A reference-level dosimeter detection signal processing system

Abstract

This application discloses a reference-grade dosimeter detection signal processing system, including a signal acquisition module, a signal processing module, a display and interaction module, and a communication interface module. The signal processing module, by introducing a multi-range amplification control unit, automatically or manually switches circuit amplification parameters according to the amplitude range of the input signal, achieving accurate measurement across the entire range. This effectively avoids signal saturation and low signal-to-noise ratio problems, significantly improving measurement accuracy and reliability. The signal shaping unit shapes the amplified signal, reducing abrupt noise and filtering out minute noise signals below a threshold, making the useful signal more prominent. Simultaneously, the noise suppression unit employs a two-stage filtering circuit to further eliminate environmental noise and low-frequency interference in the signal, improving signal quality. This effectively solves the limitations of existing dosimeters in signal processing, improving the accuracy and reliability of radiation dose measurement.

Description

Technical Field

[0001] The invention relates to the technical field of reference-level dosimeters, and in particular to a reference-level dosimeter detection signal processing system. Background Art

[0002] Reference-level dosimeters are mainly used for reading weak ionization signals from standard ionization chambers (therapeutic horizontal ionization chambers, well-type ionization chambers, etc.). They meet the requirements of IEC60731 reference-level technical indicators and can form a measurement standard together with standard ionization chambers.

[0003] Since the ionization effect produced by the interaction between radiation particles and detector materials is often very weak, especially in low-dose rate environments, these weak electrical signals are easily affected by multiple factors such as background noise, electronic noise, and electromagnetic interference, resulting in reduced signal quality and limited measurement accuracy. In addition, existing dosimeters often use fixed-gain amplifier circuits, which cannot automatically adapt to input signals of different amplitudes, resulting in signal saturation at high dose rates and low signal-to-noise ratio at low dose rates, making it impossible to achieve accurate measurement of the full range. For example, the Chinese invention patent with application number 2023101969172 discloses a radiation dosimeter. In the process of collecting radiation data, the collection components of the application include a channel switcher, multiple amplifiers, and an A / D converter. The amplifier of this technical solution uses a fixed gain and cannot effectively adapt to input signals of different amplitudes. At high dose rates, the signal may be distorted due to amplifier saturation; at low dose rates, the signal-to-noise ratio may be too low, affecting the measurement accuracy.

[0004] In summary, the limitations of existing dosimeters in signal processing seriously restrict the accuracy and reliability of radiation dose measurement. In view of the above situation, the present invention aims to provide a new solution to solve this problem. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the present invention is to provide a reference-level dosimeter detection signal processing system.

[0006] The technical solution is: a reference-level dosimeter detection signal processing system, including:

[0007] Signal acquisition module, used to detect radiation particles in the standard ionization chamber and convert them into electrical signal output;

[0008] The signal processing module is used to process and analyze the electrical signal output by the signal acquisition module, specifically including:

[0009] A multi-range amplification control unit automatically or manually switches circuit amplification parameters according to the amplitude range of the electrical signal to match the measurement range that can be identified by the system;

[0010] A signal shaping unit, arranged at the output end of the multi-range amplification control unit, for shaping the amplified signal;

[0011] A noise suppression unit, arranged at the output end of the signal shaping unit, for eliminating environmental noise and low-frequency interference in the signal;

[0012] an analog-to-digital converter, disposed at the output end of the noise suppression unit, for converting the processed analog electrical signal into a digital signal; and

[0013] A microprocessor, used for analyzing and calculating the digital signal to determine the radiation dose;

[0014] A display and interaction module, connected to the microprocessor, for displaying system status and measurement results, and allowing the user to perform operations and parameter settings;

[0015] Communication interface module, used for data exchange with external devices.

