High resolution infrared imaging optical system and imaging method

Abstract

The invention discloses a high resolution infrared imaging optical system. The system comprises a front optical system, a filter system, a microlens array, a back set optical system and a detector focal plane array which are sequentially arranged along an optical axis, wherein the microlens array is arranged on a back focal plane of the front optical system, the filter system is a flat lens provided with multiple shadow areas and transparent areas, the microlens array and the filter system are parallel, the microlens array comprises multiple microlenses which are spliced together, the detector focal plane array comprises multiple image elements which are spliced together, the image elements, the microlenses and the transparent areas correspond to each other in one-to-one mode, and a modulation system is further arranged between the optical system and the filter system. The invention further discloses an imaging method. The system is advantaged in that the structure is simple, the system is easy to process, high resolution infrared imaging can be realized without any motion part, super large aperture angles can be realized, the system is particularly suitable for infrared wave bands, and a problem of low resolution of an infrared imaging system in the prior art can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of infrared optical imaging, and in particular relates to a high-resolution infrared imaging optical system and an imaging method. Background technique [0002] In many applications, it is necessary to capture high-resolution images, so that more detailed information of the target scene can be obtained. In order to obtain more target information, the usual solution is to use an optical system with a longer focal length. However, under certain conditions, the field of view of the optical system will also decrease as the focal length increases; on the other hand, if an optical system with a very large field of view is used, the resolution of the target will inevitably be reduced. It is more prominent in infrared imaging system. At present, the resolution of infrared detectors is generally much lower than that of visible light detectors. The pixel size of infrared detectors is usually above 10 μm at present, ...

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Problems solved by technology

However, under certain conditions, the field of view of the optical system will also decrease as the focal length increases; on the other hand, if an optical system with a very large field of view is used, the resolution of the target will inevitably be reduced. More prominent in infrared imaging systems

At present, the resolution of infrared detectors is generally much lower than that of visible light detectors. The pixel size of infrared detectors is usually above 10 μm at present, while the pixel size of visible light can reach 2 μm. Compared with visible light imaging, infrared imaging in It will be more difficult to obtain high-resolution images while ensuring a large field of view

For example, in the case of a field of view of 30 degrees, to achieve an angular resolution of 0.2mrad requires a detector resolution of about 2620*2620. Visible light detectors with this resolution are very common, but especially for infrared detectors For long-wave infrared detectors, it is still difficult to achieve stable

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