高速多通道γ射线工业CT数据采集系统  

Data Acquisition System with High Speed and Multi-channel for γ-ray industrial CT

作　　者：高富强[1,2] 陈晟飞[2] 戴正国[3] 安康[1] 

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 [2]重庆大学自动化学院 [3]中国人民解放军63867部队

出　　处：《核电子学与探测技术》2011年第7期742-746,共5页Nuclear Electronics & Detection Technology

基　　金：重庆市自然科学基金项目(CSTC2009BB2360)

摘　　要：为满足γ射线工业CT的高速多通道数据采集要求,设计了针对性的高速数据采集系统实现数据的采集和处理。γ射线转换为放大的电流信号后,经信号处理电路进行放大、甄别、分频处理,然后信号经FPGA计数单元整理后传送到主控FPGA。主控FPGA作为控制核心,对配置为Slave FIFO工作模式的USB2.0内部的FIFO进行控制,数据通过块传输方式传输到上位机进行图像重建。为了现场采集的实际需求,系统的计数单元可以扩展,以实现更多通道的数据采集。实验结果表明:系统传输速度快,约为35 MB/s;并且最多可以扩展11片计数单元,采集1 024通道的数据。能够满足γ射线工业CT数据采集传输高速要求。In order to meet the requirements of high speed and multi-channel of data acquisition for γ-ray industrial CT,a data acquisition system of high speed is designed to collect data with high speed.γ-ray is transformed into current signal.Then,the signal is sent to circuit of signal processing to be amplified,filtered and frequency-division.The signal,processed by FPGA counting units,is transmitted to main controlling FPGA.Finally,USB2.0 interface chip works in the slave FIFO mode,and transmits data to host computer for image reconstruction under the bulk transmission mode.Main controlling FPGA is the control core,which controls the FIFO in USB2.0.What＇s more,FPGA counting units can increase,to acquire more channels＇ data in work space.Experimental results indicates that the transmission rate is high,which can reach 35 MB/s,and the system can add 11 FPGA counting units and acquire 1 024 channels＇ data at most.So that,it can satisfy the system requirements of rapid speed for γ-ray industrial CT.

关 键 词：γ射线工业CT 数据采集 FPGA USB2.0 SLAVE FIFO 

分 类 号：TP274.2[自动化与计算机技术—检测技术与自动化装置] TP391[自动化与计算机技术—控制科学与工程]