阅读说明：本技术 一种基于sql数字化方法的闪烁式手持能谱仪及成谱方法 (Flash type handheld energy spectrometer based on sql digitization method and spectrum forming method ) 是由 邓贞宙 唐庆 于 2020-05-21 设计创作，主要内容包括：本发明提供一种基于sql数字化方法的闪烁式手持能谱仪及成谱方法,其包括外壳以及设置在外壳内的电源管理模块、探测器模块、信号处理模块、微控制器模块和OLED显示模块；所述电源管理模块用于给能谱仪系统的各个模块提供工作电压；所述探测器模块包括闪烁晶体、光导器件、光电倍增管和前置放大电路,利用物质发生电离辐射时,探测电离辐射产生的闪光,将伽马射线转化为电信号,获取连续的脉冲信号；所述信号处理模块用于对经过探测器输出的电信号进行放大和滤波处理；所述微控制器模块将模拟脉冲信号采样实现数据的A/D转换,然后对转换后的数字信号进行处理,再将数据传递给OLED显示模块；所述OLED显示模块,用于显示操作界面和能谱图。(The invention provides a scintillation type handheld energy spectrometer based on an sql digitization method and a spectrum forming method, wherein the scintillation type handheld energy spectrometer comprises a shell, and a power management module, a detector module, a signal processing module, a microcontroller module and an OLED display module which are arranged in the shell; the power supply management module is used for providing working voltage for each module of the energy spectrometer system; the detector module comprises a scintillation crystal, a light guide device, a photomultiplier and a preamplifier circuit, detects flash light generated by ionizing radiation when the ionizing radiation is generated by a substance, converts gamma rays into electric signals and acquires continuous pulse signals; the signal processing module is used for amplifying and filtering the electric signal output by the detector; the microcontroller module samples the analog pulse signal to realize the A/D conversion of the data, processes the converted digital signal and transmits the data to the OLED display module; the OLED display module is used for displaying an operation interface and an energy spectrum diagram.)

1. A scintillation type hand-held energy spectrometer based on an sql digitization method, the scintillation type hand-held energy spectrometer comprising: the device comprises a power management module, a detector module, a signal processing module, a microcontroller module and an OLED display module;

the power management module includes: the device comprises a USB interface, a battery charging circuit, a battery fuel gauge circuit, a rechargeable lithium battery, a 3.3V voltage stabilizing circuit, a 5V voltage stabilizing circuit, a 30.6V booster circuit and a power switch circuit;

the detector module adopts a scintillator detector and comprises a scintillation crystal, a light guide device, a photomultiplier and a preamplifier;

the signal processing module includes: an amplifying circuit and a filter circuit;

the microcontroller module includes: the device comprises a clock module, a key module, a data storage module, an ADC data acquisition module and a main control module;

the OLED display module includes: display driving circuit and OLED display screen.

2. The scintillation hand-held energy spectrometer based on the sql digitization method as recited in claim 1,

the USB interface is a charging interface of the whole energy spectrometer system, the charging plug converts 220V alternating voltage of the mains supply into 5V direct voltage, and then the direct voltage is transmitted to the USB interface through the USB data line to charge the battery; the USB interface can transmit data tested by the energy spectrometer to a user computer through a USB data line;

the battery charging circuit charges the lithium battery with 5V direct current voltage output by the USB interface;

the rechargeable lithium battery adopts a rechargeable lithium battery, and the output voltage is 3.6V to 4.2V;

the battery electricity meter circuit transmits the real-time electric quantity of the battery to the microcontroller module, manages the electric quantity of the battery and realizes the real-time detection of the electric quantity of the battery;

the 3.3V voltage stabilizing circuit converts the 3.6V-4.2V voltage output by the battery into stable 3.3V voltage and provides stable working voltage for each module of the system;

the 5V voltage stabilizing circuit is characterized in that 5V voltage provided by the USB interface is consumed by the charging circuit, so that the voltage is low, and the voltage is stabilized at 5V by the 5V voltage stabilizing circuit to provide input voltage for a subsequent booster circuit;

the starting voltage of the detector module of the 30.6V booster circuit is higher than 30V, and the 30.6V booster circuit provides input for the detector;

the power switch circuit controls the on-off of the whole energy spectrometer system through the operation keys arranged on the shell.

