X射线背散射电信号采集电路设计与研究  

作　　者：高永涛 熊志辉 高志军 

机构地区：[1]中广核贝谷科技有限公司,南昌330096

出　　处：《科技创新与应用》2024年第25期129-132,共4页Technology Innovation and Application

摘　　要：X射线背散射成像仪是一种基于康普顿散射效应,采用射线探测与成像技术的辐射成像检查仪器。在X射线背散射成像仪的研制中,一套可以准确获取散射射线信息的电信号采集电路是背散射成像仪获得高质量图像的关键。为了设计出更加适合X射线背散射成像仪使用的电信号采集电路,该文针对X射线背散射成像仪中康普顿散射射线特征,提出电信号采集电路的2种设计方案,一种是采用脉冲计数模式,另一种是采用电荷积分模式。根据设计方案,该文分析不同采集电路设计方案的影响因素,并将2种方案分别进行电路设计、硬件参数优化调整和电信号采集对比测试实验。对比测试实验表明,电荷积分模式信号采集方案可以有效提升采集电路辐射信号采集率,提升X射线背散射成像仪的关键指标和成像质量,更加适用于背散射成像仪,从而实现X射线背散射成像仪电信号采集电路优化设计与模块化应用。X-ray backscatter imaging device is a kind of radiation imaging instrument based on Compton scattering effect and using X-ray detection and imaging technology.In the development of X-ray backscatter imaging device,a set of electrical signal acquisition circuit which can accurately obtain scattered ray information is the key for backscatter imager to obtain high quality images.In order to design an electrical signal acquisition circuit which is more suitable for X-ray backscatter imaging device,according to the characteristics of Compton scattered rays in X-ray backscatter imaging device,two design schemes of electrical signal acquisition circuit are proposed in this paper.One is pulse counting mode,the other is charge integration mode.According to the design scheme,this paper analyzes the influence factors of different acquisition circuit design schemes,and carries on the circuit design,hardware parameter optimization adjustment and electrical signal acquisition contrast test experiments of the two schemes.The comparative test results show that the charge integration mode signal acquisition scheme can effectively improve the radiation signal acquisition rate of the acquisition circuit,improve the key index and imaging quality of the X-ray backscatter imaging device,and is more suitable for the backscatter imager.Thus,the optimal design and modular application of the electrical signal acquisition circuit of X-ray backscatter are realized.

关 键 词：X射线背散射成像仪 电路设计 计数模式 积分模式 理论分析 

分 类 号：TL81[核科学技术—核技术及应用]