An athermalized dual-field medium-wave optical system

Abstract

The invention relates to an athermal dual field-of-view medium wave optical system, comprising an objective lens 1, an objective lens 2, a zoom lens, an objective lens 4, an objective lens 5, an objective lens 6, an objective lens 7, an objective lens 8, an objective lens 9 and a detector focal plane, which are arranged coaxially along the light incident direction in sequence, wherein the objective lens 1, the objective lens 5, the objective lens 9 and the zoom lens are made of silicon, the objective lens 2, the objective lens 4, the objective lens 6 and the objective lens 8 are made of germanium, the objective lens 7 is made of ZnS, and the zoom lens can move axially along the optical axis to realize the switching of dual field of view. According to the athermal dual field-of-view medium wave optical system, the zoom lens moves axially to realize the switching of the dual field of view, so that a narrow optical field of view and a wide optical field of view are realized according to different use needs, the optical system is enabled to have higher optical axis accuracy, the weight of the optical system is light, and a movement mechanism is simple and easy to control; the thermal aberration caused by temperature difference can be subjected to compensation elimination through different thermal expansion coefficients of the optical components, so that the athermal design is realized, the focal power of the optical system can be reasonably distributed, the aberration of the optical system is effectively eliminated, and the imaging quality of the dual field-of-view optical system is accordingly improved.

Description

technical field [0001] The invention belongs to the technical field of viewing field switching of a medium-wave optical system, and relates to a medium-wave optical system with a thermal design and a dual-view field. Background technique [0002] Due to the harsh airborne environment, airborne equipment needs to work in different temperature environments. When the temperature changes, the lenses of the airborne optical system are prone to thermal expansion and contraction, which will cause the image quality of the optical system to decline or even fail to image. For this reason, the existing technology usually uses a focusing mechanism to compensate the image plane movement caused by temperature, so that the system imaging quality remains good, but the disadvantage is that the focusing mechanism increases the volume and weight of the instrument, and at the same time, the optical axis of the system is easy to move, which brings Aiming errors reduce the reliability of the sys...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an athermalized dual-field-of-view medium-wave optical system to solve the problem of increasing the volume and quality of the instrument caused by using the focusing mechanism to compensate the image plane movement caused by temperature, resulting in aiming errors, Problems that reduce the reliability of the system

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