3. The scintillation type hand-held energy spectrometer based on the sql digitization method as claimed in claim 1, wherein the scintillator detector uses ionizing radiation to generate flash light in some substances for detection, photoelectrons form weak unstable electric pulse signals through a photomultiplier, and the electric pulse signals are amplified by a pre-amplification circuit to form stable pulse signals, so that conversion from optical signals to electric signals is realized, and continuous pulse signals are obtained.

4. The scintillation type hand-held energy spectrometer based on the sql digitization method as claimed in claim 1, wherein the amplification circuit amplifies the continuous pulse signals acquired by the detector module, and the amplified continuous pulse signals are filtered by the filter circuit and then transmitted to the microcontroller module.

5. The scintillation hand-held energy spectrometer based on the sql digitization method as recited in claim 1,

the clock module comprises a 32.768KHz low-speed external clock circuit and an 8MHz high-speed external clock circuit;

the clock circuit provides a clock working source for the micro-control module;

the key module controls the updating and the on-off operation of a screen interface through an operation key arranged on the shell;

the data storage module is used for storing data acquired by the scintillation type handheld energy spectrometer based on the sql digitization method and the spectrum forming method into a memory card and recording the data;

the ADC data acquisition module comprises a time sampling module and a voltage threshold module, samples the pulse signal amplified and filtered in the signal processing module to realize A/D conversion of data, processes the converted digital signal and transmits the processed digital signal to the OLED display module;

the main control module can realize the monitoring of the electric quantity of the battery, when the system is about to be closed, the power management module generates a shutdown signal for the main control module of the microcontroller, the main control module receives the shutdown signal and then stores data before shutdown, and then generates a shutdown signal for the power management module, the power module receives the shutdown signal and then shuts down the power, and the system stops working.

6. The scintillation hand-held energy spectrometer based on the sql digitization method as recited in claim 1,

the OLED display module adopts an I2C interface to transmit display data; the OLED display screen is a 1.3-inch OLED12864 display screen, displays an operation interface and an energy spectrum diagram, and can display the current electric quantity.

7. The scintillation type hand-held energy spectrometer based on the sql digitization method as claimed in claim 1, wherein the energy spectrometer can perform online detection anytime and anywhere without connecting ethernet during the measurement process.

8. The scintillation hand-held energy spectrometer based on the sql digitization method as claimed in claim 1, wherein the detector module has a shielding case made of metal to prevent the external electric and magnetic fields from affecting the detector and simultaneously prevent the radiation from the detector when the detector works inside.

9. A method for forming a spectrum based on an sql digitization method is characterized in that the operation steps comprise:

s1: the power management module charges the battery through the USB interface and provides different working voltages for different modules of the energy spectrometer;

s2: the detector module comprises a scintillation crystal, a light guide device, a photomultiplier and a preamplifier, the detector adopts a scintillator detector, the detector realizes the detection of photons by utilizing the fact that ionizing radiation generates flashes in certain substances, and optical signals are converted into electric signals to obtain continuous pulse signals;

s3: the signal processing module comprises an amplifying circuit and a filtering circuit, the continuous pulse signal obtained in the step S2 is amplified through the amplifying circuit, then the amplified signal is filtered through a filter, and then the filtered signal is transmitted to the microcontroller module;

s4: the microcontroller module is mainly used for sampling the pulse signals amplified and filtered in the step S3 to realize A/D conversion of data, processing the converted digital signals and transmitting the processed digital signals to the OLED display module;

s5: the OLED display module comprises a display driving circuit and an OLED display screen, and displays a visual operation interface and an energy spectrum.

