value of the first digital signal is the minimum output value of the digital-to-analog converter unit;
the second comparator unit is used for comparing the count value with the rising time signal and outputting a second comparison result to the second selector unit;
the first selector unit is used for selectively outputting first address data to the storage unit according to the first comparison result;
the second selector unit is used for selectively outputting second address data to the storage unit according to the second comparison result;
the memory unit comprises a plurality of memory addresses, each memory address correspondingly stores one second digital signal, and the second digital signal stored in the previous memory address in each memory address is smaller than the second digital signal stored in the next memory address; the storage unit is used for controlling the output of the second digital signal in a preset storage address according to the first address data, the second address data and the stepping signal; the second digital signal stored in the storage address of the storage unit is a digital signal with a preset rising edge.
4. The output control apparatus of the laser according to claim 3, wherein the input terminal of the synchronization signal generator further receives a reset signal;
and the counter is also used for clearing the count value when the count value reaches a preset count value according to the reset signal.
5. The output control device of the laser according to claim 2, wherein the synchronization signal generator further comprises a first signal amplification module and a second signal amplification module;
the first signal amplification module is electrically connected between the first output end of the digital-to-analog conversion module and the switch modulation type acousto-optic modulator; the first signal amplification module is used for carrying out signal amplification on the first analog signal;
the second signal amplification module is electrically connected between the second output end of the digital-to-analog conversion module and the linear modulation type acousto-optic modulator; the second signal amplification module is used for carrying out signal amplification on the second analog signal.
6. The output control device of claim 5, wherein the first signal amplification module and the second signal amplification module each comprise a two-stage signal amplifier.
7. The output control apparatus of a laser according to claim 1, further comprising: an optical amplifier;
the optical amplifier is used for amplifying the pulse laser with the second waveform into pulse laser with a third waveform; wherein the third waveform is a trapezoid-like wave.
8. A laser output control method performed by the laser output control apparatus according to any one of claims 1 to 7, comprising:
the synchronous signal generator respectively acquires a clock signal, a pulse width signal, a rising time signal and a stepping signal;
the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform according to the clock signal and the pulse width signal; wherein the first waveform is a square wave;
the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein the second waveform is a trapezoid-like wave.
9. The method of claim 8, wherein the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser light output from the continuous single-frequency laser into the pulsed laser light of a first waveform according to the clock signal and the pulse width signal, and comprises:
counting according to the clock signals, and adding one to a count value at the rising edge of each clock signal;
judging whether the count value is larger than the pulse width signal;
if yes, outputting the minimum value of the first digital signal;
if not, outputting the maximum value of the first digital signal;
the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal, and includes:
counting according to the clock signals, and adding one to a count value at the rising edge of each clock signal;
judging whether the count value is larger than the pulse width signal;
if yes, outputting the minimum value of the second digital signal;
judging whether the count value is greater than the rising time signal;
if yes, outputting the maximum value of the second digital signal;
if not, outputting a stepping sampling signal of the second digital signal according to the stepping signal;
the synchronization signal generator at least comprises a digital-to-analog converter unit, and the maximum value of the first digital signal is the maximum output value of the digital-to-analog converter unit; the minimum value of the first digital signal is the minimum output value of the data converter unit; the second digital signal is a data signal with a preset rising edge.
10. A lidar characterized by comprising: a continuous single-frequency laser, a beam splitter, a circulator, a beam combiner, a detection unit, a data processing unit and a laser output control device as claimed in any one of claims 1 to 8;
the beam splitter is used for splitting continuous laser emitted by the continuous single-frequency laser into a first light beam and a second light beam, the first light beam is incident to the laser output control device, and the second light beam is incident to a first input end of the beam combiner;
the laser output control device is used for converting the first light beam into pulse laser and transmitting the pulse laser to the first end of the circulator;
the circulator is used for emitting the pulse laser through the second end and receiving an echo light beam, and the third end of the circulator transmits the echo light beam to the second input end of the beam combiner;
the detection unit is used for receiving the second light beam and the echo light beam;
the data processing unit is used for calculating the wind speed.
Technical Field
The embodiment of the invention relates to the field of lasers, in particular to an output control device of a laser, a control method of the output control device and a laser wind-finding radar.
