Nowadays many large aperture optical components are widely used in the high-tech area, how to test them become more
and more important. Here describes a new method to test the large aperture optical components using the small aperture
interferometer, deduce how to get the aperture number and the concrete process of the stitching parameter in a systematic
way, finally get the best plan to choose the sub-aperture of the square and circular optical plane. To specify the stability
of the method we operate an experiment, the result shows that the stitching accuracy can reach λ/10, it meet the need of
the inertia constraint fusion etc, that is good enough to be used in the high-tech area.
In the high accuracy absolute interferometry, several interferograms from different objects has to be calculated. This paper introduces a technique that ensures the spatial positions of the interferograms coinciding correctly (spatial unity). In this technique the characteristic parameters of interferograms’ position are picked up in the sample matrix coordinates system. And all these characteristic parameters are compared and fed back to the operator. Then the operator aligns the optical path precisely until it achieves the conditions for the absolute measurement. Computer guards the whole process, so the results are more reliability. The absolute measurement of cylindrical surface using this method has been realized and high-accuracy results are obtained.
A portable phase-shifted interferometer with multiply usages is described. Several techniques are studied and used in this interferometer. In order to test an optical piece with obscuration or irregular edge, we study the seed-algorithm for wavefront reconstruction. For testing a corner cube reflector (CCR), we investigate the model to calculate its exit wavefront and angle error. To measure the figure of a convex or concave spherical surface, we develop a series of reference transmission spheres.