As an indispensable component in gamma-ray spectrum measurement,the performance of the multichannel analyzer directly affects the spectrum analyzer's resolution and measurement accuracy.Traditional multichannel analyzers often use analog circuit or digital acquisition cards for implementation.Multichannel analog analyzers have certain limitations in shaping time,pulse throughput rate,and dead time correction,which directly impact spectrum analysis results.On the other hand,digital acquisition cards,although capable of digital acquisition,But the manufacturing cost is high and it is not conducive to market promotion.Multichannel digital analyzer performs full digital sampling of pulse signal and converts it into digital quantities.The digital signal processing method realized by software improves system stability and reliability,presenting clear advantages compared to the aforementioned methods.In this paper,the design scheme of multichannel digital analyzer was proposed.The system consists of ARM processor,high-speed ADC,and FPGA,including AD sampling module,FPGA data processing module,and control and communication module with STM32F4 as the core.The key pulse processing algorithms such as pulse signal filtering,amplitude extraction,and baseline correction were realized.The gamma-ray spectrum processed by the multichannel digital analyzer designed in this paper is displayed.Based on domestic and research achievements and theoretical foundations,method simulation validation,and practical debugging,the commercially viable,complete,and high-precision digital multichannel analyzer was developed.It was applied to low-background gamma-ray spectrometer,and the performance parameters such as energy resolution,energy linearity,and integral nonlinearity were tested.The multichannel digital analyzer based on the ARM+FPGA combination significantly reduced system design complexity and costs.But has high-precision,high-speed digitalization of pulse signals,with performance comparable to digital acquisition cards.The analyzer exhibits tremendous market application value.
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