An apparatus and method for processing signal pile-up in a simulated multi-channel system
Patent Information
- Application Number
- CN202611052074.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-15
- Publication Date
- 2026-10-16
AI Technical Summary
因此，本发明提供了一种模拟多道系统中信号堆积处理装置与方法，能够处理多源信息的堆砌判别处理适应性差的问题
本发明一种模拟多道系统中信号堆积处理装置与方法，信号处理模块中ADC采集电路和处理器接收峰位时间信号，ADC采集电路将峰位时间信号转换峰值电压；处理器接收峰位时间信号后，采集下一个峰位时间信号的出现，计算此峰位时间信号与下一峰位时间信号的时间间隔，设置动态堆积判弃阈值，通过逻辑判断电路将时间间隔与堆积判弃阈值进行比较，判定是否发生信号堆积。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of nuclear radiation monitoring technology, specifically to a signal accumulation processing device and method in a simulated multichannel system. Background Technology
[0002] Nuclear signal energy spectrum describes the energy distribution of nuclear radiation particles (such as alpha particles, beta particles, gamma photons, and neutrons). It is a core tool in nuclear physics, radiation detection, nuclear medicine, and geological exploration for analyzing the types, abundance, and radiation characteristics of nuclides. In nuclear radiation detection scenarios, classifying and counting nuclear radiation pulse signals by amplitude is an important method for analyzing nuclear signal energy spectrum. However, nuclear radiation particle pulse signals are random and sudden. When the radiation source activity is high or the particle flux in the detection environment is large, signal accumulation can easily occur, making it impossible to accurately reflect the true energy of nuclear radiation pulse particles.
[0003] Existing signal accumulation processing devices input fast discrimination signals into RS flip-flops. The flip-flops generate a fixed gate width. If multiple signals are within the gate width, a low level is output, closing the linear gate and blocking the accumulation signal; if a single signal is present, a high level is output, opening the linear gate and allowing unaccumulated signals. Signals are discarded based on the number of accumulated signals. However, signals are prone to superposition or distortion, leading to signal deviations and errors in signal accumulation processing. Furthermore, the signal accumulation processing circuit is complex. The accumulation rejection threshold requires adjustment of the resistor-capacitor component that generates the gate width of the RS flip-flop. When the type of nuclear radiation pulse signal measured by the user changes, the width of the nuclear radiation pulse signal needs to be changed, but the accumulation rejection threshold cannot be modified, resulting in poor adaptability. Summary of the Invention
[0004] I. Technical problems to be solved Therefore, the present invention provides a signal stacking processing device and method in a simulated multichannel system, which can address the problem of poor adaptability in stacking discrimination processing of multi-source information.
[0005] II. Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a signal accumulation processing device for an analog multichannel system, the device comprising: The filtering and amplification module performs low-noise filtering and primary linear amplification on the input nuclear radiation pulse signal, and divides the amplified pulse signal into a first branch signal output and a second branch signal output that are synchronous from the same source; the first branch is used for time signal discrimination of the input event, and the second branch is used for energy detection. A programmable amplifier module, connected to the second branch, is used to receive the pulse signal output by the second branch and perform corresponding gain adjustment according to the detected energy range; The shaping amplification module, connected to the programmable amplification module, converts the amplified pulse signal into a standard shaping pulse signal with a preset time constant; the output of the shaping amplification module is divided into two paths, wherein... One output goes to the peak position identification circuit, which is used to detect the time when the peak of the forming signal appears and output the corresponding peak position time signal. The other output is sent to the analog peak broadening circuit to extend the peak duration of the shaped signal and form a broadened energy signal for ADC sampling; The signal processing module is used to perform synchronization control and accumulation rejection processing steps: The processor in the signal processing module calculates the time interval based on the time signals of adjacent events in the first branch. When the time interval is less than a set threshold, it generates a stacking suppression signal and enters a stacking suppression state, prohibiting subsequent peak time signals from triggering ADC sampling, and continues to maintain the suppression state until the corresponding formed signal recovers to below the preset baseline threshold and then the suppression state is released. When the processor receives the peak time signal before entering the accumulation suppression state, it controls the ADC to perform peak sampling on the broadened energy signal to complete single-event energy acquisition. The processor associates and encapsulates the time information of valid events with the corresponding collected energy information to generate the final energy spectrum data.