10. The spectral method according to claim 9, wherein the method for acquiring the continuous pulse signal comprises: incident radiation is emitted into the scintillation crystal and loses energy in the scintillation crystal to cause ionization and excitation of scintillation atoms, and excited electrons can excite visible light; photons strike a photocathode of a photomultiplier through a light transmission process to generate a photoelectric effect to generate photoelectrons, the photoelectrons are multiplied in the photomultiplier, and finally the electrons enter a signal processing circuit through a positive electrode to form an electric pulse signal of which the pulse amplitude is in direct proportion to the energy of radiation rays.

Technical Field

The invention relates to the field of data measurement, relates to a data measurement instrument, and particularly relates to a scintillation type handheld energy spectrometer based on an sql digitization method and a spectrum forming method.

Background

At present, nuclear technology is rapidly developed and widely applied to various fields such as industrial detection, geological exploration, medical treatment, archaeology and the like; the continued sophistication of nuclear technology is making nuclear technology play an increasingly important role in these areas as well. However, as nuclear technology rapidly develops, the potential threat brought by the nuclear technology is more and more concerned. The gamma energy spectrum analysis is used as a basic method for radiation measurement and is widely applied to occasions such as nuclear radiation detection, nuclide identification and the like. The total amount of gamma radiation can be obtained by measuring gamma rays emitted when the radioactive substance decays, and information such as the element type and the content of the radioactive substance can be obtained according to the analysis of the obtained gamma energy spectrum. The portable energy spectrometer has the characteristics of small volume, convenience in carrying, field use and the like, and can be used for radiation detection in environmental detection and industrial mineral exploitation and also can be used for exploring medical medicament residues. The traditional energy spectrometer is an analog system, has the problems of unstable technology, large size, inconvenience in carrying and high price, and is difficult to popularize in various industries.

Therefore, in order to solve the problems of instability, inconvenience in carrying and high price of the technology, a scintillation type hand-held spectrometer based on an sql digitization method and a spectrum formation method are needed to overcome the defects.

Disclosure of Invention

The invention aims to provide a scintillation type handheld energy spectrometer and a spectrum forming method based on an sql digitization method aiming at the problems of unstable energy spectrometer technology, inconvenient carrying and high price at present.

In order to achieve the purpose, the invention adopts the technical scheme that: providing a scintillation type hand-held energy spectrometer based on an sql digitization method:

including power management module, detector module, signal processing module, microcontroller module, OLED display module, wherein:

the power supply management module is used for providing working voltage for each module of the energy spectrometer system;

the power management module comprises a USB interface, a battery charging circuit, a battery fuel gauge circuit, a rechargeable lithium battery, a 3.3V voltage stabilizing circuit, a 5V voltage stabilizing circuit, a 30.6V boosting circuit and a power switch circuit, wherein the power management module is used for providing working voltage for each module;

the USB interface belongs to the power management module and is a charging interface of the whole system of the energy spectrometer, the charging plug converts 220V alternating voltage of the mains supply into 5V direct voltage, and then the direct voltage is transmitted to the USB interface through the USB data line to charge the battery; the USB interface can transmit data tested by the energy spectrometer to a user computer through a USB data line;

the battery charging circuit is attached to the power management module and charges the lithium battery with 5V direct current voltage output by the USB interface;

the battery electricity meter circuit is subordinate to the power management module, transmits the real-time electric quantity of the battery to the microcontroller module, manages the electric quantity of the battery and realizes the real-time detection of the electric quantity of the battery;

the rechargeable lithium battery belongs to the power management module, adopts a rechargeable lithium battery, and has an output voltage of 3.6V to 4.2V;

the 3.3V voltage stabilizing circuit is attached to the power management module, converts the voltage of 3.6V-4.2V output by the battery into stable 3.3V voltage and provides stable working voltage for each module of the system;

the 5V voltage stabilizing circuit is attached to the power management module, 5V voltage provided by the USB interface generates loss through the charging circuit, so that the voltage is low, and the voltage is stabilized at 5V through the 5V voltage stabilizing circuit to provide input voltage for a subsequent booster circuit;

the 30.6V booster circuit is attached to the power management module, the starting voltage of the detector module is higher than 30V, and the 30.6V booster circuit provides input for the detector module;

and the power switch circuit is subordinate to the power management module, and the whole energy spectrometer system is controlled to be turned on and turned off through the operation keys arranged on the shell.

