Method for optical image despun through using isosceles prism

Abstract

The invention discloses a method for optical image despun through using an isosceles prism. The method includes the following steps that: the first waist surface of the isosceles prism is irradiated with an incident light beam, the optical axis of the incident light beam being parallel to the bottom surface of the isosceles prism; the isosceles prism rotates the light beam irradiated onto the first waist surface by 180 degrees, so as to obtain a rotated light beam, and the optical axis of the rotated light beam being parallel to the optical axis of the incident light beam; and the rotated light beam is irradiated to an imaging optical system. According to the method of the invention, the isosceles prism is adopted to rotate the incident beam irradiated onto the first waist surface by 180 degrees so as to obtain the rotated beam; the rotated beam is irradiated onto the imaging optical system, so that a stable and non-rotated image can be obtained, and optical image despun is realized; and the isosceles prism has the advantages of small size, light weight, capacity of compressing an optical path, simple processing and adjustment process and the like, and therefore, the problems of large size and difficult processing and adjustment of a K-mirror, the problems of large size and large weight of a Dove prism and the problem of the unsuitability of a Pechan prism for a parallel optical path in existing optical image despun methods can be solved.

Description

technical field [0001] The invention belongs to the field of optical technology, in particular to a method for eliminating image rotation by using an isosceles prism. Background technique [0002] The photoelectric system can find the target and provide corresponding environmental target information. This kind of system usually adopts the method of rotating the scanning device around the optical axis to obtain spatial information in all directions and a large field of view. This scanning method will cause the vertical line of the object space to not maintain a constant angle with the detector, and the reflection image will be generated along the optical axis. Rotation, that is, the image formed on the detector will rotate with the scanning of the mirror. In order to obtain a stable image without rotation, an anti-rotation device must be added to the system. Commonly used optical derotation devices include K mirrors, Dove prisms, Beham prisms, etc. The K mirror is composed...

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Problems solved by technology

[0003] The embodiment of the present invention provides a method for derotation using an isosceles prism, which is used to solve the problems in the existing derotation method that the K mirror is large in size, difficult to process and adjust, the Dove prism is long and relatively heavy, and the Beham prism is not suitable. Parallel light path and other issues

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