[0006] Furthermore, the filtering and amplification module filters and amplifies the nuclear radiation pulse signal. The filtering and amplification module filters out the power frequency interference and high-frequency noise of the nuclear radiation pulse signal through an active filter chip, and amplifies the filtered pulse signal through an operational amplifier, matching the fast discrimination unit circuit in the filtering and amplification module.
[0007] Furthermore, the fast discrimination unit in the filtering and amplification module detects the input pulse signal through a comparison circuit. The comparison circuit in the fast discrimination unit compares the intensity of the pulse signal and outputs the square wave signal through a comparator. A monostable multivibrator is used to digitally shape the square wave signal with a large intensity and output the shaped square wave signal, thereby converting the pulse signal of the first branch into the square wave signal.
[0008] Furthermore, in the shaping and amplification module, the linear gate performs amplitude shaping and level calibration on the square wave signal, and inputs the output signal through the linear gate into the analog peak broadening circuit. The analog peak broadening circuit is used to maintain and broaden the peak value of the shaped square wave signal to extend the peak value duration and form a stable broadened energy signal for ADC sampling.
[0009] Furthermore, the signal processing module receives the time signal output from the first branch, the peak time signal output from the peak position discrimination circuit, and the broadened energy signal output from the analog peak broadening circuit, respectively. After receiving the peak time signal, the processor calculates the time interval between the peak time signals of adjacent events. The processor then compares the time interval with the stacking rejection threshold using a logic judgment circuit to determine whether signal stacking has occurred. If the time interval is less than the set stacking rejection threshold, signal stacking has occurred, and the processor skips the acquisition of this peak signal voltage. If the time interval is greater than the set stacking rejection threshold, signal stacking has not occurred, and the processor reads the time information of this peak signal voltage from the ADC acquisition circuit.
[0010] Furthermore, the processor in the signal processing module sets the stacking rejection threshold based on the width of the nuclear radiation pulse signal; the processor presets the mapping relationship between the pulse signal width and the stacking rejection threshold, customizes the matching stacking rejection threshold parameters through the communication interface on the processor, and sends the stacking rejection threshold parameters to the stacking discrimination circuit. The stacking discrimination circuit performs real-time discrimination on the input pulse signal based on the custom-set stacking rejection threshold, and dynamically sets the stacking rejection threshold based on the width of the nuclear radiation signal.
[0011] Furthermore, the stacking rejection threshold is dynamically set to a range of 204 ns to 393216 ns.
[0012] A signal stacking processing method performed using the modules of the above-mentioned device includes the following steps: The input nuclear radiation pulse signal is subjected to low-noise filtering and primary linear amplification, and the amplified pulse signal is synchronously time-discriminated and energy-detected. Gain amplification is performed on the output pulse signal after energy detection to match the detected signals of different energy ranges; The output pulse signal after energy detection is shaped to convert the narrow pulse into a standard shaped pulse signal with a defined time constant. Then, it is sampled by an ADC to output a peak time signal that indicates the time position of the peak. Synchronization processing and backlog rejection processing are performed on each output signal, including the following processing steps: The output signal after time discrimination is converted into a square wave time pulse. The time interval is calculated based on adjacent pulses. When the time interval is less than a set threshold, the ADC acquisition process is prohibited; otherwise, the ADC is triggered to perform peak sampling on the formed signal to complete energy acquisition. Establish the time-energy correspondence for individual events, associate and encapsulate the time information of valid events with the corresponding collected energy information, and generate the final energy spectrum data.