Background
The accurate atmospheric wind field observation has great significance in improving the accuracy of weather forecast and storm forecast, improving climate research models, military environment forecast, forecasting possible biological weapon release environments, improving national defense safety and the like.
At present, the main atmospheric wind field measurement means include doppler sodar, microwave radar and laser wind radar. The laser has the characteristics of monochromaticity and strong coherence, and the wavelength is short, so that the Doppler wind measurement information which is strong enough can be obtained by utilizing the backscattered light of the aerosol, the micro-wind speed can be favorably detected, the wind measurement precision is high, and the laser wind measurement radar has irreplaceable advantages in the wind measurement field.
The existing laser wind-finding radar, output controlling means through the laser instrument, make the continuous laser of continuous single frequency laser output convert pulse laser into, the output controlling means of laser instrument includes two-stage switch modulation type acousto-optic modulator, the pulse laser who modulates through two-stage switch modulation type acousto-optic modulator passes through the light amplifier after outputting, make the gain of rising edge very big and then form a peak, this peak leads to light amplifier to produce nonlinear effect, reduce the peak power of amplifier, serious meeting leads to the pulse split, when the pulse is wideer, this effect can be more obvious.
Disclosure of Invention
In view of this, embodiments of the present invention provide a laser output control apparatus and method, and a laser wind radar, so as to optimize an output waveform of a pulse laser and improve output energy of the pulse laser.
In a first aspect, an embodiment of the present invention provides a laser output control apparatus, configured to convert continuous laser output by a continuous single-frequency laser into pulse laser, where the laser output control apparatus includes a synchronous signal generator, and a switch modulation type acousto-optic modulator and a linear modulation type acousto-optic modulator that are sequentially arranged on an outgoing light path of the continuous single-frequency laser;
the input end of the synchronous signal generator respectively receives a clock signal, a pulse width signal, a rising time signal and a stepping signal; the first output end of the synchronous signal generator is electrically connected with the switch modulation type acousto-optic modulator, and the second output end of the synchronous signal generator is electrically connected with the linear modulation type acousto-optic modulator;
the synchronous signal generator is used for controlling the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform according to the clock signal and the pulse width signal; wherein the first waveform is a square wave;
the synchronous signal generator is further used for controlling the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein the second waveform is a trapezoid-like wave.
Optionally, the synchronization signal generator includes a logic control module and a digital-to-analog conversion module;
the logic control module is used for respectively receiving a clock signal, a pulse width signal, a rising time signal and a stepping signal and outputting a first digital signal to the digital-to-analog conversion module according to the clock signal and the pulse width signal; outputting a second digital signal to the digital-to-analog conversion module according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein the first digital signal comprises the digital-to-analog conversion;
the first output end of the digital-to-analog conversion module is electrically connected with the switch modulation type acousto-optic modulator, and the second output end of the digital-to-analog conversion module is electrically connected with the linear modulation type acousto-optic modulator; the data conversion module is used for converting the first digital signal into a first analog signal so as to control the switch modulation type acousto-optic modulator to modulate continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform, and converting the second digital signal into a second analog signal so as to control the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform.
Optionally, the logic control module includes a counter unit, a storage unit, a digital-to-analog converter unit, a first comparator unit, a second comparator unit, a first selector unit, and a second selector unit;
the counter unit is used for adding one to the count value at the rising edge of each clock signal;
the first comparator unit is used for comparing the count value with the pulse width signal and outputting a first comparison result to the first selector unit and the digital-to-analog converter unit;
the digital-to-analog converter unit is used for outputting the maximum value or the minimum value of the first digital signal according to the first comparison result; the maximum value of the first digital signal is the maximum output value of the digital-to-analog converter unit, and the minimum value of the first digital signal is the minimum output value of the digital-to-analog converter unit;
the second comparator unit is used for comparing the count value with the rising time signal and outputting a second comparison result to the second selector unit;
the first selector unit is used for selectively outputting first address data to the storage unit according to the first comparison result;
the second selector unit is used for selectively outputting second address data to the storage unit according to the second comparison result;
the memory unit comprises a plurality of memory addresses, each memory address correspondingly stores one second digital signal, and the second digital signal stored in the previous memory address in each memory address is smaller than the second digital signal stored in the next memory address; the storage unit is used for controlling the output of the second digital signal in a preset storage address according to the first address data, the second address data and the stepping signal; the second digital signal stored in the storage address of the storage unit is a digital signal with a preset rising edge.
