System and method of measuring off-axis amount and off-axis angle of off-axis paraboloid main reflector

Abstract

The invention relates to a system and method of measuring an off-axis amount and an off-axis angle of an off-axis paraboloid main reflector. The system comprises an optical axis mark post A, an optical axis mark post B, an autocollimation theodolite A, an autocollimation theodolite B, an autocollimation theodolite C, an interferometer, a planar mirror and a small flat mirror. The autocollimation theodolite A, the optical axis mark post A, the optical axis mark post B and the autocollimation theodolite B are sequentially located on the same optical axis. The autocollimation theodolite B and the autocollimation theodolite C are located on the same optical axis. An off-axis reflector to be detected is placed between the autocollimation theodolite B and the autocollimation theodolite C. The small flat mirror is attached to the off-axis reflector to be detected. The focus of the interferometer and the focus of the off-axis reflector to be detected coincide. Spherical waves emitted by the interferometer are reflected by the off-axis reflector to be detected to form reflected light. The planar mirror is placed on the optical path where the reflected light resides. The invention provides the system and method of precisely measuring the off-axis amount and the off-axis angle of the off-axis reflector.

Description

technical field [0001] The invention belongs to the field of optical assembly, and relates to a measuring device and a measuring method, in particular to a system and a method for measuring the off-axis amount and off-axis angle of an off-axis parabolic primary reflector. Background technique [0002] Compared with the coaxial mirror, the off-axis mirror has two more important indicators, namely the off-axis amount and the off-axis angle. These two indicators reflect the deviation of the off-axis mirror from the optical axis of the parent mirror, that is, The offset of the off-axis mirror relative to the optical axis of the system. According to the structural characteristics of the off-axis optical system, the primary mirror usually has a larger diameter and is usually in the form of a parabola. For large-aperture off-axis mirrors, due to their large caliber, if the cutting method of separating the mother mirror is used for processing, the caliber of the master mirror will ...

AI Technical Summary

Problems solved by technology

Due to the many degrees of freedom of the off-axis optical system, there are many variables in the computer-aided adjustment process. If the initial positioning accuracy is too low, the line iteration equation will not converge, making it difficult to solve the misalignment of the off-axis optical system.

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