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A Pulse Amplitude Measuring Circuit and Method for Reducing Counting Loss

A technology of pulse amplitude and count loss, which is applied in the field of nuclear pulse signal amplitude measurement, can solve the problems of difficult increase of count rate and count loss, and achieve the effects of fast speed, improved processing capacity and high precision

Active Publication Date: 2017-11-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Tail accumulation will cause the amplitude of the next pulse to be distorted, so the usual processing method is to retain the information of the previous peak and discard the pulse with tail accumulation later; this will cause a part of the counting loss, making it difficult to increase the effective counting rate

Method used

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  • A Pulse Amplitude Measuring Circuit and Method for Reducing Counting Loss
  • A Pulse Amplitude Measuring Circuit and Method for Reducing Counting Loss
  • A Pulse Amplitude Measuring Circuit and Method for Reducing Counting Loss

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Embodiment 1

[0061] Figure 4 It is a schematic diagram of a pulse amplitude measurement circuit for reducing count loss provided by Embodiment 1 of the present invention. Such as Figure 4 As shown, the circuit mainly includes: forming amplifier circuit, high-speed AD conversion circuit, fast peak-seeking and discharge control circuit, and signal fast recovery circuit;

[0062] Wherein, the shaping amplifier circuit is used to expand the random pulse signal output by the nuclear detector into a pulse shape with a flat top that is convenient for amplitude measurement, and amplify the signal amplitude before outputting;

[0063] The high-speed AD conversion circuit is used to continuously sample the pulse signal output by the forming amplifier circuit and convert it into a digital quantity for output;

[0064] The fast peak-seeking and discharge control circuit is used to calculate the amplitude of the digital signal waveform output by the high-speed AD conversion circuit, store it after ...

Embodiment 2

[0086] An embodiment of the present invention provides a pulse amplitude measurement method that reduces count loss, and the method can be implemented based on the circuit described in the first embodiment. Such as Figure 9 As shown, it mainly includes:

[0087] Step 91: The random pulse signal output by the nuclear detector is broadened by the shaping and amplifying circuit into a pulse shape with a flat top that is convenient for amplitude measurement, and the signal amplitude is amplified before outputting.

[0088] Step 92: The high-speed AD conversion circuit performs continuous sampling on the pulse signal output by the shaping amplifier circuit and outputs it after conversion.

[0089] Step 93: Perform amplitude calculation on the digital signal waveform output by the high-speed AD conversion circuit by the fast peak-seeking and discharge control circuit, store after the amplitude calculation is completed, and output a discharge control signal to the signal fast recov...

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Abstract

The invention discloses a pulse amplitude measurement circuit and method for reducing counting losses. The related circuit includes: a shaping amplifier circuit, which is used to widen the random pulse signal output by the nuclear detector into a pulse shape with a flat top that is convenient for amplitude measurement, and Amplify the signal amplitude and output; high-speed AD conversion circuit, used to continuously sample the pulse signal output by the forming amplifier circuit and convert it into digital output; fast peak-seeking and discharge control circuit, used for high-speed AD conversion circuit output Calculate the amplitude of the digital signal waveform, store it after the amplitude calculation is completed, and output the discharge control signal to the signal fast recovery circuit; the signal fast recovery circuit is used to control the forming amplifier circuit according to the received discharge control signal The amplitude of the output pulse returns to the baseline level. The circuit and method disclosed by the invention can reduce the counting rate loss caused by the accumulation effect of the nuclear pulse signal under the condition of high counting rate, and the circuit structure is simple and reliable, and is easy to popularize.

Description

technical field [0001] The invention relates to the technical field of nuclear pulse signal amplitude measurement, in particular to a pulse amplitude measurement circuit and method for reducing count loss. Background technique [0002] The pulse amplitude measurement method of the digitized nuclear pulse signal is to first shape and amplify the signal, then continuously sample the signal through the ADC (Analog-to-Digital Converter), and then digitize the sampled data through logic devices such as FPGA (Field Programmable Gate Array) The amplitude of the pulse signal is obtained by peak-seeking processing; and then the random signal is counted and accumulated according to different amplitude values ​​to obtain the amplitude spectrum of the random pulse signal. The more precise the amplitude measurement, the higher the resolution of the amplitude spectrum. The higher the occurrence frequency of the random pulse signal, the higher the average count rate of the measurement, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/02
Inventor 陈炼刘宇哲梁福田李锋金革
Owner UNIV OF SCI & TECH OF CHINA
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