The detector module is used for detecting the flash light generated by ionizing radiation in certain substances and converting the light signal into an electric pulse signal;

the detector module comprises a scintillation crystal, a light guide device, a photomultiplier and a preamplifier circuit; wherein the detector module transmits the converted electric pulse signals to the signal processing module,

the scintillation crystal is attached to the detector module and used for generating energy loss in the scintillation crystal when incident radiation is shot into the scintillation crystal, so that ionization and excitation of scintillation atoms are caused, and excited electrons emit visible light, wherein the visible light generated in the scintillation crystal is output to the light guide device;

the light guide device is attached to the detector module, is arranged between the scintillation crystal and the photomultiplier, is coupled with the photomultiplier, protects the crystal and is connected with the photomultiplier;

the photomultiplier is attached to the detector module, photons are transmitted by the light guide device and hit on a photocathode of the photomultiplier to generate photoelectric effect to generate photoelectrons, the photoelectrons are multiplied in each multiplication stage of the photomultiplier, and are finally gathered at an anode of the photomultiplier to form an electric pulse signal with pulse amplitude in direct proportion to the energy of the radiation ray, the number of output pulses is in direct proportion to the intensity of the incident radiation ray, and the electric pulse signal generated in the photomultiplier is transmitted to the preamplification circuit;

the pre-amplifying circuit is attached to the detector module and used for amplifying weak and unstable electric pulse signals formed by photoelectrons through the photomultiplier to form relatively stable continuous pulse signals, and the pre-amplifying circuit outputs the relatively stable continuous pulse signals to the signal processing module.

The signal processing module is used for amplifying and filtering the continuous pulse signals transmitted by the detector module;

the signal processing module comprises an amplifying circuit and a filtering circuit, wherein the signal processing module transmits the amplified and filtered signals to the microcontroller module;

the amplifying circuit is attached to the signal processing module and is used for amplifying weak continuous pulse signals transmitted from the detector module, the amplifying circuit adopts an AD8032ARZ chip, the AD8032 can be formed by two integrated operational amplifiers, therefore, the first-stage output is used as the second-stage input in the circuit, meanwhile, the second-stage output is connected to the second-stage inverting input end to be used as feedback, the amplified signals are output from the IOUT2 port, and the amplified signals are output to the filter circuit;

and the filter circuit is subordinate to the signal processing module, carries out filter processing on the amplified signal transmitted by the amplifying circuit, and filters out interference signals which do not meet the requirement of required signals, so that the signals are more stable and have stronger interference resistance, and the filter circuit outputs the signals to the microcontroller module.

The microcontroller module controls the updating and the on-off operation of a screen interface of the spectrometer through an operation key arranged on the shell; storing the data; collecting data to realize A/D conversion of the data; monitoring the electric quantity in real time;

the microcontroller module comprises a clock module, a key module, a data storage module, an ADC data acquisition module and a main control module, and transmits the converted digital signals to the OLED display module;

the clock module is attached to the microcontroller module, comprises a 32.768KHz low-speed external clock circuit and an 8MHz high-speed external clock circuit and provides a clock working source for the microcontroller module;

the key module is subordinate to the microcontroller module and controls the updating and the on-off operation of a screen interface through an operation key arranged on the shell;

the data storage module is attached to the microcontroller module, stores data acquired by the scintillation type hand-held energy spectrometer based on the sql digitization method and the spectrum forming method into a memory card, and records the data;

the ADC data acquisition module comprises a time acquisition module and a voltage threshold module, belongs to the microcontroller module, and is used for sampling the pulse signal amplified and filtered in the signal processing module to realize the A/D conversion of data, processing the converted digital signal and transmitting the processed digital signal to the OLED display module;

the time acquisition module is used for controlling the sampling interval of the voltage threshold module, and the voltage threshold module performs voltage threshold fitting on the analog signal to realize fitting.

