【摘要】 介绍一种计数式辐射扫描成像系统。这种计数式辐射成像系统除量子噪声外,不受电子学噪声影响,可以降低测量剂量和增大系统本身的动态范围。比较适于检测预应力梁等厚密物体。用蒙卡模拟对系统的对比度进行了分析,并设计了一种高集成度的计数式辐射成像系统的数据获取和传输电路。更多还原

【Abstract】 A Counting Type Radiation Scanner for pre-stressed concrete girder imaging is presented. The contrast of counting type radiation scanner is only affected by quanta noise and has no relationship with the electronics noise. The dosage can be therefore reduced and the dynamic range can be extended. The result of Monte Carlo simulation for contrast evaluating, and a simple but advanced data acquisition design based on FPGA and DSP, are described.更多还原