[0013] III. Beneficial Effects: Compared with the prior art, this invention has the following beneficial effects: This invention discloses a signal accumulation processing device and method in a simulated multichannel system. In the signal processing module, an ADC acquisition circuit and a processor receive peak time signals. The ADC acquisition circuit converts the peak time signals into peak voltages. After receiving the peak time signals, the processor acquires the occurrence of the next peak time signal, calculates the time interval between the current peak time signal and the next peak time signal, sets a dynamic accumulation rejection threshold, and compares the time interval with the accumulation rejection threshold through a logic judgment circuit to determine whether signal accumulation has occurred.
[0014] Finally, by calculating the time interval of the peak position signal, errors in signal peak values caused by signal superposition are avoided, thus improving the accuracy of signal peak acquisition. Furthermore, by dynamically setting the accumulation rejection threshold, the accumulation judgment criteria for different signal types are precisely defined, improving the accuracy and efficiency of signal accumulation processing. Attached Figure Description
[0015] Figure 1 This is a block diagram illustrating the module principle of a signal accumulation processing device in an analog multichannel system according to the present invention. Figure 2 This invention provides a schematic diagram of the working process of a signal accumulation processing device in an analog multichannel system. Figure 3 This is a schematic diagram of a signal stacking processing device in an analog multichannel system, provided by an embodiment of the present invention, in which a narrow pulse signal is input, a fast discrimination signal is generated, and a shaping signal is generated. Figure 4 This is a flowchart illustrating the process of determining peak position time signals by using a stacking rejection threshold in a signal stacking processing device for an analog multichannel system, as provided in an embodiment of the present invention. In the diagram: 1. Filtering and amplification module; 2. Programmable amplification module; 3. Shaping amplification module; 4. Signal processing module. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] Signal accumulation occurs because nuclear radiation pulse signals widen during the shaping and amplification process. This widening causes adjacent signals to overlap, raising the peak values of the two adjacent formed signals and resulting in signal accumulation. Different nuclear radiation pulse signals have different pulse widths, causing the overlap of adjacent signals to occur at different times. Therefore, different accumulation rejection thresholds need to be set to determine whether nuclear radiation pulse signals are accumulating. When simulating multichannel systems to test nuclear radiation pulse signals, the accumulation rejection threshold needs to be adjusted according to the width of the measured nuclear radiation signal.
[0018] This invention discloses a signal accumulation processing device and method in a simulated multichannel system. In the signal processing module 4, an ADC acquisition circuit and a processor receive peak time signals. The ADC acquisition circuit converts the peak time signals into peak voltages. After receiving the peak time signals, the processor acquires the occurrence of the next peak time signal, calculates the time interval between the current peak time signal and the next peak time signal, sets a dynamic accumulation rejection threshold, and compares the time interval with the accumulation rejection threshold using a logic judgment circuit to determine whether signal accumulation has occurred. By calculating the time interval of the peak time signals, errors in signal quantity due to signal superposition or distortion are avoided, improving the accuracy of signal discrimination. Signal accumulation is mainly processed through a fast discrimination unit connected to the processor, simplifying the circuit connection. By dynamically setting the accumulation rejection threshold, the accumulation judgment criteria for different signal types are precisely defined, improving the accuracy and efficiency of signal accumulation processing.
