Pulse amplitude measurement circuit and method capable of reducing counting losses

Abstract

The invention discloses a pulse amplitude measurement circuit and method capable of reducing counting losses. Related circuits comprise a forming and amplifying circuit, a high-speed AD (analog-to-digital) conversion circuit, a quick peak searching and discharging control circuit and a signal fast-recovery circuit, wherein the forming and amplifying circuit is used for widening and forming random pulse signals output by a nuclear detector into pulse shapes which have flat tops and can facilitate amplitude measurement and outputting the signal amplitude after amplifying the signal amplitude; the high-speed AD conversion circuit is used for continuously sampling pulse signals output by the forming and amplifying circuit, converting the pulse signals into digital quantities and then outputting the digital quantities; the quick peak searching and discharging control circuit is used for performing amplitude calculation on waveforms of digital signals output by the high-speed AD conversion circuit, performing storage after amplitude calculation is finished, and outputting discharging control signals to the signal fast-recovery circuit; the signal fast-recovery circuit is used for performing control according to the received discharging control signals and recovering the amplitude of pulses output by the forming and amplifying circuit to the base line level. With the adoption of the circuit and the method, counting rate losses caused by the stacking effect of nuclear pulse signals under the condition of the high counting rate can be reduced, and the circuit is simple and reliable in structure and convenient 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...

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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 pea

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