基于NIM系统的多道脉冲幅度采集卡设计

Design of Multi-channel Pulse Amplitude Acquisition Card based on NIM System

比较了计算机多道脉冲幅度分析系统与NIM(Nuclear I nstrument Module)多道脉冲幅度分析系统各自的特点,并介绍了后者的构架及其工作原理。对峰值展宽电路进行了功能分析和指标测试,并用NIM多道脉冲幅度采集卡进行了实际数据获取,从测得数据绘制出了脉冲幅度谱,其半高宽约为0.075%。在经过长达200多个小时的运行测试中,由该多道脉冲幅度采集卡与上位PC机组成的NIM数据获取系统工作稳定,已能初步满足小规模多参数数据获取系统的要求。

It mainly analyzed the characteristics of multi-channel pulse amplitude acquisition analysis system based on the computer and Nuclear Instrument Module（NIM） standards respectively.The latter architecture was introduced,and its working principle was described.After the function analysis and indicators test for the peak stretch circuit,stretched waveforms were given with the AFG3252 as the pulse generator.According to the results of the measured data processing,the pulse amplitude spectrum was drawn out,and its FWHM（Full Width at Half Maximum） was about 0.075%.After running for more than 200 hours,it has been proved that the NIM data acquisition system composed by the multi-channel pulse amplitude acquisition card and the host PC was stable and it can be met the requirements of small-scale multi-parameter data acquisition systems preliminarily.