The Method of Mounting and Adjusting the Primary and Secondary Reflectors of Cassegrain Optical System

Abstract

The invention relates to a method for installing and adjusting primary and secondary reflectors of a Cassegrain optical system, which belongs to the optical adjusting technology, and in particular relates to a method for installing and adjusting primary and secondary mirrors of a Cassegrain optical system. The method of the invention includes the steps of adjusting the main reflector, adjusting the secondary reflector, and installing and adjusting the distance between the primary and secondary reflectors. The technology of the present invention, on the one hand, converts the centering adjustment of the secondary reflector into the centering adjustment of the lens by designing a technical spherical surface for the secondary reflector, thereby avoiding the limitation of the working principle of the center deviation measuring instrument , making it suitable for high-precision adjustment of aspheric mirrors. On the other hand, the distance between the primary and secondary mirrors is accurately measured by using the non-contact measurement function of the center deviation measuring instrument. It is generally applicable to optical systems in various bands such as visible light and infrared, and has high installation and adjustment efficiency.

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...

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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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