The main control module is subordinate to the microcontroller module, and a chip adopted by the main control module is STM32F103C8T6, and meets the required interface and function of the system; the monitoring to battery power can be realized, when the system is about to close, the power management module takes place a shutdown signal for microcontroller's main control module, and main control module receives can be after the shutdown signal with data storage before the shutdown, then takes place a shutdown signal for the power management module, and power module receives close the power behind the shutdown signal, the system stop work.

The OLED display module is used for displaying an operation interface and an energy spectrum diagram;

the OLED display module comprises a display driving circuit and an OLED display screen, and the transmission of display data is carried out by adopting an I2C interface;

the display driving circuit is attached to the OLED display module, and the OLED12864 display screen is provided with an SSD1306 driving chip circuit; the SSD1306 is a single-chip CMOS OLED/PLED driver with a controller, and the display driving circuit is used for driving the display of the LCD display circuit;

the OLED display screen belongs to the OLED display module, adopts a 1.3-inch OLED12864 display screen and is used for displaying an operation interface and an energy spectrum diagram.

According to the technical scheme, the scintillation type energy spectrometer based on the sql digitization method has a simpler operation interface and operation method, can effectively capture gamma photons, and is high in energy accuracy and energy counting rate.

The invention relates to a spectrum forming method based on an sql digitization method, which comprises the following steps:

s1: obtaining working voltages of different working modules of a scintillation type hand-held energy spectrometer based on an sql digitization method, wherein different voltages are obtained after the battery voltage is subjected to voltage reduction and stabilization processing for multiple times through a voltage stabilizing circuit, wherein I is required to be met in each voltage stabilizing circuit module_IN＝I_L+I_GIn which I_INIs the input current of the voltage regulator circuit, I_LIs the output current of the voltage regulator circuit, I_GIs the current flowing to the ground end;

in the DC power supply management module, the voltage provided by the battery is stabilized by voltageThe circuit performs voltage reduction and voltage stabilization for multiple times to obtain multiple voltages, and provides working voltage for each module of the energy spectrometer; wherein each voltage regulator circuit module satisfies I_IN＝I_L+I_GIn which I_INIs the input current of the voltage regulator circuit, I_LIs the output current of the voltage regulator circuit, I_GIs the current flowing to ground.

S2: obtaining a continuous pulse signal S_m，

Where m is the number of scintillation pulses in the continuous pulse signal, S_iIs the ith scintillation pulse; s_mHas an amplitude of E_mFrequency of f_m；

In the detector module, when the ionizing radiation of the gamma ray collides to derive gamma photons, the generated gamma photons are emitted into the scintillation crystal and lose energy in the crystal, so that the scintillation atoms are ionized and excited, and the excited electrons can excite visible light; photons strike a photocathode of a photomultiplier to generate a photoelectric effect to generate photoelectrons, the photoelectrons are multiplied in the photomultiplier, and finally the electrons are output by a positive stage to form a scintillation pulse; a plurality of continuous flash pulses are generated to finally form a continuous pulse signal S_mWhere m is the number of scintillation pulses in the continuous pulse signal, S_iIs the ith scintillation pulse; s_mHas an amplitude of E_mFrequency of f_m。

S3: amplifying the continuous pulse signal, amplifying the signal by an amplifying circuit in the signal regulating module, and adopting an in-phase proportional amplifying circuit to ensure that the input signal and the output signal meet the requirements

Wherein u is_oTo output a signal u_IFor input signal, R_fR is a compensation resistor. Amplification factor of the circuit

Specifically, continuous pulse signals enter an amplifying circuit in a signal regulating module to amplify weak signals into signals with strong anti-interference performance, and meanwhile, the same-proportion amplifying circuit is adopted, so that input signals and output signals meet the requirement of high anti-interference performance