[0016] Preferably, the signal acquisition module includes:

[0017] A detection probe, disposed in the standard ionization chamber, for converting the ionization effect generated by the interaction between the detection radiation particles and the substances in the ionization chamber into a measurable electrical signal;

[0018] The signal connector is used to transmit the electrical signal to the signal processing module.

[0019] Preferably, the multi-range amplification control unit comprises:

[0020] A main amplifying circuit, comprising an op amp U1, wherein a non-inverting input terminal of the op amp U1 is connected to a resistor R1 and one end of a capacitor C1 through a resistor R2, the other end of the capacitor C1 is connected to a signal output terminal of the signal acquisition module, and the other end of the resistor R1 is grounded;

[0021] The gain control circuit includes a field effect transistor Q1, the drain of the field effect transistor Q1 is connected to one end of a resistor R3 and an inverting input end of an operational amplifier U1, the other end of the resistor R3 is connected to the output end of the operational amplifier U1 and one end of a resistor R4 through a capacitor C2, the other end of the resistor R4 is connected to one end of a resistor R5 and a gate of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded, the other end of the resistor R5 is connected to the cathode of a voltage-stabilizing diode DZ1, one end of the capacitor C3 and a first control output end of the microprocessor, and the anode of the voltage-stabilizing diode DZ1 and the other end of the capacitor C3 are grounded.

[0022] Preferably, the signal shaping unit comprises:

[0023] An operational amplifier U2, wherein the inverting input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U1 through a resistor R6;

[0024] An integral regulating circuit includes a capacitor C4, a capacitor C5, a capacitor C6, a resistor R7 and a resistor R8, wherein one end of the resistor R8 and the capacitor C6 is connected to the resistor R7 and the inverting input end of the operational amplifier U2 through the capacitor C5, the other end of the resistor R8 and the capacitor C6 is connected to the output end of the operational amplifier U2, and the other end of the resistor R7 is grounded through the capacitor C4;

[0025] The threshold circuit is arranged at the non-inverting input terminal of the operational amplifier U2, and is used for providing a threshold voltage to the operational amplifier U2.

[0026] Preferably, the threshold circuit includes a transistor VT1, the collector of the transistor VT1 is connected to the in-phase input terminal of the operational amplifier U2 and is grounded through a capacitor C7, the emitter of the transistor VT1 is connected to one end of the resistor R9 and the input terminal of the three-terminal regulator D1 through a resistor R10, the other end of the resistor R9 is connected to a +5V power supply, the base of the transistor VT1 is connected to one end of the resistor R11 and the output terminal of the three-terminal regulator D1, and the other end of the resistor R11 is grounded.

[0027] Preferably, the noise suppression unit comprises:

[0028] A first filtering circuit, for eliminating environmental noise in a signal, comprises an op amp U3, wherein a non-inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U2 via a resistor R12 and is grounded via a capacitor C10, an inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U3 and one end of a resistor R15 via a capacitor C11 and is grounded via a resistor R14, and the other end of the resistor R15 is connected to an inverting input terminal of the op amp U2;

[0029] The second filtering circuit is used to eliminate low-frequency interference in the signal, including capacitor C8, capacitor C9 and resistor R13, one end of capacitor C8 is connected to the output end of operational amplifier U2, the other end of capacitor C8 is connected to one end of resistor R13 and the analog-to-digital converter, and the other end of resistor R13 is grounded through capacitor C9.

[0030] Preferably, the microprocessor is a STC15F single chip microcomputer.

[0031] Preferably, the communication interface module includes RS232, RS485 and LAN interface circuits.

[0032] Preferably, the display and interaction module includes:

[0033] A touch display screen is connected to the microprocessor via an SPI serial port;

[0034] The key input circuit is connected to the input pin of the microprocessor, and the user can send a range selection instruction to the microprocessor by selecting a key.

