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高能闪光照相中网栅相机的性能分析
Performance analysis of anti-scatter grid camera in high energy flash radiography
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摘要: 针对闪光照相基本布局，从照相物理过程出发，确立网栅相机下含各种物理参量的成像公式。为了获得尽量简化的成像公式，采用数值模拟和理论分析方法，探讨了网栅相机在抑制噪声、散射和模糊等方面的能力及其使用方法。结果表明：网栅相机不仅具有灵敏度高、降散射能力强和模糊小的特点，采用有/无陡坡准直器和客体的两次照相可以获得主要含光源模糊的透射率图像，极大减少了图像分析中的不确定性因素。Abstract: Based on the radiographic physics,the imaging formula with various physical quantities is presented for the basic layout of flash radiography with the anti-scatter grid camera.Before reducing the formula,the role of the anti-scatter grid camera is discussed through numerical simulation and theoretical analysis in limiting X-ray scatter and noise and blur,and the radiograph-ic method with the anti-scatter grid camera is explored.It is shown that the anti-scatter grid camera is provided with high sensi-tive,little scatter and high resolution.Therefore,the formula of the transmission image with only the point spread function of X-ray source can be obtained through twice radiographing with/without the graded collimator and object.
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