Optionally, the input end of the synchronization signal generator further receives a reset signal;
and the counter is also used for clearing the count value when the count value reaches a preset count value according to the reset signal.
Optionally, the synchronization signal generator further includes a first signal amplification module and a second signal amplification module;
the first signal amplification module is electrically connected between the first output end of the digital-to-analog conversion module and the switch modulation type acousto-optic modulator; the first signal amplification module is used for carrying out signal amplification on the first analog signal;
the second signal amplification module is electrically connected between the second output end of the digital-to-analog conversion module and the linear modulation type acousto-optic modulator; the second signal amplification module is used for carrying out signal amplification on the second analog signal.
Optionally, the first signal amplification module and the second signal amplification module each include two stages of signal amplifiers.
Optionally, the laser processing system further comprises an optical amplifier, wherein the optical amplifier is used for amplifying the pulse laser light with the second waveform into pulse laser light with a third waveform; wherein the third waveform is a trapezoid-like wave.
In a second aspect, an embodiment of the present invention further provides a laser output control method, which is executed by using any one of the laser output control apparatuses described above, and includes:
the synchronous signal generator respectively acquires a clock signal, a pulse width signal, a rising time signal and a stepping signal;
the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform according to the clock signal and the pulse width signal; wherein the first waveform is a square wave;
the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein the second waveform is a trapezoid-like wave.
Optionally, the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into the pulse laser with the first waveform according to the clock signal and the pulse width signal, and includes:
counting according to the clock signals, and adding one to a count value at the rising edge of each clock signal;
judging whether the count value is larger than the pulse width signal;
if yes, outputting the minimum value of the first digital signal;
if not, outputting the maximum value of the first digital signal;
the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal, and includes:
counting according to the clock signals, and adding one to a count value at the rising edge of each clock signal;
judging whether the count value is larger than the pulse width signal;
if yes, outputting the minimum value of the second digital signal;
judging whether the count value is greater than the rising time signal;
if yes, outputting the maximum value of the second digital signal;
if not, outputting a stepping sampling signal of the second digital signal according to the stepping signal;
the synchronization signal generator at least comprises a digital-to-analog converter unit, and the maximum value of the first digital signal is the maximum output value of the digital-to-analog converter unit; the minimum value of the first digital signal is the minimum output value of the data converter unit; the second digital signal is a data signal with a preset rising edge.
In a third aspect, an embodiment of the present invention further provides a laser wind radar, including a continuous single-frequency laser, a beam splitter, a circulator, a beam combiner, a detection unit, a data processing unit, and the laser output control apparatus according to any one of the above claims;
the beam splitter is used for splitting continuous laser emitted by the continuous single-frequency laser into a first light beam and a second light beam, the first light beam is incident to the laser output control device, and the second light beam is incident to a first input end of the beam combiner;
the laser output control device is used for converting the first light beam into pulse laser and transmitting the pulse laser to the first end of the circulator;
the circulator is used for emitting the pulse laser through the second end and receiving an echo light beam, and the third end of the circulator transmits the echo light beam to the second input end of the beam combiner;
the detection unit is used for receiving the second light beam and the echo light beam;
the data processing unit is used for calculating the wind speed.
According to the laser output control device provided by the embodiment of the invention, the switching modulation type acousto-optic modulator is controlled by the synchronous signal generator to modulate the continuous laser output by the continuous single-frequency laser into the pulse laser with the first waveform, and the linear modulation type acousto-optic modulator is synchronously controlled to modulate the first waveform into the second waveform, so that the square wave of the first waveform is modulated into the trapezoid-like wave with the rising edge gain of the second waveform being smaller than that of the falling edge, the output waveform of the pulse laser is optimized, and the output energy of the pulse laser is improved.
