阅读说明：本技术 一种高稳定性可连续长时间出光的机载激光测照器 (High-stability airborne laser illuminator capable of continuously emitting light for long time ) 是由 吴权 李磊 冯新 赵玉倩 李小青 张洪流 王能东 崔家珮 王能礼 于 2020-03-20 设计创作，主要内容包括：一种高稳定性可连续长时间出光的机载激光测照器包括：发射光学系统、接收光学系统、电源组件、热控组件、控制组件、出光探测器、回光探测模块和激光器；激光器提供激光测距和目标指示所需的光源；电源组件为机载激光测照器供电；发射光学系统将激光扩束准直到束散角典型值发射出去；接收光学系统收集从目标反射回来的回光信号,使回光信号高质量成像会聚在后端出光探测器的APD的感光面；出光探测器通过探测输出激光的漫反射光触发控制电路开始计时,回光探测模块包括雪崩二极管APD和光电信号处理电路板,用于探测由接收光学系统会聚在APD感光面上的回光信号,经过光电信号转换后,触发控制电路停止计时,借助控制组件通过换算实现测距。(An airborne laser illuminator with high stability and capability of continuously emitting light for a long time comprises: the device comprises a transmitting optical system, a receiving optical system, a power supply assembly, a thermal control assembly, a light-emitting detector, a light-returning detection module and a laser; the laser provides a light source required by laser ranging and target indication; the power supply assembly supplies power to the airborne laser illuminator; the transmitting optical system expands and collimates the laser beam to a beam divergence angle typical value and transmits the beam divergence angle typical value; the receiving optical system collects the return light signals reflected from the target, so that the high-quality images of the return light signals are converged on the photosensitive surface of the APD (avalanche photo diode) of the rear-end light-emitting detector; the light-emitting detector triggers the control circuit to start timing by detecting diffuse reflection light of output laser, the return light detection module comprises an Avalanche Photo Diode (APD) and a photoelectric signal processing circuit board and is used for detecting return light signals converged on a photosensitive surface of the APD by the receiving optical system, the control circuit is triggered to stop timing after photoelectric signal conversion, and distance measurement is realized by conversion through the control assembly.)

1. The utility model provides a but machine of high stability continuous long time light-emitting carries laser illuminator which characterized in that includes: the device comprises a transmitting optical system, a receiving optical system, a power supply assembly, a thermal control assembly, a light-emitting detector, a light-returning detection module and a laser; the laser provides a light source required by laser ranging and target indication; the power supply assembly supplies power to the airborne laser illuminator; the transmitting optical system expands and collimates the laser beam to a beam divergence angle typical value and transmits the beam divergence angle typical value; the receiving optical system collects the return light signals reflected from the target, so that the high-quality images of the return light signals are converged on the photosensitive surface of the APD (avalanche photo diode) of the rear-end light-emitting detector; the light-emitting detector triggers the control circuit to start timing by detecting diffuse reflection light of output laser, the return light detection module comprises an Avalanche Photo Diode (APD) and a photoelectric signal processing circuit board and is used for detecting return light signals converged on a photosensitive surface of the APD by the receiving optical system, the control circuit is triggered to stop timing after photoelectric signal conversion, and distance measurement is realized by conversion through the control component; the thermal control assembly is used for heat dissipation.

2. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1, wherein the laser comprises: the device comprises an output mirror, an LD pumping module, a polarizer, a pyramid prism, an 1/4 wave plate, a Q-switched crystal, a wedge-shaped mirror pair, a total reflection mirror, a high-voltage power supply module and an extraluminal wedge-shaped mirror group; the output mirror and the total reflection mirror form a cavity mirror of the resonant cavity and are used for realizing the oscillation of laser in the cavity; the LD side pump module comprises an LD target bar array, Nd, YAG crystal bars and heat sinks which are used as working substances and pumping sources for generating laser; the polarizer is used for generating linear polarization light; the pyramid prism is used for reflecting the laser in the cavity; 1/4 wave plate is used to generate pi/2 phase delay for linear polarization, so as to cooperate with the opening and closing of Q switch in high-voltage control cavity; the Q-switched crystal is used for changing the polarization characteristic of linear polarization in the cavity; the high-voltage power supply module is used for providing 1/4 wave voltage for the Q-switched crystal; the wedge-shaped mirror pair consists of a pair of wedge-shaped mirrors and is used for debugging the light path in the cavity; light output by an output mirror of the laser enters the emission optical system after passing through the wedge-shaped mirror group outside the cavity; the wedge-shaped lens group outside the cavity is used for fine-tuning the laser direction emitted by the laser, so that the laser emitting direction and the emission optical system keep the consistency of optical axes.

3. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1 or 2, characterized in that the thermal control assembly is composed of heat dissipation fins and semiconductor refrigeration pieces, the semiconductor refrigeration pieces are arranged at the bottoms of the heat dissipation fins, the hot end is welded with the heat dissipation plate, the cold end is tightly attached to the laser, and the semiconductor refrigeration pieces conduct waste heat generated by the laser to the hot end after being electrified and conduct the waste heat to the heat dissipation fins from the hot end.

4. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1 or 2, characterized in that the control component is used for realizing the following functions: communicating with the power supply assembly to control and monitor the LD driving current, the driving current of the semiconductor refrigeration chip of the thermal control assembly and the fan working voltage; controlling the light emitting frequency of the laser; monitoring the surface temperature of an LD pumping module of a power supply assembly, the hot end temperature of a semiconductor refrigerating sheet of a thermal control assembly and the ambient temperature; judging the working states of the temperature control power supply current and the current of the LD pumping module; detecting the time difference between the light pulse and the return light pulse, and calculating the distance measurement distance; communicating with a user to realize external triggering; controlling the high voltage and the working temperature of the avalanche diode; carrying out threshold detection on the return light signal; and the system is communicated with an upper computer, so that the system is convenient to debug.

5. The high-stability airborne laser illuminator capable of continuously emitting light for a long time according to claim 1 or 2, characterized in that the overall structure of the airborne laser illuminator is divided into an upper structure and a lower structure, wherein the upper structure comprises: the power supply assembly, the thermal control assembly and the control assembly; the lower structure comprises a transmitting optical system, a receiving optical system, a light-emitting detector, a light-returning detection APD module and a laser.

6. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1 or 2, wherein the power supply component, the control component, the photoelectric detection component, the laser, the emission optical component, the receiving optical component and the heat dissipation component are designed and integrated into a whole.

7. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1 or 2, characterized in that all components of the whole laser illuminator are all arranged on the outer frame of the structure.

8. The high-stability airborne laser illuminator capable of emitting light continuously for a long time according to claim 1 or 2, wherein the working mode of the laser illuminator comprises a start-up mode, a standby mode, a distance measuring mode and a laser irradiation mode; the laser illuminator enters a starting mode when being powered on, the laser illuminator executes power-on self-detection, precools or preheats, and then enters a standby mode; in the standby mode, the laser maintains a temperature control state and is in a waiting state; in the standby mode or the irradiation mode, the laser irradiation device is converted into the distance measurement mode after receiving the distance measurement command so as to execute the distance measurement operation; in the standby mode or the irradiation mode, the laser detector is changed into the irradiation mode to perform the irradiation operation after receiving the irradiation instruction.

Technical Field

The invention relates to the field of laser technology application, in particular to a laser illuminator for realizing laser ranging and target indication functions in a laser-made airborne photoelectric pod.

Background

The laser illuminator is an important component of a laser semi-active seeking guidance system, is used for realizing laser ranging, and simultaneously emits laser beams to a target to indicate the target for a guided weapon.

In the aspect of stability, in the laser guidance process, when the target is irradiated by the laser measuring and irradiating device, the indication tracking of the target is directly influenced by the stability of laser energy, the stability of a laser optical axis and the accuracy of laser light emitting time, so that the stability of the laser device is important for improving the laser guidance. On the other hand, when the photoelectric pod or the seeker with the laser illuminator flies randomly, severe vibration is formed between the photoelectric pod or the seeker and the atmosphere in the process of high-speed movement, so that the emitting optical axis of the laser illuminator shakes to a certain extent, the whole laser illuminator is required to have high enough vibration resistance to ensure that the working performance of the whole laser illuminator does not change along with environmental vibration, and the laser emitting optical axis and the mechanical axis of the fixed base are required to be consistent as much as possible, so the design of the vibration resistance of the whole laser illuminator is also an important engineering problem.