[0019] like Figure 1 As shown, the filtering and amplification module 1 filters and amplifies the input nuclear radiation pulse signal, and divides the amplified pulse signal into a first branch and a second branch. The fast discrimination unit detects the pulse signal of the first branch through the comparison circuit and converts the pulse signal of the first branch into a square wave signal. The programmable amplifier module 2 is connected to the filter amplifier module 1, receives the second branch pulse signal, amplifies the second branch pulse signal by a factor, and the processor controls the amplification factor of the second branch pulse signal so that the programmable amplifier module 2 outputs a matching signal, which matches the peak voltage signal. The shaping amplification module 3 connects to the filtering amplification module 1 and the programmable amplification module 2, and transmits the square wave signal and the matching signal to the processor and the peak position discrimination circuit. The linear gate in the processor transmits the square wave signal and the matching signal to the peak broadening circuit for widening to obtain the peak position voltage signal. When the square wave signal and the matching signal have a peak position, the peak position discrimination circuit sends out a square wave signal to obtain the peak position time signal. Signal processing module 4 connects to programmable amplifier module 2 and shaping amplifier module 3; the ADC acquisition circuit and processor receive the peak time signal, and the ADC acquisition circuit converts the peak time signal into a peak voltage; after receiving the peak time signal, the processor acquires the occurrence of the next peak time signal, calculates the time interval between this peak time signal and the next peak time signal, sets a dynamic accumulation rejection threshold, and compares the time interval with the accumulation rejection threshold through a logic judgment circuit to determine whether signal accumulation has occurred; if signal accumulation occurs, the acquisition of this peak signal voltage is skipped; if no signal accumulation occurs, it means that this signal is normal, the data of this peak signal voltage in the ADC acquisition circuit is read, and then the signal accumulation is processed to obtain the signal energy spectrum.
[0020] like Figure 2 As shown, a specific method for processing signal accumulation in a simulated multichannel system includes the following steps: the simulated multichannel system performs filtering and amplification, programmable amplification, fast discrimination and judgment, signal shaping and amplification, baseline recovery, peak detection, simulated peak broadening, and ADC acquisition on the nuclear radiation pulse signal acquired by the sensor, thereby processing the signal accumulation.
[0021] After being filtered and amplified by the first-stage filtering and amplification module 1, the nuclear radiation pulse signal is sent to the processor after passing through the fast discrimination unit for stacking and disposal; another path is sent to the programmable amplification module 2, which controls the amplification factor through the processor to match the output signal magnitude with the requirements of the subsequent stage.
[0022] The third stage, shaping and amplification module 3, shapes and widens the pulse signal to highlight the peak voltage. In the shaping signal module, the shaped signal is sent to the peak broadening circuit via a processor-controlled linear gate to further emphasize the peak voltage, facilitating its acquisition by the ADC chip in the subsequent ADC acquisition circuit. Another path of the shaped signal is sent to the peak discrimination circuit. When the peak of the pulse signal appears, the peak discrimination circuit emits a square wave signal, which is the peak time signal. For a detailed schematic diagram of the input narrow pulse signal, fast discrimination signal, and shaped signal, please refer to [link to schematic diagram]. Figure 3 .
[0023] The peak position time signal is sent to both the ADC acquisition circuit and the processor. Upon receiving the peak position time signal, the ADC acquisition circuit begins acquiring and converting the peak voltage. Upon receiving the peak position time signal, the processor acquires the occurrence of this signal and the next signal, calculates the time interval, and compares it with the accumulation rejection threshold. If the value is less than the accumulation rejection threshold, the signal is considered to be accumulating, and the reading of data acquired by the ADC chip in the ADC acquisition circuit is skipped. If the value is greater than the accumulation rejection threshold, the signal is considered normal, and the data acquired by the ADC chip in the ADC acquisition circuit is read and saved to the energy spectrum, thus addressing the signal accumulation issue. The communication interface enables the modification of the accumulation rejection threshold and the uploading of the energy spectrum.
[0024] Specifically, the filtering and amplification module 1 filters and amplifies the nuclear radiation pulse signal, and divides the amplified pulse signal into a first branch and a second branch. The fast discrimination unit detects the pulse signal of the first branch. The filtering and amplification module 1 filters out the power frequency interference and high frequency noise of the nuclear radiation pulse signal through an active filter chip, and amplifies the filtered pulse signal through an operational amplifier to match the circuit in the fast discrimination unit.