Drawings
Fig. 1 is a block diagram of a laser output control apparatus according to an embodiment of the present invention;
FIG. 2 is a graph illustrating a first waveform according to an embodiment of the present invention;
FIG. 3 is a graph illustrating a second waveform according to an embodiment of the present invention;
fig. 4 is a block diagram of a structure of another laser output control apparatus according to an embodiment of the present invention;
fig. 5 is a block diagram of a structure of another laser output control apparatus according to an embodiment of the present invention;
fig. 6 is a block diagram of an output control apparatus of another laser according to an embodiment of the present invention;
fig. 7 is a circuit diagram of an output control apparatus of another laser according to an embodiment of the present invention;
fig. 8 is a block diagram of an output control apparatus of another laser according to an embodiment of the present invention;
FIG. 9 is a graph illustrating a third waveform according to an embodiment of the present invention;
fig. 10 is a schematic flowchart of a laser output control method according to an embodiment of the present invention;
FIG. 11 is a schematic flow chart illustrating another method for controlling laser output according to an embodiment of the present invention;
FIG. 12 is a schematic flow chart illustrating a further method for controlling laser output according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a laser wind-finding radar according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through intervening elements. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The embodiment of the invention provides an output control device of a laser, which is used for converting continuous light output by a continuous single-frequency laser into pulse laser and can be applied to a pulse coherent Doppler laser wind measuring radar. Fig. 1 is a block diagram of a laser output control apparatus according to an embodiment of the present invention, and as shown in fig. 1, the laser output control apparatus includes a
Specifically, fig. 2 is a schematic graph of a first waveform provided in the embodiment of the present invention, and fig. 3 is a schematic graph of a second waveform provided in the embodiment of the present invention. As shown in connection with fig. 1, 2 and 3, the clock signal clk received by the
Therefore, the synchronous signal generator can respectively control the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into the pulse laser with the first waveform being the square wave based on the same clock signal, and control the linear modulation type acousto-optic modulator to modulate the pulse laser with the first waveform being the square wave into the pulse laser with the second waveform being the trapezoid-like wave with the rising edge gain being smaller than the falling edge gain, so that the output waveform of the pulse laser can be optimized, the output energy of the pulse laser is improved, and the requirement of the wind measuring radar is met. In addition, the switch modulation type acousto-optic modulator and the linear modulation type acousto-optic modulator are connected in series, so that the extinction ratio of pulse laser is improved, the signal-to-noise ratio of the laser radar is improved, and high-quality laser pulses are generated.
It should be noted that fig. 1 is a diagram illustrating an embodiment of the present invention, and a block diagram of the structure of the embodiment of the present invention only shows the connection relationship between the structures in the laser output control device, and does not represent the relative positional relationship between the structures.
Optionally, fig. 4 is a block diagram of a structure of an output control apparatus of another laser according to an embodiment of the present invention, and as shown in fig. 4, the
The
In this way, after the digital-to-analog conversion module converts the first digital signal into the first analog signal, the switch modulation type acousto-optic modulator is controlled to modulate the continuous laser output by the continuous single-frequency laser into the pulse laser with the first waveform; and the data conversion module converts the second digital signal into a second analog signal, and the linear modulation type acousto-optic modulator is controlled to modulate the pulse laser with the first waveform into pulse laser with the second waveform so as to optimize the output waveform of the pulse laser and improve the output energy of the pulse laser to meet the requirement of the anemometry radar.
Optionally, fig. 5 is a block diagram of a structure of an output control apparatus of another laser device according to an embodiment of the present invention, and as shown in fig. 5, the
The counter unit 111 is configured to increment a count value of each clock signal clk when the rising edge of the clock signal clk arrives, so as to implement a counting function; the counter unit 111 performs the counting specifically by incrementing the count value by one when the count value is smaller than the maximum count value and the rising edge of each clock signal clk comes; when the count value of the counter unit 111 reaches its maximum value, the counter unit 111 clears its count value and starts to count again from zero.
