Application of pole-zero cancellation circuit in nuclear signal filtering and shaping algorithm

查看全文 作　　者：Huai-Ping [1,3]Wang;Jian-Bin [1]Zhou;Xiao-Ping [2]Ouyang;Xian-Guo [1]Tuo;Xu [1]Hong;Yi [1]Liu;Jie [1]Yu;You-Xian [1]Jin

机构地区：[1]College of Nuclear Technology and Automation Engineering,Chengdu University of Technology,No.1 East 3 Road,Erxian Bridge,Chenghua District,Chengdu 610059,China;[2]Northwestern Institute of Nuclear Technology,Xi’an 710024,China;[3]Engineering Research Center of Nuclear Technology Application(East China University of Technology),Ministry of Education,Nanchang 330013,China

出　　处：《Nuclear Science and Techniques》索引2021年第32卷第8期,共10页

基　　金：supported by the National Natural Science Foundation of China(Nos.11975060,12005026,and 12075038);the Fund of Robot Technology Used for Special Environment Key Laboratory of Sichuan Province(No.19kftk02)。 摘　　要：In radiation measurement and digital nuclear spectrum systems,traditional nuclear signal processing circuits in nuclear electronics have been gradually replaced by digital algorithm modules with the application of highperformance programmable hardware logic devices(such as FPGA or DSP).Referring to the digital realization method of inverse RC integral circuit systems,the function of the pole-zero cancellation(PZC)circuit was analyzed,a new modified cascade equivalent model of PZC was established,and the time-domain digital PZC(DPZC)recursive algorithm was derived in detail in this study.Two parameters kIand k_(D)are included in the new algorithm,where kIshould match the exponential decay time constant of the input signal to realize the pole-zero compensation,while the decay time constant of the output signal can be changed with the adjustable parameter k_(D)(which is larger than the decay time constant of the input signal).Based on the new DPZC algorithm module,two trapezoidal(triangular)shaping filters were designed and implemented.The amplitude–frequency characteristics of the output signal of the proposed trapezoidal shaping algorithm and the convolution trapezoidal shaping algorithm were compared,with fixed peaking time.The results show that the trapezoidal shaping algorithm based on DPZC can better suppress high-frequency noise.Finally,based on the Na I(Tl)scintillator(u75 mm×75 mm)detector and^(137)Cs source,the effect of the k_(D)value on the energy resolution of the DPZC trapezoidal(triangular)shaping algorithm was studied.The experimental results show that,with an increase in k_(D),the energy resolution of the system improved and reached the maximum when k_(D)was greater than 10,and the optimal energy resolution of the system was 7.72%. 关键词：Pole-zero cancellation C–R inverse system Trapezoidal/triangular shaping Amplitude–frequency characteristics Energy resolution

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Application of pole-zero cancellation circuit in nuclear signal filtering and shaping algorithm

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