[0035] Preferably, the system further comprises an RFID module, wherein the RFID module comprises:

[0036] An RFID reader / writer, used to identify the electronic tag information on the standard ionization chamber and transmit the read data to the microprocessor;

[0037] The driving circuit includes a field effect transistor Q2 and a field effect transistor Q3, wherein the gate of the field effect transistor Q2 is connected to one end of a resistor R20 and the second control output end of the microprocessor, the source of the field effect transistor Q2 and the other end of the resistor R20 are grounded, the drain of the field effect transistor Q2 is connected to one end of a resistor R21 and the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is connected to the other end of the resistor R21 and a +5V power supply, and the drain of the field effect transistor Q3 is connected to the power supply end of the RFID reader.

[0038] Through the above technical solution, the beneficial effects of the present invention are:

[0039] 1. This application introduces a multi-range amplification control unit, which can automatically or manually switch the circuit amplification parameters according to the amplitude range of the input signal, thereby achieving accurate measurement of the full range; this dynamic range adjustment capability effectively avoids the problems of signal saturation and low signal-to-noise ratio, and significantly improves the accuracy and reliability of the measurement;

[0040] 2. The signal shaping unit set in the system shapes the amplified signal through the integral adjustment circuit and the threshold circuit, reducing the signal's mutation noise and filtering out the tiny noise signal below the threshold, making the useful signal more prominent; at the same time, the noise suppression unit adopts a two-stage filtering circuit to further eliminate the environmental noise and low-frequency interference in the signal, thereby improving the signal quality;

[0041] 3. The system is also equipped with a variety of communication interface modules and user interaction interfaces, which not only realizes extensive connection and efficient interaction with various devices and networks, but also provides users with convenient, intelligent and personalized operation experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural block diagram of the system module of the present invention.

[0043] Figure 2 It is a structural block diagram of the signal processing module in the present invention.

[0044] Figure 3 The figure is a connection principle diagram of the multi-range amplification control unit, the signal shaping unit and the noise suppression unit in the present invention.

[0045] Figure 4 The figure is a connection schematic diagram of the STC15F single chip microcomputer and the key input circuit in the present invention.

[0046] Figure 5 This is a schematic diagram of the driving circuit of the RFID module in the present invention. DETAILED DESCRIPTION

[0047] The above and other technical contents, features and effects of the present invention are described in detail below with reference to the attached Figure 1 To Attachment Figure 5 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0048] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0049] like Figure 1 As shown, a reference-level dosimeter detection signal processing system comprises:

[0050] Signal acquisition module, used to detect radiation particles in the standard ionization chamber and convert them into electrical signal output;

[0051] The signal processing module is used to process and analyze the electrical signals output by the signal acquisition module, such as Figure 2 As shown, specifically including:

[0052] A multi-range amplification control unit automatically or manually switches the circuit amplification parameters according to the amplitude range of the electrical signal to match the measurement range that the system can identify;

[0053] The signal shaping unit is arranged at the output end of the multi-range amplification control unit and is used for shaping the amplified signal;

[0054] A noise suppression unit is arranged at the output end of the signal shaping unit and is used to eliminate background noise and low-frequency interference in the signal;

[0055] an analog-to-digital converter, disposed at the output end of the noise suppression unit, for converting the processed analog electrical signal into a digital signal; and

[0056] A microprocessor for analyzing and calculating the digital signal to determine the radiation dose;

[0057] Display and interaction module, connected to the microprocessor, used to display system status and measurement results, and allow users to operate and set parameters;

[0058] Communication interface module, used for data exchange with external devices.

[0059] In the above, the signal acquisition module includes:

[0060] The detection probe is placed in the standard ionization chamber and is used to convert the ionization effect generated by the interaction between the detection radiation particles and the substances in the ionization chamber into a measurable electrical signal;

[0061] The signal connector is used to stably and reliably transmit the electrical signal to the signal processing module. In specific settings, the signal connector can use a triaxial TNC or triaxial TRT connector to adapt to different application requirements and environmental conditions.

