| 基于实时数字脉冲处理技术的核谱仪研究 |
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| 引用本文： | 周建斌,胡云川,洪旭,陈铁光,陈宝,岳爱忠,何绪新.基于实时数字脉冲处理技术的核谱仪研究[J].原子能科学技术,2015,49(12):2272-2276. |
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| 作者姓名： | 周建斌 胡云川 洪旭 陈铁光 陈宝 岳爱忠 何绪新 |
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| 作者单位： | 1.成都理工大学 核技术与自动化工程学院，四川 成都610000；2.山东省科学院 海洋仪器仪表研究所 山东省海洋环境监测技术重点实验室，山东 青岛266001；3.成都中核高通同位素股份有限公司，四川 成都610041；4.中国石油集团测井有限公司，陕西 西安710032 |
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| 摘 要： | 本文提出一种基于80 MHz ADC的数字化γ能谱系统。系统由探测器、前端电路、ADC和数字处理单元组成。数字处理在FPGA中完成,主要包括FIR数字滤波、脉冲梯形成形、幅度甄别、数据通讯。为减小高速ADC在采集过程中引入的噪声信号,在数字处理单元实现FIR数字滤波,对数字脉冲信号先进行滤波处理,再进行脉冲梯形成形,得到高分辨率的能谱数据。测量系统中模拟信号全部采用直流耦合,数字脉冲宽度为1.6μs,对137 Cs的能量分辨率达6.88%。
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| 关 键 词： | 核脉冲信号 FIR数字滤波 脉冲梯形成形 80 MHz采样率 |
Study of Nuclear Spectrometer Based on Real-time Digital Pulse Process Technique |
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| ZHOU Jian-bin,HU Yun-chuan,HONG Xu,CHEN Tie-guang,CHEN Bao,YUE Ai-zhong,HE Xu-xin.Study of Nuclear Spectrometer Based on Real-time Digital Pulse Process Technique[J].Atomic Energy Science and Technology,2015,49(12):2272-2276. |
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| Authors: | ZHOU Jian-bin HU Yun-chuan HONG Xu CHEN Tie-guang CHEN Bao YUE Ai-zhong HE Xu-xin |
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| Affiliation: | 1.College of Nuclear Technology and Automation Engineering, Chengdu University of Technology,Chengdu 610059, China; 2.Shandong Provincial Key Laboratory of Ocean Environment Monitoring Technology,Institute-of-Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao 266001, China;3.Chengdu Gaotong Isotope Co., Ltd., Chengdu 610041, China;4.China National Petroleum Corporation Logging, Xi’an 710032, China |
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| Abstract: | A digital gamma ray spectrometer based on 80 MHz ADC was presented. The system consists of NaI(Tl) detector, front-end circuitry, 80 MHz ADC and digital pulse process (DPP) unit. The FIR digital filtering, pulse trapezoidal shaping, pulse height discrimination and data communication were implemented in DPP. The pulse trapezoidal shaping algorithm was applied to obtain good energy resolution and throughout. In order to reduce the influence of noise introducing from the high-speed ADC, the FIR digital filter was employed. The digital signal coming from ADC was smoothed by FIR filter firstly, and then shaped as trapezoidal pulse for further processing. The analog signal was coupled by DC, and the digital pulse width is 1.6 μs. The results show that the resolution for 137Cs can reach 6.88%. |
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| Keywords: | nuclear pulse signal FIR digital filter pulse trapezoidal shaping 80 MHz sampling rate |
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