HXMT高能主探测器探头地面测试设备研制

发布时间：2018-03-31 21:22

  本文选题：HXMT　切入点：FPGA　出处：《云南大学》2016年硕士论文

【摘要】：作为研究天体、认识宇宙的主要工具之一,天体X射线的探测一直是国内外研究的热门。但由于地球大气层对X射线的严重阻挡,X射线探测只能在外太空进行。硬X射线调制望远镜(HXMT)作为我国第一颗自主研制的X射线天文卫星,能够实现硬X射线的高分辨率成像,对于认识宇宙具有重要意义。HXMT高能主探测器探头(简称主探)为卫星主载荷,用于20～250 keV的硬X射线探测。主探在研制过程中需要配套电性能测设备,以便参与诸如热真空和热循环、力学振动等环境考核试验,以及大量的常规测试。由于主探采用NaI(T1)/CsI(Na)复合晶体,因此需要测试设备具备脉冲幅度分析(PHA)和脉冲波形甄别(PSD)功能,且要求设备便携,具备多通道采集和实时显示功能,目前市场上的设备均不能满足全部需求。为满足HXMT项目研制需求,本文开展了主探测器探头地面测试设备的设计工作,包括硬件电路设计和硬件代码编写。测试设备采用主、从双FPGA为核心,用高速A/D采样(采样周期10.4ns),32K×16的双端口RAM作缓存、USB接口作数据端口的设计,能够对8路脉冲信号(幅度0～5V,宽度0.1～10us)进行并行采集和处理,测量脉冲信号幅度和宽度,提取脉冲信号到达时间,实现PHA和PSD功能,并提供8个通道的0～4V直流电平(50mA)输出、8个通道的0～4V直流电平输入检测。经过实际测试,测试设备性能达到设计要求,并已成功运用于HXMT主探测器探头的电性测试。与MCA8000D相比,本测试设备同样具备小型、便携的特点,在能谱响应上与Amptek的MCA8000D相当,且较之具有多通道、PSD功能的优势。这些特点和优势使得设备在辐射探测领域具有更广泛的运用前景。
[Abstract]:As one of the main tools to understand the universe, X-ray detection of celestial bodies has been a hot topic at home and abroad.But X-ray detection in the Earth's atmosphere can only be done in outer space.As the first self-developed X-ray astronomical satellite in China, HXMTS can realize the high-resolution imaging of hard X-ray.It is of great significance to understand the universe. The HXMT high energy main detector (HXMT) is a satellite main load, which is used for hard X ray detection of 20 ~ 250 keV.In order to participate in the environmental tests such as thermal vacuum and thermal cycling, mechanical vibration and a large number of conventional tests, the main exploration needs to be equipped with electrical performance measurement equipment during the development process.Since the main detector uses the NaIN T1 / CsINa-Na composite crystal, it is necessary for the testing equipment to have the functions of pulse amplitude analysis (PHA) and pulse waveform discrimination (PSD), and it is required that the equipment be portable, with the functions of multi-channel acquisition and real-time display.At present, the equipment on the market can not meet the full demand.In order to meet the development requirements of HXMT project, the design of ground test equipment for main detector probe is carried out, including hardware circuit design and hardware code writing.The test equipment adopts the main and slave dual FPGA as the core, and uses the high-speed A / D sampling (the sampling period 10.4nsSU 32K 脳 16 RAM as the data port) to design the data port. It can collect and process the 8-channel pulse signal (amplitude 0 ~ 5V, width 0.1 ~ 10) in parallel.The amplitude and width of the pulse signal are measured, the arrival time of the pulse signal is extracted, the functions of PHA and PSD are realized, and the output of 8 channels is provided, and the input detection of 0V 4V DC level of 8 channels is provided.Through the actual test, the performance of the test equipment meets the design requirements, and has been successfully applied to the electrical test of the HXMT main detector probe.Compared with MCA8000D, the test equipment also has the characteristics of small and portable, and is comparable to Amptek's MCA8000D in energy spectrum response, and has the advantage of multi-channel MCA8000D.These characteristics and advantages make the equipment more widely used in the field of radiation detection.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P172
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本文编号：1692494