[0062] The electrical signal transmitted through the signal connector is first sent to the multi-range amplification control unit for processing, such as Figure 3 As shown, the unit specifically includes:

[0063] The main amplifying circuit includes an operational amplifier U1, wherein the in-phase input terminal of the operational amplifier U1 is connected to the resistor R1 and one end of the capacitor C1 through the resistor R2, the other end of the capacitor C1 is connected to the signal output end of the signal acquisition module, and the other end of the resistor R1 is grounded;

[0064] The gain control circuit includes a field effect transistor Q1, wherein the drain (pin 1) of the field effect transistor Q1 is connected to one end of a resistor R3 and an inverting input end of an operational amplifier U1, the other end of the resistor R3 is connected to the output end of the operational amplifier U1 and one end of a resistor R4 through a capacitor C2, the other end of the resistor R4 is connected to one end of a resistor R5 and a gate (pin 2) of the field effect transistor Q1, the source (pin 3) of the field effect transistor Q1 is grounded, the other end of the resistor R5 is connected to the cathode of a voltage-stabilizing diode DZ1, one end of a capacitor C3 and a first control output end of a microprocessor, and the anode of the voltage-stabilizing diode DZ1 and the other end of the capacitor C3 are grounded.

[0065] In the specific implementation of the multi-range amplification control unit, the main amplification circuit uses the operational amplifier U1 as the main amplifier to amplify the collected electrical signal. The gain control circuit is set at the negative feedback end of the operational amplifier U1 to adjust its gain parameter. Specifically, the field effect tube Q1 is used as a variable resistor. When the microprocessor outputs control signals of different amplitudes, the conduction degree of the field effect tube Q1 will change, thereby changing the feedback resistance of the operational amplifier U1, and then realizing the gain adjustment of the operational amplifier U1.

[0066] At the same time, resistor R3 and capacitor C2 form a negative feedback network, which stabilizes the amplifier gain and output waveform and prevents self-oscillation and distortion. Zener diode DZ1 and capacitor C3 stabilize and protect the control signal output by the microprocessor.

[0067] Therefore, the multi-range amplification control unit amplifies the input signal through the main amplification circuit, and dynamically adjusts the gain of the amplifier according to the control signal of the microprocessor through the gain control circuit, so that the system can switch the detection range according to the amplitude range of the input signal.

[0068] The amplified signal is sent to the signal shaping unit for further processing, such as Figure 3 As shown, the signal shaping unit includes:

[0069] An operational amplifier U2, wherein the inverting input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U1 through a resistor R6;

[0070] An integral regulating circuit includes a capacitor C4, a capacitor C5, a capacitor C6, a resistor R7 and a resistor R8, wherein one end of the resistor R8 and the capacitor C6 is connected to the resistor R7 and the inverting input end of the operational amplifier U2 through the capacitor C5, the other end of the resistor R8 and the capacitor C6 is connected to the output end of the operational amplifier U2, and the other end of the resistor R7 is grounded through the capacitor C4;

[0071] The threshold circuit is arranged at the non-inverting input terminal of the operational amplifier U2, and is used for providing a threshold voltage to the operational amplifier U2.

[0072] During the operation of the signal shaping unit, the signal amplified by the operational amplifier U1 is input to the inverting input terminal of the operational amplifier U2, and then the input signal is shaped under the action of the resistor and capacitor elements of the integral adjustment circuit to reduce the sudden noise of the signal, so that the pulse electrical signal generated by the radiation particles is converted into a continuous signal that is easier to analyze and process. At the same time, the comparison adjustment circuit sets a threshold voltage and compares the integrated signal with the threshold voltage to filter out the tiny noise signal below the threshold, making the useful signal more prominent, greatly improving the system's resolution of the electrical signal.