In the aspect of working time, for some application scenes needing to continuously track the target, whether the airborne laser illuminator can continuously work for a long time or not directly determines whether the whole airborne system can continuously fight or not, so that the continuous working time of the laser illuminator has important significance for practical application.

Based on the above principle and analysis, stability and long-term continuous operation are two important index requirements for airborne equipment. Firstly, for a typical laser lighting device capable of realizing distance measurement and distance measurement in a range of 300-20 km and target indication of 10km, the existing domestic products are usually designed by separating an electric control component such as a laser driving power supply or a measurement and control component from an optical component such as a laser or an optical system, which is not favorable for high integration of airborne equipment, and the stability of the laser lighting device still has a space for improving. On the other hand, the traditional laser illuminator products in China can only carry out target illumination according to the working modes of a plurality of circulative light emitting (typically 90s light emitting, 60s rest and 4 circulations), and under some combat platforms needing long-time continuous work, the traditional laser illuminator products can not meet the actual requirements.

Therefore, when the laser illuminator is poor in stability or cannot work continuously for a long time, potential risks are caused to the laser guidance process, and the distance measurement and tracking functions of the target are directly influenced when the laser illuminator is serious.

Disclosure of Invention

The invention aims to solve the technical problem that the defects exist in the prior art, and provides an airborne laser illuminator which is high in stability and can continuously emit light for a long time, wherein a laser pulse method is adopted to realize laser ranging, and the laser adopts LD pumping Nd-YAG crystal and electro-optic Q-switching technology to realize output of 1064nm pulse laser, for example, and can be used for illuminating and indicating a target.

According to the present invention, there is provided an onboard laser illuminator with high stability and capable of emitting light continuously for a long time, comprising: the device comprises a transmitting optical system, a receiving optical system, a power supply assembly, a thermal control assembly, a light-emitting detector, a light-returning detection module and a laser; the laser provides a light source required by laser ranging and target indication; the power supply assembly supplies power to the airborne laser illuminator; the emission optical system is used for expanding and collimating the laser to a beam divergence angle typical value and emitting the laser; the receiving optical system collects the return light signals reflected from the target, so that the high-quality images of the return light signals are converged on the photosensitive surface of the APD (avalanche photo diode) of the rear-end light-emitting detector; the light-emitting detector triggers the control circuit to start timing by detecting diffuse reflection light of the output laser; the return light detection module comprises an Avalanche Photo Diode (APD) and a photoelectric signal processing circuit board and is used for detecting return light signals converged on a photosensitive surface of the APD by a receiving optical system, triggering the control circuit to stop timing after photoelectric signal conversion, and realizing ranging by conversion through the control assembly; the thermal control assembly is used for heat dissipation.

Preferably, the laser comprises: the device comprises an output mirror, an LD pumping module, a polarizer, a pyramid prism, an 1/4 wave plate, a Q-switched crystal, a wedge-shaped mirror pair, a total reflection mirror, a high-voltage power supply module and an extraluminal wedge-shaped mirror group; the output mirror and the total reflection mirror form a cavity mirror of the resonant cavity and are used for realizing the oscillation of laser in the cavity; the LD side pump module comprises an LD target bar array, Nd, YAG crystal bars and heat sinks which are used as working substances and pumping sources for generating laser; the polarizer is used for generating linear polarization light; the pyramid prism is used for reflecting the laser in the cavity; 1/4 wave plate is used to generate pi/2 phase delay for linear polarization, so as to cooperate with the opening and closing of Q switch in high-voltage control cavity; the Q-switched crystal is used for changing the polarization characteristic of linear polarization in the cavity; the high-voltage power supply module is used for providing 1/4 wave voltage for the Q-switched crystal; the wedge-shaped mirror pair consists of a pair of wedge-shaped mirrors and is used for debugging the light path in the cavity; light output by an output mirror of the laser enters the emission optical system after passing through the wedge-shaped mirror group outside the cavity; the wedge-shaped lens group outside the cavity is used for fine-tuning the laser direction emitted by the laser, so that the laser emitting direction and the emission optical system keep the consistency of optical axes.

