摘要
数字核脉冲信号的高斯成形,由于其实现简单、综合性能良好被广泛应用于数字核谱仪系统中。本文从Sallen-Key与CR-RCm电路的工作原理出发,推导了基于数字Sallen-Key与数字CR-RCm在时域中的高斯成形递推函数,分别获取Z 域中的传递函数,并对其幅频响应进行了分析。对实际采样核脉冲信号,分别采用数字Sallen-Key 与数字CR-RCm的递推函数实现了其高斯成形,随着成形参数的增加,成形结果越趋近于高斯形,成形脉冲也越宽。基于Si-PIN 探测器测量55Fe 射线源,获取不同高斯成形方法、不同成形参数下的能谱,结果表明:数字Sallen-Key表现出更好的能量分辨率性能,而数字CR-RCm表现出更好的计数率性能。
[Background] Gaussian shaping of digital nuclear pulse signals has been widely used in digital nuclear spectrometer systems due to its easy realization and good performance.[Purpose] This study aims to implement and analyze Gaussian shaping method for digital nuclear pulse signal, digital Sallen-Key and digital CR-RCm.[Methods] Based on the working principle of Sallen-Key and CR-RCm circuit, the Gaussian shaping recursive function was derived by digital technology. The transfer function in Z domain was obtained and its amplitude-frequency response was analyzed. Gaussian shaper was implemented by using the recursive function of digital Sallen-Key and digital CRRCm for the actual sampled nuclear pulse signal. Finally, based on the signal obtained by Si-PIN detector measuring 55Fe source, energy spectra using different Gaussian shaping methods and various shaping parameters were obtained.[Results] Comparisons of energy spectra shows that the shaping results tend to be Gauss distribution with the increase of shaping parameters, and the shaping pulse becomes wider.[Conclusion] The digital Sallen-Key exhibits better energy resolution performance whilst the digital CR-RCm exhibits better count rate performance.
作者
李卓岱
张怀强
刘进洋
颜苗苗
LI Zhuodai;ZHANG Huaiqiang;LIU Jinyang;YAN Miaomiao(Engineering Research Center of Nuclear Technology Application, East China University of Technology, Ministry of Education, Nanchang 330013, China;School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013,China)
出处
《核技术》
CAS
CSCD
北大核心
2019年第6期42-46,共5页
Nuclear Techniques
基金
国家自然科学基金(No.11665001、No.41864007)
国家留学基金委项目(No.201708360170)
江西省"百人远航工程"项目~~