[0073] In the above, the threshold circuit includes transistor VT1, the collector of transistor VT1 is connected to the in-phase input terminal of the operational amplifier U2, and is grounded through capacitor C7, the emitter of transistor VT1 is connected to one end of resistor R9 and the input terminal of the three-terminal voltage regulator D1 through resistor R10, the other end of resistor R9 is connected to the +5V power supply, the base of transistor VT1 is connected to one end of resistor R11 and the output terminal of the three-terminal voltage regulator D1, and the other end of resistor R11 is grounded. Among them, the three-terminal voltage regulator D1 provides a stable reference voltage for the base of transistor VT1, and then through the amplification effect of VT1, a stable threshold voltage is formed at the in-phase input terminal of the operational amplifier U2.

[0074] The shaped signal may still contain environmental noise and low-frequency interference signals, so it is further processed by a noise suppression unit. Figure 3 As shown, the noise suppression unit includes:

[0075] A first filtering circuit, for eliminating environmental noise in a signal, comprises an op amp U3, wherein a non-inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U2 via a resistor R12 and is grounded via a capacitor C10, an inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U3 and one end of a resistor R15 via a capacitor C11 and is grounded via a resistor R14, and the other end of the resistor R15 is connected to an inverting input terminal of the op amp U2;

[0076] The second filtering circuit is used to eliminate low-frequency interference in the signal, including capacitor C8, capacitor C9 and resistor R13, one end of capacitor C8 is connected to the output end of operational amplifier U2, the other end of capacitor C8 is connected to one end of resistor R13 and the analog-to-digital converter, and the other end of resistor R13 is grounded through capacitor C9.

[0077] The shaped signal first enters the first filtering circuit, which uses a bandpass filter to extract the specified frequency band of the useful signal and suppresses high-frequency and low-frequency signals that exceed the frequency band. The output signal of the first filtering circuit is input into the op amp U2 to form a feedback loop to improve the stability and bandwidth of the filter. After being processed by the first filtering circuit, the environmental noise in the signal is significantly reduced, making the signal purer. The second filtering circuit uses the RC filter principle to further eliminate the residual low-frequency noise to achieve the best filtering effect. Through the above filtering processing, the quality of the collected signal has been greatly improved, greatly improving the accuracy and stability of the reference-level dosimeter detection.

[0078] In the specific implementation process, the system uses STC15F single-chip microcomputer as the core microprocessor, which is responsible for the overall data processing and control. The system is also equipped with a variety of communication interface modules, including RS232, RS485 and LAN interface circuits, which provide flexible data transmission methods and ensure that the reference-level dosimeter can communicate with external devices efficiently and stably.

[0079] In addition, in order to enhance the user experience, the system also integrates display and interaction modules, including:

[0080] The touch screen is connected to the microprocessor via the SPI serial port, realizing an intuitive operation interface and result display;

[0081] The key input circuit is connected to the input pin of the microprocessor, and the user can send a range selection instruction to the microprocessor by selecting a key.

[0082] When implementing it, Figure 4As shown in the figure, users can easily select high, medium and low ranges through buttons SW0, SW1 and SW2. Among them, the high range is ± (10nA-2.5μA), the medium range is ± (100pA-25nA), and the low range is ± (0.200pA-250pA); each button corresponds to a range setting. When the user presses one of the buttons, the button input circuit will send a corresponding command signal to the STC15F microcontroller. After receiving the command signal, the microcontroller will parse and identify the range selected by the user, and then adjust the control signal amplitude of the DAC at its first control output terminal accordingly to adjust the system amplification parameters and provide users with accurate and reliable dose detection results.

[0083] At the same time, the system also includes RFID modules, such as Figure 5 As shown, the RFID module includes:

[0084] RFID reader / writer, used to identify the electronic tag information on the standard ionization chamber and transmit the read data to the microprocessor;

[0085] The driving circuit includes a field effect transistor Q2 and a field effect transistor Q3, wherein the gate of the field effect transistor Q2 is connected to one end of a resistor R20 and a second control output end of a microprocessor, the source of the field effect transistor Q2 and the other end of the resistor R20 are grounded, the drain of the field effect transistor Q2 is connected to one end of a resistor R21 and the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is connected to the other end of the resistor R21 and a +5V power supply, and the drain of the field effect transistor Q3 is connected to the power supply end of an RFID reader.

