Off-axis catadioptric medium-long wave infrared system based on concentric double-spherical reflector

Abstract

The invention belongs to the field of optical imaging, and provides an off-axis catadioptric medium-long wave infrared system based on a concentric double-spherical reflector aiming at the requirements of an infrared band on a large-view-field, low-distortion and high-imaging-quality optical system. The method is mainly applied to the fields of satellite-borne large-range medium-resolution meteorological observation and the like. The system sequentially comprises a first spherical reflector, a second spherical reflector, n groups of folding axis mirrors and n groups of imaging compensation lens groups in the light propagation direction; the system is an off-axis system; the n groups of imaging compensation lens groups are distributed at the light emitting part of the second spherical reflector in a fan shape; one group of diaphragms, one group of folding shaft lenses and one group of imaging compensation lens groups form an independent imaging channel; incident light is reflected by the first spherical reflector, the second spherical reflector and the folding axis mirror in sequence, passes through each diaphragm and then vertically enters the compensation lens group of the corresponding imaging channel. The optical system has the characteristics of high imaging quality, large imaging view field, full-view-field constant ground element resolution, capability of working in an infrared band and the like.

Description

technical field [0001] The invention belongs to the field of optical imaging, and in particular relates to an off-axis catadioptric mid- to long-wave infrared system based on concentric double-spherical mirrors. It is mainly used for space-borne large-scale medium-resolution meteorological observation, and can also be used in urban security monitoring, national land census, disaster prevention and mitigation and other fields. Background technique [0002] Satellite ocean remote sensing plays an important role in the observation and research of the global marine environment and marine resources. It is characterized by rapid, continuous, large-scale and simultaneous observation of multiple parameters. A number of meteorological satellites have been launched around the world to detect oceans. The main remote sensor includes a visible light multispectral scanning radiometer, which is characterized by high sensitivity and signal-to-noise ratio, wide scanning field of view, and sm...

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Problems solved by technology

Although the above patents are different in content, they all have in common the concentric multi-scale design based on concentric spherical lenses

[0005] At present, more and more application environments require large field of view, low distortion, and high-resolution imaging in the infrared band. However, due to the low transmittance of infrared materials, it is difficult to apply the multi-scale optical system scheme based on concentric spherical lenses to the infrared band.

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