本文将正交光栅干涉仪的条纹箱分离,获得两个方向上的条纹箱.对于由N个分立点组成的物体,从两个条纹箱可以得到由N~2个点组成的像.其中N个点是物的格实像点,N(N—1)个是交叉项点.将光栅干涉仪绕其对称轴转过一角度,得到第二个像.与第一个像相比,N(N—1)个交叉项点的空间位置发生了变化,而N个真实像点未变.因此,将这两个像相乘,即能消除交叉项点而获得真实像点.利用这一方法,给出了实验结果.

In this paper the second cross-grating of a cross-grating interferometer is replaced with two one-dimensional gratings and the two fringe boxes of x and y directions are separated. When an object is composed of N discrete points, the image, N2 points, can be obtained from the two fringe boxes, consisting of the N correct ones and N(N - 1) false reconstructions. The second image is obtained by rotating the cross-grating interferometer an angle about its axis of symmetry. Comparing the first image to the second, we discover that the N(N-1) false reoonstruotiong are different and the N oorrect image points are the same. By multiplying the two images, the false reoons—tmotions are eliminated and the correot ones are obtained. The experimental results are given.