射线源图像诊断系统光学参数优化设计

Optimization design of optical parameters of image diagnosis system for pulsed radiation source

射线源图像诊断系统由闪烁体、镜头和ICCD相机组成,变焦镜头的焦距可以根据成像需要连续调节。然而,焦距的改变会同时影响系统成像放大倍数及工作距离。本文针对一定尺寸闪烁体的成像需求,由理论公式出发,推导出变焦镜头焦距、放大倍数、工作距离之间的数学关系,结合物距与像距难以测量的客观实际,给出了一种半经验的镜头焦距、物距和像距的设置方法,为射线源图像诊断系统的光学参数设置提供理论依据和实践指导。

Image diagnosis system for radiation source is made up of a scintillator,a camera lens and an ICCD camera.Zoom lens can change the focus continuously.However,magnification and working distance are also changed that affects the resolution.This article gives out the relationship between three parameters.Besides,optical parameters design method for scintillator of different size is revealed.Results set a good foundation in theory for image diagnosis system establishment.