Wherein u is_oTo output a signal u_IFor input signal, R_fR is a compensation resistor. Amplification factor of the circuit

S4: filtering the amplified signal, wherein the generated interference signal is filtered by a second-order active low-pass filter circuit with a cut-off frequency of

Wherein R is₁、R₂Filter resistances in the first and second stages, C, respectively, of the filter circuit₁、C₂The filter capacitors in the first order and the second order of the filter circuit are respectively arranged; the cut-off frequency of the second-order active low-pass filter circuit is determined by a resistor and a capacitor and is related to the bandwidth of the operational amplifier;

s5: performing ADC data sampling on the analog signal obtained after filtering processing to obtain a digital signal, wherein the data sampling satisfies f_s≥2f_mWherein f is_sTo sample frequency, f_mIs the signal frequency of the analog signal; and the digital-to-analog conversion satisfiesIn which N is a decimal digital signal, AV_DDIs a digital reference voltage, S_mIs an analog signal;

the signal forms a stable analog signal after passing through the signal conditioning module, and then is sampled by the ADC data acquisition module to form a digital signal after sampling; the data samples must satisfy f_x≥2f_mTherefore, the phenomenon of pulse accumulation cannot occur; wherein f is_sTo sample frequency, f_mIs the signal frequency of the analog signal;

step S6: the digital signal is input into the microcontroller module, the main controller in the microcontroller module processes the digital signal into data which can be displayed on the OLED display module, and after the processing is finished, the signal is input into the OLED display screen through the transmission line to be displayed.

Compared with the prior art, the invention has the beneficial effects that:

1. compared with the traditional analog energy spectrometer system, the digital processing method has more stable performance;

2. the volume is small, the weight is light, the operation is convenient, and the measurement can be carried out at any time and any place;

3. in the real-time data acquisition process, the anti-interference capacity is strong;

4. the pulse counting device has higher energy resolution to count as many pulses as possible under high counting;

5. the system has low power consumption and can be used for a long time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

FIG. 1 is a schematic structural diagram of an sql-based digital scintillation-type hand-held spectrometer and a spectroscopy method provided by an embodiment of the present invention;

FIG. 2 is a block diagram of the flow of the output of the signal from the detector through the modules based on the sql digitized scintillation type hand-held spectrometer and the spectroscopy method of the present invention.

FIG. 3 is a block diagram of the connection relationship between the modules of the scintillation type hand-held spectrometer based on sql digitization and the spectroscopy method of the invention;

FIG. 4 is a block diagram of the hardware connection of the power management module in the scintillation type hand-held spectrometer based on sql digitization and the spectroscopy method of the invention;

FIG. 5 is a schematic diagram of a detector module in the flash-type hand-held spectrometer and spectroscopy method based on sql digitization according to the present invention;

FIG. 6 is a hardware connection block diagram of a main controller module in a controller module of the flash type hand-held spectrometer and the spectrum forming method based on sql digitization according to the present invention;

FIG. 7 is a model diagram of a scintillation type hand-held spectrometer based on sql digitization according to the invention.

Wherein: 1. photoelectrons; 2. a scintillation crystal; 3. a photomultiplier tube; 4. photoelectrons; 5. simulating a pulse signal; 6. an OLED display screen; 7. an upper housing; 8. operating a key; 9. a lower housing; 10. and a USB interface.

Detailed Description

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The invention discloses a flash type handheld energy spectrometer based on sql digitization and a spectrum forming method, wherein the energy spectrometer adopts a digitization processing method and has stable performance; the energy spectrometer can effectively capture gamma photons, has high energy resolution and can count as many pulses as possible under high counting.

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the protection scope of the present invention is more clearly and clearly defined.