[0025] The fast discrimination unit detects the pulse signal of the first branch through a comparator circuit. The comparator circuit in the fast discrimination unit compares the intensity of the pulse signal and outputs a square wave signal through the comparator. A monostable multivibrator is used to digitally shape the signal with a large square wave signal and output the shaped square wave signal, thereby converting the pulse signal of the first branch into a square wave signal.
[0026] In this embodiment, the fast discrimination unit detects the nuclear radiation pulse signal using a comparator circuit before it fully forms, converting it into a square wave. Since the width of the square wave signal at this point is affected by the amplitude and width of the pulse signal, it may still exhibit jitter, affecting subsequent signal accumulation time acquisition. Therefore, a monostable multivibrator is used after the comparator in the comparator circuit to digitally shape the strong output square wave signal, making the square wave signal output more stable, before sending the shaped square wave to the processor.
[0027] The shaping amplification module 3 connects to the filtering amplification module 1 and the programmable amplification module 2, transmitting the square wave signal and the matching signal to the processor. The linear gate in the processor performs amplitude shaping and level calibration on the square wave signal and the matching signal, and inputs the output signal after passing through the linear gate into the peak broadening circuit. The peak broadening circuit extends the duration of the output signal, thereby widening the square wave signal and the matching signal to obtain the peak voltage signal.
[0028] Signal processing module 4 connects to programmable amplifier module 2 and shaping amplifier module 3 to acquire peak voltage; the ADC acquisition circuit and processor in signal processing module 4 receive peak time signal, and the ADC acquisition circuit converts peak time signal into peak voltage; After receiving the peak time signal, the processor acquires the next peak time signal, calculates the time interval between the current peak time signal and the next peak time signal, dynamically sets the accumulation rejection threshold, and compares the time interval with the accumulation rejection threshold through a logic judgment circuit to determine whether signal accumulation has occurred. If the time interval is less than the set accumulation rejection threshold, signal accumulation has occurred, and the processor skips the acquisition of this peak signal voltage. If the time interval is greater than the set accumulation rejection threshold, signal accumulation has not occurred, and the processor reads the data of this peak signal voltage from the ADC acquisition circuit.
[0029] like Figure 3As shown in this embodiment, when a peak time signal appears, the processor collects the occurrence of this peak time signal and the next peak time signal before collecting the peak signal, and calculates the time interval. If the timing interval is less than the set stacking rejection threshold, it indicates that peak stacking has occurred, and the processor skips the acquisition of this peak signal; otherwise, it indicates that peak stacking has not occurred, and the processor normally collects the current peak signal and saves it to the energy spectrum.
[0030] Furthermore, the signal processing module 4 dynamically sets the stacking rejection threshold. The processor in the signal processing module 4 dynamically sets the stacking rejection threshold according to the width of the nuclear radiation pulse signal. The processor presets the mapping relationship between the pulse signal width and the stacking rejection threshold, and customizes the matching stacking rejection threshold parameters through the RS232 or RS485 communication interface. The stacking rejection threshold parameters are sent to the stacking discrimination circuit. The stacking discrimination circuit performs real-time discrimination on the input pulse signal according to the customized stacking rejection threshold, and then dynamically sets the stacking rejection threshold according to the width of the nuclear radiation signal.
[0031] Furthermore, the stacking rejection threshold is dynamically set to a range of 204ns to 393216ns.
[0032] In this embodiment, the minimum adjustment unit for the stacking rejection threshold is 12ns.