Preferably, the thermal control assembly is composed of radiating fins and semiconductor refrigerating pieces, the semiconductor refrigerating pieces are arranged at the bottoms of the radiating fins, the hot ends of the semiconductor refrigerating pieces are welded with the radiating plates, the cold ends of the semiconductor refrigerating pieces are attached to the laser, and after the semiconductor refrigerating pieces are electrified, waste heat generated by the laser is conducted to the hot ends of the semiconductor refrigerating pieces and conducted to the radiating fins through the hot ends.

Preferably, the control assembly is adapted to perform the following functions: communicating with the power supply assembly to control and monitor the LD driving current, the driving current of the semiconductor refrigeration chip of the thermal control assembly and the fan working voltage; controlling the light emitting frequency of the laser; monitoring the surface temperature of an LD pumping module of a power supply assembly, the hot end temperature of a semiconductor refrigerating sheet of a thermal control assembly and the ambient temperature; judging the working states of the temperature control power supply current and the current of the LD pumping module; detecting the time difference between the light pulse and the return light pulse, and calculating the distance measurement distance; communicating with a user to realize external triggering; controlling the high voltage and the working temperature of the avalanche diode; carrying out threshold detection on the return light signal; and the system is communicated with an upper computer, so that the system is convenient to debug.

Preferably, the complete machine structure of airborne laser illuminator divide into top structure and below structure, and wherein the top structure contains: the power supply assembly, the thermal control assembly and the control assembly; the lower structure comprises a transmitting optical system, a receiving optical system, a light-emitting detector, a light-returning detection APD module and a laser.

Preferably, the power supply assembly, the control assembly, the photodetection assembly, the laser, the emission optical assembly, the reception optical assembly and the heat dissipation assembly are designed and integrated.

Preferably, all components of the whole laser measuring and lighting device are arranged on the structural outer frame.

Preferably, the working mode of the laser detector comprises a starting mode, a standby mode, a distance measuring mode and a laser irradiation mode; the laser illuminator enters a starting mode when being powered on, the laser illuminator executes power-on self-detection, precools or preheats, and then enters a standby mode; in the standby mode, the laser maintains a temperature control state and is in a waiting state; in the standby mode or the irradiation mode, the laser irradiation device is converted into the distance measurement mode after receiving the distance measurement command so as to execute the distance measurement operation; in the standby mode or the irradiation mode, the laser detector is changed into the irradiation mode to perform the irradiation operation after receiving the irradiation instruction.

The technical effects of the invention at least comprise:

first, the laser operates stably. The laser pumping source adopts an LD side pump module, the LDs in the LD side pump module are arranged into an annular array and surround the Nd-YAG crystal bar, so that pumping light is uniformly distributed, and the LD is fixed on the heat sink. Compared with the conventional end pump mode, the pump light fiber and the optical coupling system are omitted, the size is reduced, and the stability is improved. In the resonant cavity design, a U-shaped folding cavity is adopted, the pyramid prism is introduced to serve as an optical path reflecting element in the cavity, and linear polarization oscillation is realized in the cavity by designing the polarizer and the pyramid prism to opposite positions, so that the detuning property of the laser is greatly improved, and the stability of the laser is also a key technology for ensuring. On the aspect of realizing pulse laser output, an electro-optical Q-switching technical principle is utilized, a lithium niobate crystal is adopted as a Q-switching crystal, the aspect ratio of the Q-switching crystal is reasonably designed, so that the Q-switching high voltage can stably work at high and low temperatures, and a Q-switching high voltage module is arranged in a laser, so that the Q-switching high voltage module can be protected from interfering with an external power supply component.

Second, light can be emitted continuously for a long time. The radiator in the thermal control system is designed based on waste heat of the laser, the number of radiating fins is increased to increase the radiating area under the condition of limited size, the radiator is made of copper materials and has high heat transfer speed, and an aviation fan with high rotating speed and high air volume is adopted, so that the heat in the laser can be quickly extracted out at high temperature, the laser can maintain constant temperature light emission within the temperature range of minus 40-60 ℃, and the long-time continuous work of the whole machine is ensured.