[0086] When used, the RFID reader in the reference-level dosimeter of this application will automatically identify the electronic tag attached to the ionization chamber, and send the data information in the tag to the microprocessor for analysis to extract key information such as the output signal range of the ionization chamber. According to the range of the ionization chamber, the microprocessor automatically matches and selects the appropriate detection range, and automatically adjusts the amplification parameters.

[0087] In summary, this application introduces a multi-range amplification control unit, which can automatically or manually switch the circuit amplification parameters according to the amplitude range of the input signal, thereby achieving accurate measurement of the full range. This dynamic range adjustment capability effectively avoids the problems of signal saturation and low signal-to-noise ratio, and significantly improves the accuracy and reliability of the measurement.

[0088] The signal shaping unit set in the system shapes the amplified signal through the integral adjustment circuit and the threshold circuit, reducing the signal's mutation noise and filtering out the tiny noise signal below the threshold, making the useful signal more prominent. At the same time, the noise suppression unit adopts a two-stage filtering circuit to further eliminate the environmental noise and low-frequency interference in the signal, improving the signal quality.

[0089] The system is also equipped with a variety of communication interface modules and user interaction interfaces, which not only realizes extensive connection and efficient interaction with various devices and networks, but also provides users with convenient, intelligent and personalized operation experience.

[0090] The above is a further detailed description of the present invention in combination with a specific implementation method, and it cannot be determined that the specific implementation of the present invention is limited to this; for technical personnel in the technical field to which the present invention belongs and related technical fields, based on the technical solution of the present invention, the expansion and replacement of operating methods and data should all fall within the protection scope of the present invention.