[0033] The present invention provides a signal accumulation processing method in an analog multichannel system: the input nuclear radiation pulse signal is filtered and amplified, and the amplified pulse signal is divided into a first branch and a second branch. The fast discrimination unit detects the pulse signal of the first branch through a comparison circuit and converts the pulse signal of the first branch into a square wave signal. The second branch pulse signal is amplified by a factor, and the processor controls the amplification factor of the second branch pulse signal so that the programmable amplifier module 2 outputs a matching signal, which matches the peak voltage signal. The processor acquires a square wave signal and a matching signal. A linear gate in the processor transmits the square wave signal and the matching signal to a peak broadening circuit for widening, thereby acquiring the peak voltage signal. When a peak appears in the square wave signal and the matching signal, the peak position discrimination circuit emits a square wave signal, thereby acquiring the peak position time signal. The ADC acquisition circuit and processor receive the peak time signal. The ADC acquisition circuit converts the peak time signal into a peak voltage. After receiving the peak time signal, the processor acquires the occurrence of the next peak time signal, calculates the time interval between the current peak time signal and the next peak time signal, dynamically sets the stacking rejection threshold, and compares the time interval with the stacking rejection threshold through a logic judgment circuit to determine whether signal stacking has occurred. Then, the signal stacking is processed to obtain the signal energy spectrum.
[0034] This invention discloses a signal accumulation processing device and method in a simulated multichannel system. A filtering and amplification module 1 filters and amplifies the input nuclear radiation pulse signal; a fast discrimination unit converts the pulse signal into a square wave signal via a comparison circuit; a shaping and amplification module 3 processes the square wave signal to obtain the peak position time signal; an ADC acquisition circuit and a processor in a signal processing module 4 receive the peak position time signal, and the ADC acquisition circuit converts the peak position time signal into a peak voltage; after receiving the peak position time signal, the processor acquires the occurrence of the next peak position time signal, calculates the time interval between this peak position time signal and the next peak position time signal, sets a dynamic accumulation rejection threshold, and compares the time interval with the accumulation rejection threshold through a logic judgment circuit to determine whether signal accumulation has occurred. This invention avoids errors in signal quantity due to signal superposition or distortion by calculating the time interval of the peak position time signal, thus improving the accuracy of signal discrimination; it mainly processes signal accumulation by connecting the fast discrimination unit and the processor, simplifying the circuit connection; and by dynamically setting the accumulation rejection threshold, it accurately defines the accumulation judgment criteria for different signal types, improving the accuracy and efficiency of signal accumulation processing.
[0035] It should be noted that the numerous details included in the above description are merely illustrative of the invention and not intended to limit it. In other embodiments of the invention, the method may have more, fewer, or different steps, and the order, inclusion, function, etc., of the steps may differ from those described and illustrated.
Claims
1. A signal stacking processing device for an analog multichannel system, characterized in that, Includes the following modules: The filtering and amplification module performs low-noise filtering and primary linear amplification on the input nuclear radiation pulse signal, and divides the amplified pulse signal into a first branch signal output and a second branch signal output that are synchronous from the same source. The first branch is used for time signal discrimination of input events, and the second branch is used for energy detection; A programmable amplifier module, connected to the second branch, is used to receive the pulse signal output by the second branch and perform corresponding gain adjustment according to the detected energy range; The shaping amplification module, connected to the programmable amplification module, converts the amplified pulse signal into a standard shaping pulse signal with a preset time constant; the output of the shaping amplification module is divided into two paths, wherein... One output goes to the peak position identification circuit, which is used to detect the time when the peak of the forming signal appears and output the corresponding peak position time signal. The other output is sent to the analog peak broadening circuit to extend the peak duration of the shaped signal and form a broadened energy signal for ADC sampling; The signal processing module is used to perform synchronization control and accumulation rejection processing steps: The processor in the signal processing module calculates the time interval based on the time signals of adjacent events in the first branch. When the time interval is less than a set threshold, it generates a stacking suppression signal and enters a stacking suppression state, prohibiting subsequent peak time signals from triggering ADC sampling, and continues to maintain the suppression state until the corresponding formed signal recovers to below the preset baseline threshold and then the suppression state is released. When the processor receives the peak time signal before entering the accumulation suppression state, it controls the ADC to perform peak sampling on the broadened energy signal to complete single-event energy acquisition. The processor associates and encapsulates the time information of valid events with the corresponding collected energy information to generate the final energy spectrum data.
