实时测量的X射线针孔相机信号强度估算

 对用X射线CCD作测量设备的在线针孔相机信号强度进行了估计。利用激光原型装置柱腔能谱曲线、PI-SX1300型号X射线CCD的量子效率曲线分别对在CCD加Be滤片和加不同材料的平面镜两种情况下的针孔相机成像获得的Ｘ射线信号在CCD上的信号强度计数进行了估算，结果表明：厚度不大于200 μm的Be滤片只能将信号强度的计数降低一个量级；3°入射的金平面镜，5°入射的镍、碳平面镜和硅平面镜虽然也可将信号强度计数降低一个量级，但这两种衰减方法得到的强度计数超过了CCD的饱和计数值。计算了不同厚度的Be滤片结合平面镜的针孔相机对信号强度计数的衰减情况，结果表明：Be的厚度在20～40 μm时，平面镜选择3°入射的金平面镜或者5°入射的镍平面镜，两者结合可以较好地衰减信号。

Estimation of signal intensity for online measurement X-ray pinhole camera

The signal intensity was estimated for on-line measurement X-ray pinhole camera with CCD as measurement equipment. The X-ray signal intensity counts after the attenuation of thickness-varied Be filters and different material flat mirrors respectively were estimated using the energy spectrum of certain laser prototyper and the quantum efficiency curve of PI-SX1300 CCD camera. The calculated results indicate that Be filters no thicker than 200 μm can only reduce signal intensity by one order of magnitude, and so can Au flat mirror with 3° incident angle,Ni, C and Si flat mirrors with 5° incident angle, but the signal intensity counts for both attenuation methods are beyond the saturation counts of the CCD camera. We also calculated the attenuation of signal intensity for different thickne