高能X射线数据采集系统研究  

Study on high energy X-ray detection and data acquistion system

作　　者：张平[1] 蒋阳[2] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室ICT研究中心,重庆400030 [2]重庆大学通讯工程学院,重庆400030

出　　处：《计算机工程与设计》2011年第7期2505-2508,2513,共5页Computer Engineering and Design

基　　金：国家自然科学基金项目(60672098)

摘　　要：为了克服传统的射线探测方案在高能X射线工业CT的探测与数据采集系统中的弊端,分析了高能X射线探测技术,并重点研究了高能X射线探测器——钨酸镉(CdWO4)耦合光电二极管探测器的探测原理及其信号输出特征。根据探测器信号的输出特性,研究了微弱电流信号的测量原理,详细介绍了高能X射线探测转换电路的设计,并重点介绍了微弱信号探测系统的前置放大电路、主放大电路以及一种新的应用于工业CT的高低压分区放大电路的设计。In order to overcame shortcoming of conventional the ICT data acquisition system （DAS） designing method, high energy X ray detect technology is analyzed, and the detect principle and the output signal＇ s characteristics of the high energy X ray detector - CdWO4 coupled with photodiode are researched in detail. After researching the output signal＇ s characteristics of the detector, the principle of low level current signal measurements is studied. Particularly the high energy X ray detecting and converting circuit design is introduced, at last the front amplify circuit, main amplify circuit and a newly designed circuit for the ICT system are expounded in detail, which amplify voltage by deviating voltage into two sections.

关 键 词：工业CT X射线探测 动态范围 现场可编程门阵列FPGA 数据采集 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]