2. The signal stacking processing device in an analog multichannel system according to claim 1, characterized in that, The filtering and amplification module filters and amplifies the nuclear radiation pulse signal. The filtering and amplification module filters out the power frequency interference and high frequency noise of the nuclear radiation pulse signal through an active filter chip, and amplifies the filtered pulse signal through an operational amplifier, matching the fast discrimination unit circuit in the filtering and amplification module.
3. The signal accumulation processing device in an analog multichannel system according to claim 2, characterized in that, The fast discrimination unit in the filtering and amplification module detects the input pulse signal through a comparison circuit. The comparison circuit in the fast discrimination unit compares the intensity of the pulse signal and outputs the square wave signal through the comparator. A monostable multivibrator is used to digitally shape the square wave signal with a large intensity and output the shaped square wave signal, thereby converting the pulse signal of the first branch into the square wave signal.
4. The signal accumulation processing device in an analog multichannel system according to claim 3, characterized in that, In the shaping and amplification module, the linear gate performs amplitude shaping and level calibration on the square wave signal. The output signal after passing through the linear gate is input to the analog peak broadening circuit. The analog peak broadening circuit is used to maintain and broaden the peak value of the shaped square wave signal to extend the peak value duration and form a stable broadened energy signal for ADC sampling.
5. The signal stacking processing device in an analog multichannel system according to claim 1, characterized in that, The signal processing module receives the time signal output from the first branch, the peak time signal output from the peak position discrimination circuit, and the broadened energy signal output from the analog peak broadening circuit, respectively. After receiving the peak time signal, the processor calculates the time interval between the peak time signals of adjacent events. The processor then compares the time interval with the stacking rejection threshold using a logic judgment circuit to determine whether signal stacking has occurred. If the time interval is less than the set stacking rejection threshold, signal stacking has occurred, and the processor skips the acquisition of this peak signal voltage. If the time interval is greater than the set stacking rejection threshold, signal stacking has not occurred, and the processor reads the time information of this peak signal voltage from the ADC acquisition circuit.
6. The signal stacking processing device in an analog multichannel system according to claim 5, characterized in that, The processor in the signal processing module sets the stacking rejection threshold based on the width of the nuclear radiation pulse signal. The processor presets the mapping relationship between the pulse signal width and the stacking rejection threshold, customizes the stacking rejection threshold parameter through the communication interface on the processor, and sends the stacking rejection threshold parameter to the stacking discrimination circuit. The stacking discrimination circuit performs real-time discrimination on the input pulse signal based on the customized stacking rejection threshold and dynamically sets the stacking rejection threshold according to the width of the nuclear radiation signal.
7. The signal stacking processing device in an analog multichannel system according to claim 6, characterized in that, The stacking rejection threshold is dynamically set to a range of 204ns to 393216ns.
8. A method for processing signal accumulation in an analog multichannel system, characterized in that, The method includes the following steps: The input nuclear radiation pulse signal is subjected to low-noise filtering and primary linear amplification, and the amplified pulse signal is synchronously time-discriminated and energy-detected. Gain amplification is performed on the output pulse signal after energy detection to match the detected signals of different energy ranges; The output pulse signal after energy detection is shaped to convert the narrow pulse into a standard shaped pulse signal with a defined time constant. Then, it is sampled by an ADC to output a peak time signal that indicates the time position of the peak. Synchronization processing and backlog rejection processing are performed on each output signal, including the following processing steps: The output signal after time discrimination is converted into a square wave time pulse. The time interval is calculated based on adjacent pulses. When the time interval is less than a set threshold, the ADC acquisition process is prohibited; otherwise, the ADC is triggered to perform peak sampling on the formed signal to complete energy acquisition. Establish the time-energy correspondence for individual events, associate and encapsulate the time information of valid events with the corresponding collected energy information, and generate the final energy spectrum data.