Thirdly, the photoelectric performance of the whole machine is stable and reliable. The whole structure frame adopts the integral type design, distributes the installation interface of each subsystem on same frame for each module can nimble dismouting, and the frame wall thickness adopts the strengthening rib design, has compromise complete machine weight and anti-vibration impact performance, and each direct integrated the installation of device in the laser intracavity is in this structure frame, is favorable to improving laser stability. The vibration environment with the acceleration of 7g under the random vibration spectrum and the peak acceleration of 15g under the half sine wave impact waveform can be tolerated.

Drawings

A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:

fig. 1 schematically shows a front view of a high stability airborne laser illuminator that can emit light for a long time, according to a preferred embodiment of the present invention.

Fig. 2 schematically shows a side view of a high stability airborne laser illuminator that can emit light for a long time duration, according to a preferred embodiment of the present invention.

Fig. 3 schematically shows a laser composition diagram of a high-stability airborne laser illuminator capable of continuously emitting light for a long time according to a preferred embodiment of the invention.

Fig. 4 is a schematic diagram of the outline of the structure of the high-stability airborne laser illuminator capable of continuously emitting light for a long time according to the preferred embodiment of the invention.

It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.

Detailed Description

In order that the present disclosure may be more clearly and readily understood, reference will now be made in detail to the present disclosure as illustrated in the accompanying drawings.

Fig. 1 schematically shows a front view of a high-stability long-time-light-emission onboard laser illuminator according to a preferred embodiment of the present invention, and fig. 2 schematically shows a side view of the high-stability long-time-light-emission onboard laser illuminator according to the preferred embodiment of the present invention.

As shown in fig. 1 and 2, the high-stability airborne laser illuminator capable of emitting light continuously for a long time according to the preferred embodiment of the present invention includes: the device comprises a transmitting optical system 1, a receiving optical system 2, a power supply component 3, a thermal control component 4, a control component 5, a light-emitting detector 6, a light-returning detection module 7 and a laser 8.

The laser 8 is a core component of the whole laser measuring and lighting device and provides a light source required by laser ranging and target indication.

Power supply module 3 is the power supply of airborne laser illumination ware, provides each power supply demand of branch system, includes: providing voltage and current required by normal operation for an LD pumping module in the laser; voltage and current are provided for the control panel and the APD assembly, and stable work of the control and return light detection part is ensured; providing necessary voltage and current for the TEC to ensure the constant temperature of the LD pumping module; the voltage and current required by the work are provided for the fan, and the fan is ensured to quickly lead out the heat accumulated on the heat sink.

The emitting optical system 1 is used for expanding and collimating the laser light to a small beam divergence angle (typically 0.3mrad) and emitting the laser light.

The receiving optical system 2 is used for collecting the return light signal reflected from the target, for example, by optimizing the lens design and placing a 1064nm narrow-band filter with a high cut-off depth at the rear end of the lens, so that the return light signal is focused on the photosensitive surface of the APD of the rear-end light-emitting detector in a high-quality image. The light-emitting detector 6 triggers the control circuit to start timing by detecting diffuse reflection light of the output laser.

The return light detection module 7 comprises an Avalanche Photodiode (APD) and a photoelectric signal processing circuit board, and is used for detecting return light signals converged on a photosensitive surface of the APD by a receiving optical system, triggering a control circuit to stop timing after photoelectric signal conversion, namely completing the timing of the flight time of laser, and realizing ranging by conversion through the control component 4.