The
The
Accordingly, when the
The second comparator unit 151 is configured to compare the count value of the counter unit 111 with the rise time signal rise _ time, and output a second comparison result to the second selector unit 171, so that the second selector unit 171 outputs corresponding second address data to the storage unit 121 according to the second comparison result; when the second selector unit 171 receives the second comparison result, that is, the count value of the counter unit 111 is smaller than the rise time signal rise _ time, the second selector unit 171 outputs the second address data of the port 020 to the storage unit 121, where the second address data is the sum of the step signal add _ step and the second address data output by the previous clock signal clk, so that the storage unit 121 sequentially outputs the second digital signals of the storage addresses from the minimum storage address according to the step signal add _ step according to the second address data output at this time until the count value of the counter unit 111 equals to the rise time signal rise _ time, that is, the sample value of the second digital signal is output according to the step signal add _ step, and the sample value of the second digital signal is converted into a corresponding second analog signal by the digital-to-analog conversion module 102 and output to the linear modulation type acousto-optic modulator 40, so that the linear modulation type acousto-optic modulator 40 sequentially outputs the rising edge of the second waveform; when the second selector unit 171 receives the second comparison result, and the count value of the counter unit 111 is greater than the rise time signal rise _ time, the second selector unit 171 outputs the second address data of the port 021 to the storage unit 121, so that when the storage unit 121 receives the second address data, the storage unit can output the second digital signal in the maximum storage address, that is, the maximum value of the second digital signal, and the maximum value of the second digital signal is converted into the corresponding second analog signal by the data conversion module 102 and output to the linear modulation type aom 40, so that the linear modulation type aom 40 outputs the peak of the second waveform. Wherein the step signal add _ step may be equal to the rise time signal rise _ time divided by the period of the clock signal clk.
In this way, the switch modulation type acousto-optic modulator and the linear modulation type acousto-optic modulator can modulate the continuous laser output by the continuous single-frequency laser into the pulse laser with the first waveform and modulate the pulse laser with the first waveform into the pulse laser with the second waveform based on the count value of the same counter unit, so that the output waveform of the pulse laser can be optimized, the output energy of the pulse laser can be improved, and the requirement of the anemometry radar can be met.
Optionally, the input end of the
Optionally, fig. 6 is a block diagram of a structure of an output control apparatus of another laser according to an embodiment of the present invention. The
Specifically, the first
For example, fig. 7 is a circuit diagram of an output control apparatus of another laser according to an embodiment of the present invention. As shown in fig. 7, the digital-to-analog converter module may be, for example, a high-speed digital-to-analog converter (U1). The digital-to-analog converter module (U1) receives clock signals (CLK1, CLK2), wireless signals (WRT1, WRT2), 14-bit first digital signals (P1 DB 0-13) and 14-bit second digital signals (P2 DB 0-13), respectively. The digital-to-analog converter module converts the received 14-bit first digital signal into a corresponding current signal and outputs the corresponding current signal through output ends IOUTA1 and IOUTB1, so that the first signal amplification module can amplify the current signal converted from the first digital signal; the digital-to-analog converter module converts the 14-bit second digital signal received by the digital-to-analog converter module into a corresponding current signal and outputs the corresponding current signal through output ends IOUTA2 and IOUTB2, so that the second signal amplification module can amplify the current signal converted by the second digital signal.
The first signal amplifying module may include capacitors (C5, C6, C9, C10), resistors (R1, R2, R4, R5, R6, R7, R8, R9, R20, R21), and operational amplifiers (U2 and U3) to amplify the first analog signal, and the first analog signal amplified by the first signal amplifying module is input to the switching type acousto-
Therefore, the first analog signal is subjected to signal amplification through the two-stage signal amplifier of the first signal amplification module, and the requirement of the switch modulation type acousto-optic modulator on the input signal can be met; the second analog signal is subjected to signal amplification through the second signal amplification module and the two-stage signal amplifier, so that the requirement of the linear modulation type acousto-optic modulator on the input signal can be met, and the output waveform of the pulse laser is further optimized.
In addition, the output device of the laser can also comprise a current-voltage conversion module and a signal control module. The current-voltage conversion module can convert corresponding power signals (D3V3, A3V3) into power supplies of the digital-to-analog conversion module and provide the power supplies to power signal input ends (DVDD1, DVDD2, AVDD) of the digital-to-analog conversion module. Accordingly, the signal control module can provide respective reference signals (REFIO), gain signals (GAINCTRL), and current control signals (FSAD1 and FSAD2) to control the magnitude of the signal output by the digital-to-analog conversion module.
