Multi-view long-wave infrared zooming optical system and infrared thermal imager

Abstract

The invention discloses a multi-view long-wave infrared zooming optical system. The multi-view long-wave infrared zooming optical system comprises a doubling lens set, a front fixed lens, a moving lens set, a reflecting mirror set and a rear fixed lens set. The doubling lens set is formed by a first doubling lens and a second doubling lens, the moving lens set comprises a zooming lens set and a compensating lens, the zooming lens set is formed by a first zooming lens and a second zooming lens, the reflecting lens set is formed by a first reflecting mirror and a second reflecting mirror which are mutually perpendicular, the rear fixed lens set comprises a first rear fixed lens, a second rear fixed lens, a third rear fixed lens and a fourth rear fixed lens, and a detector assembly is arranged in the light emitting direction of the fourth rear fixed lens. The invention also discloses an infrared thermal imager comprising a supporting frame and the multi-view long-wave infrared zooming optical system. The multi-view long-wave infrared zooming optical system can achieve six shifts of focal length and field of view, the performance of the infrared thermal imager is greatly improved, and the multi-view long-wave infrared zooming optical system is relatively good in adaptability and practicality.

Description

technical field [0001] The invention belongs to an infrared imaging optical system, in particular to a switchable multi-field long-wave infrared zoom optical system and an infrared thermal imager using the long-wave infrared zoom optical system. Background technique [0002] At present, infrared thermal imaging products have made great progress. Due to their all-weather day and night observation capabilities, they are widely used in many fields such as monitoring, warning, surveillance, reconnaissance, and forest fire prevention. The infrared optical system is responsible for collecting external infrared energy radiation and focusing imaging, and is an indispensable and important part of infrared thermal imaging products. The zoom optical system can quickly change the focal length of the system within a certain range, and obtain different proportions of images and fields of view, so it has been widely used in infrared thermal imaging products. [0003] Existing infrared zoo...

AI Technical Summary

Problems solved by technology

[0005] 1. The focal length of the continuous zoom optical system changes continuously, and the zoom time from short focus to long focus is long, making it difficult to achieve fast zoom

[0006] 2. The continuous zoom optical system generally uses a cam mechanism to complete the movement of the moving mirror group. When the outer diameter of the mirror group is large, the cam parts will have problems such as difficult processing and large movement resistance.

[0008] 1. Since the zoom lens group of the multi-speed zoom optical system is cut into the light path, in order not to block the light, the zoom lens group cannot be set too much, generally one group, and a few are two groups, so that only two-speed zoom or three-speed zoom can be realized , it is difficult to achieve more fields of view

[0009] 2. Multi-level zoom optical system, the more the field of view, the more the number of lens groups, which increases the optical cost

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