基于FPGA的数字多道脉冲幅度分析器设计

摘要

Digital multi-channel pulse height analysis becomes the mainstream of multi-channel analysis technology. A digital multi-channel analyzer (DMCA) based on a single FPGA chip is introduced. The nuclear signals are processed by EP3C40Q240. Ft uses digital signals acquired by ADC to do calculus, seek the peaks, discriminate the threshold, and then form the energy spectrum. DMCA communicates with the RS485 bus interface. The software on PC can control DMCA and display energy spectrum. And the energy spectrum of Cs is given, which is obtained from Nal( Tl) detector and processed by DMCA.%数字化多道脉冲幅度分析成为多道分析技术的主流,介绍了一种基于单FPGA芯片的数字脉冲幅度分析器的设计.采用EP3C40Q240作为数字核信号处理器,将ADC采集到的核信号进行数字积分、寻峰、阈值检测等数字处理,并得到能谱.系统通过高速RS485接口实现数字多道与上位机能谱分析软件的通信.最后给出了由NaI(T1)探测器得到的核信号经数字多道处理后获得的137Cs能谱图.