The attenuation of X-ray through the object is non-linear and the gray level of image is non-linear response of object thickness.

射线穿过物体的衰减是非线性的，经过影像系统得到的图像灰度与物体厚度是非线性的关系；

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A new technique for measuring large displacement of object by non-contact optical method is presented. The method is called as single-grating double-image method.

提出了一种非接触光学法——单光栅双图像法测量物体大位移的新技术。

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A new technique for measuring large displacement of object by non-contact optical method is presented. The method is called as single-grating double-image method.

提出了一种非接触光学法——单光栅双图像法测量物体大位移的新技术。

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