As shown in FIG. 1, the scintillation type hand-held spectrometer based on sql digitization and the spectroscopy method of the invention comprise a power management module 100, a detector module 200, a signal processing module 300, a microcontroller module 400, and an OLED display module 500. Wherein the content of the first and second substances,

the power management module 100 comprises a USB interface 110, a battery charging circuit 120, a battery fuel gauge circuit 130, a rechargeable lithium battery 140, a 3.3V voltage stabilizing circuit 150, a 5V voltage stabilizing circuit 160, a 30.6V boosting circuit 170 and a power switch circuit 180; the power management module 100 provides operating voltages for the various modules of the system.

The detector module 200 includes a scintillation crystal 210, a light guide 220, a photomultiplier 230, and a preamplifier 240; the detector module 200 detects a flash of light generated by ionizing radiation when the ionizing radiation is generated by a substance, converts gamma rays into an electrical signal, and acquires a continuous pulse signal.

The signal processing module 300 includes an amplifying circuit 310 and a filtering circuit 320; the signal processing module 300 is used for amplifying and filtering the electrical signal output by the detector.

The microcontroller module 400 comprises a clock module 410, a key module 420, a data storage module 430, an ADC data acquisition module 440, and a main control module 450, wherein the ADC data acquisition module 440 comprises a time sampling module 441 and a voltage threshold module 442; the microcontroller module 400 samples the analog pulse signal to perform a/D conversion of the data, processes the converted digital signal, and transmits the data to the OLED display module.

An OLED display module 500 including a display driving circuit 510 and an OLED display screen 520; the OLED display module 500 is used to display an operation interface and a power spectrum diagram.

As shown in fig. 1 and fig. 2, a weak and unstable analog pulse signal is generated from the detector module 200, the signal is transmitted to the amplifying circuit 310 in the signal processing module 300, the weak signal is amplified, the amplified signal is output from the amplifying circuit 310 to the filtering circuit 320, and the pulse signal is filtered and shaped to obtain a stable analog pulse signal; the signal processing module 300 transmits the amplified and filtered signal to the microcontroller module 400, samples the analog pulse signal through the ADC data acquisition module 440, performs a/D conversion on the signal, transmits the converted digital signal to the main control module 450, processes the digital signal, and transmits the data to the OLED display module.

As shown in fig. 3 and 4, the power management module 100 charges the rechargeable lithium battery through the USB interface, then manages the power voltage to provide the working voltage for each module of the energy spectrometer system, and the power management module 100 provides the working voltage for the detector module 200, the signal processing module 300, the microcontroller module 400, and the OLED display module. A USB interface 110 for charging the rechargeable lithium battery through a USB data line and charging the output 5V dc voltage to the lithium battery through a battery charging circuit 120; the USB interface can transmit data of the flash type hand-held spectrometer based on sql digitization to a user computer through a USB data line. The battery electricity meter circuit 130 manages the battery electricity quantity and realizes the real-time detection of the battery electricity quantity; the rechargeable lithium battery 140 adopts a rechargeable lithium battery, and the output voltage is 3.6V to 4.2V; the 3.3V voltage stabilizing circuit 150 converts the voltage of 3.6V to 4.2V output by the battery into a stable 3.3V voltage, and provides a stable working voltage for the signal processing module 300, the microcontroller module 400 and the OLED display module 500 of the system. The 5V voltage stabilizing circuit 160 is used for stabilizing the voltage at 5V through the 5V voltage stabilizing circuit to provide input voltage for the 30.6V booster circuit 170; 30.6V booster circuit 170, the starting voltage of the detector module must be higher than 30V, and the 30.6V booster circuit provides input for the detector module; the power switch circuit 180 controls the on/off of the whole energy spectrometer system through operation keys arranged on the shell.