The thermal control assembly 4 is used for heat dissipation. Specifically, for example, the thermal control assembly 4 is composed of a heat dissipation fin and a semiconductor refrigeration sheet TEC, the semiconductor refrigeration sheet TEC is disposed at the bottom of the heat dissipation fin, the hot end of the semiconductor refrigeration sheet TEC is welded to the heat dissipation plate, the cold end of the semiconductor refrigeration sheet TEC is attached to the laser, waste heat generated by the laser can be conducted to the hot end after the TEC is powered on, the waste heat is conducted to the heat dissipation fin from the hot end, at the moment, the fan starts to work according to the temperature detected by the hot end, heat on the heat dissipation fin is timely extracted and discharged, and the laser is maintained at. The design of the radiator is designed by carrying out analog simulation on waste heat generated by the laser and combining a large number of temperature control high-low temperature tests for searching and adjusting, in order to accelerate heat transfer, the radiating fins are made of copper materials with higher thermal conductivity coefficients, but the radiating bottom plate is still made of aluminum materials in consideration of weight control, and the requirements of heat radiation and temperature control can be met through the high-low temperature test of the whole machine. In addition, the thermal control system adopts the aviation fan with high rotating speed and high air volume, and can instantaneously extract residual heat in the radiating fins, so that the laser can still maintain constant temperature operation at the high temperature of 60 ℃, and can continuously emit light for 10min at the high temperature and for more than 1h at the normal temperature.

Also, for example, the control assembly 5 is mainly used to implement the following functions:

(a) communicating with a power supply assembly, and controlling and monitoring LD driving current, TEC driving current and fan working voltage;

(b) controlling the light emitting frequency of the laser;

(c) monitoring the surface temperature of an LD module, the temperature of the hot end of the TEC and the ambient temperature;

(d) judging the working states of the temperature control power supply current and the LD current;

(e) detecting the time difference between the light pulse and the return light pulse, and calculating the distance measurement distance;

(f) communicating with a user to realize external triggering;

(g) communicating with the APD to control the APD high voltage and the working temperature;

(h) carrying out threshold detection on the return light signal;

(i) and the system is communicated with an upper computer, so that the system is convenient to debug.

Preferably, as shown in fig. 3, the laser 8 comprises: the device comprises an output mirror 9, an LD pumping module 10, a polarizer 11, a pyramid prism 12, an 1/4 wave plate 13, a Q-switched crystal 14, a wedge-shaped mirror pair 15, a total reflection mirror 16, a high-voltage power supply module 17 and a wedge-shaped mirror group 18. The laser 8 passes through the output mirror 9 and then through another set of wedge mirrors 18 into the emission optical system 1. In the laser 8, an output mirror 9 and a total reflection mirror 16 form a cavity mirror of a resonant cavity, and are used for realizing the oscillation of laser in the cavity and generating 1064nm output through film coating and mode competition mode selection; the LD side pump module 10 is internally composed of an LD target bar array, Nd, YAG crystal bars and heat sinks, and is used as a working substance and a pumping source for generating laser; the polarizer 11 is a lens placed at brewster's angle for generating linearly polarized light; the pyramid prism 12 is used for reflecting the laser in the cavity, can ensure the consistency of the optical axes of the two support arms, and can improve the stability of the laser when being arranged on a special tool; 1/4 wave plate 13 is used to generate pi/2 phase delay for linear polarization, so as to cooperate with the opening and closing of Q switch in high-voltage control cavity; the Q-switched crystal 14 is used for changing the polarization characteristic of the linear polarization light in the cavity; the high-voltage power supply module 17 is used for providing 1/4 wave voltage for the Q-switched crystal; the wedge-shaped mirror pair 15 is composed of a pair of wedge-shaped mirrors, is used for debugging the optical path in the cavity, and is an important device in laser debugging. The entire laser 8 passes through the output mirror 9 and then through another set of wedge optics 18 into the emission optical system 1. The wedge-shaped mirror 18 outside the cavity is used for fine-tuning the laser emitting direction of the laser, so that the laser emitting direction and the emitting optical system keep the consistency of the optical axis.

Preferably, as shown in fig. 4, all the components of the laser camera complete machine of the present invention are all mounted on the structural outer frame 19, so that the complete machine is compact.

Preferably, but the complete machine structure of the airborne laser illuminator of high stability continuous long-time light-emitting is divided into top structure and below structure, and wherein the top structure contains: a power supply module 3, a thermal control module 4, and a control module 5; the lower structure comprises a transmitting optical system 1, a receiving optical system 2, a light-emitting detector 6, a light-returning detection APD module 7 and a laser 8.

