基于FPGA的数字多道脉冲幅度分析器

发布时间：2018-11-13 09:20

【摘要】：核能谱测量系统是测量射线能量的仪器。多道脉冲幅度分析器是核能谱测量系统的关键部件,直接影响着核能谱测量系统的性能的好坏。本文根据核辐射探测器输出信号的特点以及γ射线能谱测量的要求,设计多道脉冲幅度分析器。多道脉冲幅度分析采用”前端电子学线路+数字信号处理部分”的技术方案。在此基础上,对以下几个方面的关键技术做了详细的研究:(1)前端电子学线路是由前置放大器与谱仪放大器组成。首先,通过对前端电子学线路进行理论研究提出设计方案。其次,根据经验对设计方案进行进一步完善。最后,通过软件仿真与实验相结合的方法来最终验证设计方案的可行性与有效性。(2)数字信号处理部分采用“ADC+FPGA+USB”的技术方案。根据系统的具体需求,选择合适的芯片,设计各个部分的硬件电路,并按照系统的总体设计方案将各个部分组合起来,搭建基于FPGA的数字信号处理的硬件平台。(3)软件部分要完成FPGA内的程序设计和USB固件的设计。本文采用自顶向下、模块化的设计思想完成对峰值提取,成谱等逻辑功能模块的程序设计。在上述研究工作的基础上,逐步完成多道脉冲幅度分析器的硬件和软件设计并进行测试。测试结果表明,使用本文研制的多道脉冲幅度分析器实现的γ射线核能谱测量系统有着较好的能量分辨率和更好的系统稳定性,满足核能谱测量系统的使用需求。
[Abstract]:The nuclear energy spectrum measurement system is an instrument for measuring the energy of rays. Multi-channel pulse amplitude analyzer is a key component of nuclear energy spectrum measurement system, which directly affects the performance of nuclear energy spectrum measurement system. A multi-channel pulse amplitude analyzer is designed according to the characteristics of the output signal of the nuclear radiation detector and the requirement of 纬 ray energy spectrum measurement. The multi-channel pulse amplitude analysis adopts the "digital signal processing part of front-end electronic circuit". On this basis, the following key technologies are studied in detail: (1) the front-end electronic circuit is composed of a preamplifier and a spectrometer amplifier. First of all, through the theoretical research on the front-end electronic circuit, the design scheme is put forward. Secondly, the design scheme is further improved according to the experience. Finally, the feasibility and validity of the design scheme are finally verified by the combination of software simulation and experiment. (2) the "ADC FPGA USB" technical scheme is adopted in the digital signal processing part. According to the specific needs of the system, select the appropriate chip, design each part of the hardware circuit, and according to the overall design of the system, each part will be combined together. Build the hardware platform of digital signal processing based on FPGA. (3) the software part should complete the program design of FPGA and the design of USB firmware. In this paper, a top-down, modular design idea is used to complete the program design of the peak extraction, spectrum and other logic function modules. On the basis of the above research work, the hardware and software design and test of the multi-channel pulse amplitude analyzer are completed step by step. The test results show that the 纬 -ray nuclear energy spectrum measurement system developed in this paper has better energy resolution and better system stability, and meets the requirements of the nuclear energy spectrum measurement system.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN791;TL816

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