Claims

1. A reference-level dosimeter detection signal processing system, characterized in that: include: Signal acquisition module, used to detect radiation particles in the standard ionization chamber and convert them into electrical signal output; The signal processing module is used to process and analyze the electrical signal output by the signal acquisition module, specifically including: A multi-range amplification control unit automatically or manually switches circuit amplification parameters according to the amplitude range of the electrical signal to match the measurement range that can be identified by the system; A signal shaping unit, arranged at the output end of the multi-range amplification control unit, for shaping the amplified signal; A noise suppression unit, arranged at the output end of the signal shaping unit, for eliminating environmental noise and low-frequency interference in the signal; an analog-to-digital converter, disposed at the output end of the noise suppression unit, for converting the processed analog electrical signal into a digital signal; and A microprocessor, used for analyzing and calculating the digital signal to determine the radiation dose; A display and interaction module, connected to the microprocessor, for displaying system status and measurement results, and allowing the user to perform operations and parameter settings; Communication interface module, used for data exchange with external devices; The multi-range amplification control unit comprises: A main amplifying circuit, comprising an op amp U1, wherein a non-inverting input terminal of the op amp U1 is connected to a resistor R1 and one end of a capacitor C1 through a resistor R2, the other end of the capacitor C1 is connected to a signal output terminal of the signal acquisition module, and the other end of the resistor R1 is grounded; A gain control circuit includes a field effect transistor Q1, a drain of the field effect transistor Q1 is connected to one end of a resistor R3 and an inverting input end of an operational amplifier U1, the other end of the resistor R3 is connected to the output end of the operational amplifier U1 and one end of a resistor R4 through a capacitor C2, the other end of the resistor R4 is connected to one end of a resistor R5 and a gate of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded, the other end of the resistor R5 is connected to the cathode of a voltage-stabilizing diode DZ1, one end of the capacitor C3 and a first control output end of the microprocessor, and the anode of the voltage-stabilizing diode DZ1 and the other end of the capacitor C3 are grounded; The signal shaping unit comprises: An operational amplifier U2, wherein the inverting input terminal of the operational amplifier U2 is connected to the output terminal of the operational amplifier U1 through a resistor R6; An integral regulating circuit includes a capacitor C4, a capacitor C5, a capacitor C6, a resistor R7 and a resistor R8, wherein one end of the resistor R8 and the capacitor C6 are connected to one end of the resistor R7 and the inverting input end of the operational amplifier U2 through the capacitor C5, the other end of the resistor R8 and the capacitor C6 are connected to the output end of the operational amplifier U2, and the other end of the resistor R7 is grounded through the capacitor C4; A threshold circuit is arranged at the non-inverting input terminal of the operational amplifier U2 and is used to provide a threshold voltage to the operational amplifier U2; The threshold circuit includes a transistor VT1, the collector of the transistor VT1 is connected to the in-phase input terminal of the operational amplifier U2, and is grounded through a capacitor C7, the emitter of the transistor VT1 is connected to one end of a resistor R9 and an input terminal of a three-terminal voltage regulator D1 through a resistor R10, the other end of the resistor R9 is connected to a +5V power supply, the base of the transistor VT1 is connected to one end of a resistor R11 and an output terminal of the three-terminal voltage regulator D1, and the other end of the resistor R11 is grounded; The noise suppression unit comprises: A first filtering circuit, for eliminating environmental noise in a signal, comprises an op amp U3, wherein a non-inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U2 via a resistor R12 and is grounded via a capacitor C10, an inverting input terminal of the op amp U3 is connected to an output terminal of the op amp U3 and one end of a resistor R15 via a capacitor C11 and is grounded via a resistor R14, and the other end of the resistor R15 is connected to an inverting input terminal of the op amp U2; The second filtering circuit is used to eliminate low-frequency interference in the signal, including capacitor C8, capacitor C9 and resistor R13, one end of capacitor C8 is connected to the output end of operational amplifier U2, the other end of capacitor C8 is connected to one end of resistor R13 and the analog-to-digital converter, and the other end of resistor R13 is grounded through capacitor C9.

2. A reference-level dosimeter detection signal processing system according to claim 1, characterized in that: The signal acquisition module comprises: A detection probe, disposed in the standard ionization chamber, for converting the ionization effect generated by the interaction between the detection radiation particles and the substances in the ionization chamber into a measurable electrical signal; The signal connector is used to transmit the electrical signal to the signal processing module.

3. The reference-level dosimeter detection signal processing system according to claim 1, characterized in that: The microprocessor is a STC15F single chip microcomputer.

4. A reference-level dosimeter detection signal processing system according to claim 3, characterized in that: The communication interface module includes RS232, RS485 and LAN interface circuits.

5. A reference-level dosimeter detection signal processing system according to claim 4, characterized in that: The display and interaction module includes: A touch display screen is connected to the microprocessor via an SPI serial port; The key input circuit is connected to the input pin of the microprocessor, and the user can send a range selection instruction to the microprocessor by selecting a key.

6. The reference-level dosimeter detection signal processing system according to claim 1, characterized in that: The system further comprises an RFID module, wherein the RFID module comprises: An RFID reader / writer, used to identify the electronic tag information on the standard ionization chamber and transmit the read data to the microprocessor; The driving circuit includes a field effect transistor Q2 and a field effect transistor Q3, wherein the gate of the field effect transistor Q2 is connected to one end of a resistor R20 and the second control output end of the microprocessor, the source of the field effect transistor Q2 and the other end of the resistor R20 are grounded, the drain of the field effect transistor Q2 is connected to one end of a resistor R21 and the gate of the field effect transistor Q3, the source of the field effect transistor Q3 is connected to the other end of the resistor R21 and a +5V power supply, and the drain of the field effect transistor Q3 is connected to the power supply end of the RFID reader.

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