For example, the current-voltage conversion module may include capacitors (C1, C2, C3, C4, C7, C8) and resistors (R3) to convert the current signals into voltage signals in series and/or parallel. The signal control module can comprise a capacitor (C15) and resistors (R14, R16), and the magnitude of the current signal output by the digital-to-analog conversion module is controlled in a serial and/or parallel mode.
Optionally, fig. 8 is a block diagram of a structure of an output control apparatus of another laser according to an embodiment of the present invention. The laser output control device further includes an
Therefore, the second waveform is subjected to signal amplification through the optical amplifier, so that the waveform of the pulse laser output by the continuous single-frequency laser can be further optimized, the output energy of the pulse laser is improved, and the requirement of the wind measuring radar is met.
The embodiment of the invention also provides an output control method of the laser, which can be executed by adopting the output control device of the laser provided by the embodiment of the invention. Fig. 10 is a flowchart illustrating a laser output control method according to an embodiment of the present invention. As shown in fig. 10, the output control method includes:
s100, the synchronous signal generator respectively obtains a clock signal, a pulse width signal, a rising time signal and a stepping signal.
Specifically, the clock signal received by the synchronous signal generator is related to the periodic phase of the signal; the pulse width signal received by the synchronous signal generator is related to the waveform width of the laser pulse; the rising time signal received by the synchronous signal generator is related to the rising edge length of the waveform of the laser pulse; the step signal received by the synchronization signal generator is related to the position of the rising edge of the waveform of the laser pulse. Wherein the step signal may be equal to the rise time signal divided by the period of the clock signal.
S200, the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform according to a clock signal and a pulse width signal; wherein the first waveform is a square wave.
Specifically, the synchronous signal generator can modulate the continuous laser light output by the continuous single-frequency laser into the pulse laser light with the first waveform by comparing the magnitude relationship between the received clock signal and the pulse width signal and controlling the switch modulation type acousto-optic modulator according to the magnitude relationship between the clock signal and the pulse width signal.
S300, the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the first waveform into a second waveform according to the clock signal, the pulse width signal, the rising time signal and the stepping signal; wherein, the second waveform is a trapezoid-like wave.
Specifically, the synchronous signal generator can also compare the magnitude relationship between the received clock signal and the pulse width signal and compare the magnitude relationship between the clock signal and the rise time signal, and control the linear modulation type acousto-optic modulator to modulate the pulse laser with the first waveform output by the switching modulation type acousto-optic modulator into the pulse laser with the second waveform.
On the basis of the foregoing solution, optionally, fig. 11 is a schematic flowchart of a further laser output control method provided in this embodiment of the present invention, and as shown in fig. 11, a synchronous signal generator in the laser output control method provided in this embodiment controls a switch modulation type acousto-optic modulator to modulate continuous laser light output by a continuous single-frequency laser into pulse laser light with a first waveform according to a clock signal and a pulse width signal, which specifically includes the following steps:
s201, counting is carried out according to the clock signals, and the count value is increased by one at the rising edge of each clock signal.
S202, judging whether the count value is larger than the pulse width signal; if yes, go to S203; if not, go to S204.
And S203, outputting the minimum value of the first digital signal.
And S204, outputting the maximum value of the first digital signal.
Specifically, the sync signal generator counts according to the rising edge of the clock signal, and the count value is incremented by one when the rising edge of each clock signal arrives. At this time, the count value is compared with the magnitude of the pulse width signal, and a corresponding first digital signal is output. When the counting value is smaller than the pulse width signal, outputting the maximum value of a first digital signal, converting the maximum value of the first digital signal into a corresponding first analog signal through a digital-to-analog conversion module, and outputting the corresponding first analog signal to the switch modulation type acousto-optic modulator so that the switch acousto-optic modulator outputs the peak of a first waveform; when the counting value is larger than the pulse width signal, the minimum value of the first digital signal is output, and the minimum value of the first digital signal is converted into a corresponding first analog signal through the digital-to-analog conversion module and is output to the switch modulation type acousto-optic modulator, so that the switch modulation type acousto-optic modulator outputs the wave trough of the first waveform. In addition, when the count value counted according to the rising edge of the clock signal reaches a preset value, namely the maximum count value, the count value is cleared, and the counting is started again from zero.