As shown in fig. 1 and 6, the detector module 200 employs a scintillator detector including a scintillation crystal 210, a light guide 220, a photomultiplier tube 230, and a preamplifier 240. The detector module 200 detects using ionizing radiation to produce flashes of light in certain substances; incident radiation is emitted into the scintillation crystal and loses energy in the scintillation crystal to cause ionization and excitation of scintillation atoms, and excited electrons can excite visible light; the photons are transmitted to the photocathode of the photomultiplier through the optical waveguide device to generate photoelectric effect to generate photoelectrons. The photoelectrons are multiplied in the photomultiplier, and finally the electrons enter a signal processing circuit through a positive electrode to form an electric pulse signal with pulse amplitude in direct proportion to the energy of the radiation rays, and the number of the output pulses is in direct proportion to the intensity of the incident radiation rays. The weak unstable electric pulse signal formed by the photoelectrons through the multiplier is amplified by the preamplifier to form a relatively stable analog pulse signal.

As shown in fig. 1, the signal processing module 300 includes an amplifying circuit and a filtering circuit, and amplifies and filters the weak analog pulse signal output by the detector module 200, so that the analog pulse signal is more stable and has stronger anti-interference performance.

As shown in fig. 1 and 6, the micro controller module 400 performs a/D conversion on the analog pulse signal, processes the converted digital signal, and transmits the processed digital signal to the OLED display module 500. The chip adopted by the micro-control module 400 is STM32F103C8T6, and meets the required interfaces and functions of the system; fig. 6 shows a system block diagram of the micro control module, in which the power management module 100 provides a working voltage for an STM32 chip, and the clock module 410 of the micro control module is composed of two 32.768KHz low-speed external clock circuits and an 8MHz high-speed external clock circuit, and provides a clock working source for the micro control module. Analog pulse signals of the detector are adjusted by the signal adjusting circuit and then transmitted to an ADC data acquisition module 440 of the micro-control module for analog-to-digital conversion, the ADC data module 440 comprises a time sampling module 441 and a voltage threshold module 442, the time sampling module 441 is used for controlling the sampling interval of the voltage threshold module 442, and the voltage threshold module 442 is used for performing voltage threshold on the analog signals to realize fitting; the key module 420 mainly controls screen interface updating and on/off operations, and the data storage module 430 is used for storing data measured by the spectrometer and transmitting the data to the user computer through the USB interface. The main control module 450 processes the acquired data and transmits the data to the OLED display module 500 through the I2C interface for display; the main control module 500 also detects the function of the battery, when the system is to be shut down, the power management module sends a shutdown signal to the main control module, the main control module stores the data before shutdown, then sends a shutdown signal to the power module, and finally, the power is turned off, and the whole system stops working.

The OLED display module 500 includes a display driving circuit 510 and an OLED display screen 520, where the analog signal is converted into a digital signal after a/D conversion by the micro control module, and then the digital signal is processed and then the data is sent to the OLED display module for display. Its function is to realize man-machine interface and display energy spectrogram. The display screen of the OLED display module adopts a 1.3-inch OLED12864 display screen, and the OLED12864 display screen is provided with an SSD1306 driving chip circuit; the SSD1306 is a single chip CMOS OLED/PLED driver with controller for organic/polymer light emitting diode dot matrix graphic display system. It consists of 128 segments and 64 commons. The IC is designed for a common cathode type OLED panel. The SSD1306 incorporates contrast control, displays RAM and an oscillator, and can reduce the number of external devices and power consumption. It has 256 levels of brightness control. Data/commands are sent from the general purpose MCU through a hardware selectable 6800/8000 serial compatible parallel interface, I2C interface, or serial peripheral interface.

As shown in fig. 1 and 7, fig. 7 is a flash type hand-held spectrometer prototype model based on sql digitization, the length of the housing of the spectrometer is 11.5cm, the width is 7.5cm, the height is 3cm, wherein 1 is a 1.3 inch OLED12864 display screen for displaying an operation interface and a spectrum diagram; 2, an upper shell of the energy spectrometer is used for protecting a circuit of the energy spectrometer and playing a role in shielding; 3, operating the spectrometer by using an operating key; 4, the lower shell of the energy spectrometer is used for supporting the circuit of the energy spectrometer and playing a role in shielding; and 5, a USB interface is used for charging the energy spectrometer system and simultaneously transmitting the stored data to a user computer through a USB data line.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.