Blocking piece based on scene temperature non-uniformity correction and light path

Abstract

The invention relates to a blocking piece based on scene temperature non-uniformity correction and a light path. A parallel flat plate diffractive optical element with focal power is adopted as a non-uniformity correction blocking piece of an infrared system based on the principles of diffractive optics and geometrical optics. When the parallel flat plate diffractive optical element with focal power is used for infrared system non-uniformity correction, the parallel flat plate diffractive optical element with focal power can change the object distance position of an infrared lens, the object distance, which is located at infinity, of the normally imaged infrared lens is converted into an air layer with a long limited distance in a non-uniformity correction state, the air layer is imaged ona focal plane of the infrared detector through the parallel flat plate diffractive optical element with focal power and the infrared lens, then non-uniformity correction is carried out, the temperature of the air layer represents the actual temperature of an outdoor scene, and non-uniformity correction based on the scene temperature is achieved.

Description

technical field [0001] The invention belongs to the field of optical technology, and relates to a baffle based on scene temperature non-uniformity correction and an optical path used. Background technique [0002] Infrared detection technology is a thermal detection technology that works in the infrared band (medium wave: 3-5 μm, long-wave: 8-12 μm) and uses the difference and difference in the radiation temperature of different objects in the scene. It can work in day and night and in fog and haze Under adverse weather conditions such as , smog, sand and dust, it can greatly expand the visual performance of the human eye. [0003] The core of infrared detection technology is a variety of infrared detectors that convert the received thermal radiation of the scene into electrical signals. Although the photosensitive elements on the same infrared detector focal plane array are made of the same material, due to the inhomogeneity of the production material and the difference in...

AI Technical Summary

Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a baffle and optical path based on scene temperature non-uniformity correction, and uses a parallel plate diffractive optical element with optical power as the design of the infrared non-uniformity correction baffle, which realizes The non-uniform correction based on the scene temperature solves the problem of uneven temperature of the baffle itself and the large difference between the correction temperature and the scene temperature, and improves the image quality of the infrared system

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