Two-component three-field infrared optical system and field conversion method thereof

Abstract

The invention relates to a two-component three-field infrared optical system and a field conversion method thereof. The system comprises a detector, convergent lens sets, reflex reflective mirror sets, a fixed lens set, a compensation lens set, a zoom lens set, and a front-set infrared objective lens. The zoom lens set or the compensation lens set axially moves to realize conversion of narrow, middle and wide fields. Three fields of the zoom lens set and the compensation lens set can be achieved by use of the zoom principle of an optical compensation method, and the complex degree of a mechanism adopting a three-component or four-component system to achieve three fields is greatly simplified. High optical axis precision and high optical transmittance of the optical system are ensured, the complex degree of the mechanism is greatly simplified, and the infrared three fields are enabled to have high imaging quality and effect simultaneously. Mutual conversion of wide, middle and narrow optical fields can be realized by moving only one set of lenses. The in-place precision of the lens sets is high, and the in-place time is short. The optical axes of different fields are highly consistent. The control is simple, the reliability is high, and the motion mechanism is simple.

Description

technical field [0001] The invention belongs to the technical field of infrared optics, and relates to a two-element three-field infrared optical system based on an optical compensation method and a field-of-view conversion method thereof. Background technique [0002] The optical compensation method zoom system is to keep the position of part of the lens in the optical system unchanged, and the other part of the lens group used for variable magnification and compensation is relatively fixed together by a mechanical method, and this part of the lens group moves along the optical axis according to a certain rule. Change the focal length of the optical system. [0003] According to the zoom theory of optical compensation method, for imaging an object at infinity, if there are n intervals in the optical compensation zoom optical system composed of separate lens groups, there will be image planes with n focal lengths in the same position. [0004] To use the optical compensatio...

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Problems solved by technology

[0007] The object of the present invention is to provide a two-element three-field infrared optical system and its field-of-view conversion method to solve the problem of low positioning precision, long time in place, and different The problems of poor consistency of the field of view optical axis, complex control, low reliability, and complex motion mechanism; at the same time, it can solve the problem of using a three-component or four-component optical compensation method to realize a three-field optical system, because there is a fixed group in the middle of the moving group. Causes complex mechanism design, large load on the control system, and difficult control problems

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