In a specific example, the whole machine adopts a modularized design, a power supply component, a control component, a photoelectric detection component, a laser, a transmitting optical component, a receiving optical component and a heat dissipation component are designed and integrated into a whole, the photoelectric detection component has the characteristics of high vibration resistance and high stability, the vibration magnitude can reach 7g under a random vibration spectrum, the peak acceleration of a half sine wave waveform can reach 15g, continuous light emitting is realized for more than 1h at normal temperature, continuous light emitting is realized for more than 10min at a limit temperature of 60 ℃, and the photoelectric detection component can be applied to realizing the technical indexes of distance measurement and target indication within the range of 300-20 km under the condition that the target volume is 2.3m multiplied by 6.2 m.

The laser illuminator of the invention adopts the pulse mode to measure the distance, namely a pulse laser that is emergent by the laser, trigger the photodetector, the counter in the control system begins to work and time at this moment, this pulse laser is irradiated to the measured target after the beam expanding collimation of the transmitting optical system, the return light signal formed by its surface diffuse reflection is focused on APD detector through the receiving optical system, the detector turns into the electrical signal after detecting the optical signal, trigger the counter to stop working, through counting the number of pulse produced by the internal circuit of the counter, can measure the time (namely flight time method) that the laser comes and goes, obtain the target distance after converting, thus realize the function of distance measurement.

In the specific embodiment, the laser irradiation device is designed with 4 working modes, such as a start mode, a standby mode, a distance measurement mode, a laser irradiation mode, and the like.

1) Starting a mode: and in the power-on starting stage, the laser illuminator completes power-on self-test, and precools (or preheats) the main laser component to make the main laser component reach the temperature required by normal work. The time required for the start-up phase is related to the ambient temperature. The start-up time does not exceed 1 minute at ambient temperature of 25 ℃. The start-up time does not exceed 3 minutes at a limiting ambient temperature of-40 ℃ or +60 ℃. After preheating (or precooling) is completed, the laser enters a standby mode.

2) Standby mode: in the standby mode, the laser maintains a temperature control state and is in a state of waiting for distance measurement/irradiation.

3) A distance measurement mode: in the standby mode (or irradiation mode), the laser detector is switched to the distance measurement mode after receiving the distance measurement command. The laser emits light at 5Hz (or other frequencies), and the ranging signal detection system receives a reflected signal of the target to the laser to acquire distance information. In the ranging mode, the frequency of reported ranging data is 5Hz (or other frequencies).

4) Laser irradiation mode: in the standby mode (or the distance measuring mode), after receiving an irradiation instruction, the laser detector is converted into the irradiation mode, and the laser immediately encodes light according to the preset frequency and simultaneously gives distance information.

The invention has at least the following advantages:

1) each subsystem of the whole machine adopts a modular design and is integrated on the same supporting piece, so that the whole machine has a compact structure and high reliability;

2) the laser resonant cavity adopts a U-shaped cavity, and the introduction pyramid prism is used as an optical path reflection element in the cavity, so that the detuning property of the laser is greatly improved, an LD side pump module is used as a pumping source, the output of pulse laser is realized by combining an electro-optical Q-switching technology, the laser energy stability is high, the stability of a laser emission optical axis is high, and the laser light-emitting time is accurate and controllable;

3) the thermal control assembly adopts a TEC refrigeration technology with a special structure, a radiator for efficient refrigeration is designed according to waste heat generated by the laser, an aviation fan is adopted to pump the waste heat generated by the laser out of the whole machine, and the whole machine is maintained to work at a constant temperature;

4) the whole structure frame adopts the integral type design, distributes the installation interface of each subsystem on same frame for each module can nimble dismouting, and the frame wall thickness adopts the strengthening rib design, has compromise complete machine weight and anti-vibration impact performance, and each direct integrated the installation of device in the laser intracavity is in this structure frame, is favorable to improving laser stability.

It should be noted that the terms "first", "second", "third", and the like in the description are used for distinguishing various components, elements, steps, and the like in the description, and are not used for indicating a logical relationship or a sequential relationship between the various components, elements, steps, and the like, unless otherwise specified.

It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.