Double-zoom-section optical system applied to photoelectric detection field

Abstract

The invention relates to a double-zoom-section optical system applied to photoelectric detection field. The system is composed of an objective lens, a moving lens group, a fixed lens, an adjusting lens group, a detector light window and a detector focal plane. According to the core concept of the optical system, an optical interval between the adjustment lens group and the detector light window isadjusted through changing an optical interval between the fixed lens and the adjustment lens group, so that the combined magnification of the fixed lens and the adjustment lens group can be changed,and therefore, the zoom range of the optical system can be realized. According to the design of the system, aspherical surfaces and diffractive surfaces are adopted, so that high-order aberrations, on-axis and off-axis point aberrations, narrow-beam and wide-beam aberrations, and various chromatic aberrations are reduced, and satisfactory image quality can be obtained at different zoom sections within a full-field, full-aperture, and full-zoom range.

Description

technical field [0001] The invention belongs to a double zoom section optical system, in particular to a double zoom section optical system applied in the field of photoelectric detection. Background technique [0002] The continuous zoom thermal imager is an imaging system whose focal length can be changed continuously, while the position of the image plane remains stable and the image quality remains good during the zooming process. In order to obtain images of different sizes on the image plane of a fixed-focus infrared camera, the distance between the target object and the lens must be changed or a lens with a different focal length must be replaced. The continuous zoom thermal imager can continuously change the focal length of the system. Therefore, it can obtain target images of continuously changing sizes on the image plane, which is very beneficial for photoelectric detection, reconnaissance, and tracking. [0003] The usual continuous zoom lens has only one zoom se...

AI Technical Summary

Problems solved by technology

[0003] The usual continuous zoom lens has only one zoom segment. In actual use, if the zoom segment does not meet the needs of use, it is necessary to replace the continuous zoom lens with a different zoom segment. At this time, the system needs to be re-adjusted, which causes inconvenience to use.

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