Method for adjusting primary and secondary reflectors of Cassegrain optical system

Abstract

An adjustment method for primary and secondary reflectors of a Cassegrain optical system is disclosed. The invention belongs to the optical adjustment technology and particularly relates to the adjustment method for primary and secondary reflectors of the Cassegrain optical system. The method comprises the steps of adjusting the primary reflector, adjusting the secondary reflector, and adjusting the distance between the primary and secondary reflectors. According to the technology provided by the invention, on one hand, a process spherical surface is designed for the secondary reflector, and the centering adjustment of the secondary reflector is converted into the centering adjustment of a lens, so that the limitation of the working principle of a center deviation measuring instrument is avoided, and the technology is suitable for the high-precision adjustment of an aspheric reflector. On the other hand, the distance between the primary reflector and the secondary reflector is accurately measured by using the non-contact measurement function of the center deviation measurement instrument. The method is universally suitable for optical systems of visible light, infrared light and other wave bands, and the adjustment efficiency is high.

Description

technical field [0001] The invention belongs to the optical adjustment technology, in particular to a method for installing and adjusting primary and secondary mirrors of a Cassegrain optical system. Background technique [0002] The Cassegrain optical system has the advantages of large aperture, long focal length, wide spectral band, easy lightweight, strong temperature adaptability, etc., and is widely used in aerospace, military and other fields. The Cassegrain optical system consists of two mirrors, the primary mirror is a concave aspheric surface, and the secondary mirror is a convex aspheric surface. The axes of the two mirrors are arranged on the optical axis. pass. The adjustment quality of the primary and secondary mirrors of the Cassegrain optical system will greatly affect the imaging quality of the entire system. Therefore, the primary and secondary mirror adjustment technology of the Cassegrain optical system is one of the research hotspots in the field of opt...

AI Technical Summary

Problems solved by technology

Among them, the center deviation measuring instrument is a relatively common installation and adjustment equipment due to its high measurement accuracy and high installation and adjustment efficiency. However, since the center deviation measuring instrument can only measure the center deviation of the spherical surface, it cannot measure the optical axis deviation of the aspheric surface. Therefore, in the case of accumulated errors in optical parts and structural parts, the adjustment accuracy is limited, and it is often difficult to meet the adjustment accuracy requirements of the high-precision Cassegrain system

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