In this way, the switching modulation type acousto-optic modulator can modulate the continuous laser light output from the continuous single-frequency laser into the pulse laser light of the first waveform according to the count value of the counter unit and the magnitude of the pulse width signal.
Based on the foregoing solution, optionally, fig. 12 is a schematic flowchart of another laser output control method according to an embodiment of the present invention, and as shown in fig. 12, a synchronization signal generator in the laser output control method according to this embodiment controls a linear modulation type acousto-optic modulator to modulate a first waveform into a second waveform according to a clock signal, a pulse width signal, a rise time signal, and a step signal, and specifically includes the following steps:
s301, counting is carried out according to the clock signals, and the count value is increased by one at the rising edge of each clock signal.
S302, judging whether the count value is larger than the pulse width signal; if yes, go to S303.
And S303, outputting the minimum value of the second digital signal.
S304, judging whether the count value is larger than the rising time signal; if yes, S305 is performed.
S305, outputting the maximum value of the second digital signal; if not, go to S306.
And S306, outputting a step sampling signal of the second digital signal according to the step signal.
Specifically, the synchronization signal emitter may be provided with a corresponding storage unit, the storage unit includes a plurality of storage addresses, each storage address correspondingly stores a second digital signal, and the second digital signal stored in the previous storage address in each storage address is smaller than the second digital signal stored in the subsequent storage address, that is, the second digital signal stored in the storage address of the storage unit is a digital signal with a preset rising edge. For example, the memory cell includes 8000 memory addresses, each of which stores the second digital signal of 14 bits, and the
Since the synchronous signal generator counts according to the rising edge of the clock signal and adds one to the count value when the rising edge of each clock signal arrives, the second digital signal output of the corresponding storage address in the storage unit can be controlled by comparing the count value with the magnitude of the pulse width signal and comparing the count value with the magnitude of the rising time signal.
When the count value is greater than the pulse width signal, the storage unit can output a second digital signal in the minimum storage address, namely the minimum value of the second digital signal, and the minimum value of the second digital signal is converted into a corresponding second analog signal by the data conversion module and output to the linear modulation type acousto-optic modulator, so that the linear modulation type acousto-optic modulator outputs a trough of a second waveform; when the counting value is smaller than the rising time signal, the storage unit can sequentially output the second digital signals of each storage address from the minimum storage address according to the stepping signal until the counting value is equal to the rising time signal, namely, the sampling value of the second digital signals is output according to the stepping signal, and the sampling value of the second digital signals is converted into a corresponding second analog signal by the digital-to-analog conversion module and is output to the linear modulation type acousto-optic modulator, so that the linear modulation type acousto-optic modulator outputs the rising edge of a second waveform; when the count value is greater than the rise time signal, the storage unit can output a second digital signal in the maximum storage address, namely the maximum value of the second digital signal, and the maximum value of the second digital signal is converted into a corresponding second analog signal by the data conversion module and output to the linear modulation type acousto-optic modulator, so that the linear modulation type acousto-optic modulator outputs the peak of the second waveform.
Thus, the synchronous signal generator controls the switch modulation type acousto-optic modulator to modulate the continuous laser output by the continuous single-frequency laser into pulse laser with a first waveform being a square wave according to the magnitude relation between the clock signal and the pulse width signal; the synchronous signal generator controls the linear modulation type acousto-optic modulator to modulate the pulse laser with the first waveform being the square wave into the pulse laser with the second waveform being the trapezoid-like wave with the rising edge gain smaller than the falling edge gain according to the magnitude relation of the clock signal, the pulse width signal, the rising time signal and the stepping signal, so that the output waveform of the pulse laser can be optimized, the output energy of the pulse laser is improved, and the requirement of the wind measuring radar is met.
Fig. 13 is a schematic structural diagram of a laser wind-finding radar according to an embodiment of the present invention. As shown in fig. 13, the laser wind radar includes a continuous single-
The
Therefore, the laser wind-finding radar provided by the embodiment of the invention adopts the laser output control device provided by the embodiment to optimize the output waveform of the pulse laser and improve the output energy of the pulse laser so as to meet the requirement of the wind-finding radar.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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