Mutually-visual-field common-aperture multi-spectral imaging system with Cassegrain front end

Abstract

The invention discloses a mutually-visual-field common-aperture multi-spectral imaging system with a Cassegrain front end. The system comprises a main lens, a refracting-reflecting dual-purpose secondary lens, a medium wave or long wave infrared or medium-long wave infrared dual-waveband imaging lens group, a medium wave or long wave infrared or medium-long infrared double-color detector unit, a visible to near infrared band imaging lens group, a visible to near infrared band color analyzer and a detection unit, wherein the main lens is provided with a central opening; the reflecting surface of the main lens is a concave surface; and the incident surface of the refracting-reflecting dual-purpose secondary lens is a convex surface. In the system, the main lens is taken as a public entrance pupil of each waveband and primary light splitting is realized by using the secondary lens, so that the luminous energy utilization ratio is increased, the spaces of a spectroscope and the system are saved, the realization of a long aperture and a large visual field is facilitated, and the imaging quality is improved remarkably. Due to the adoption of co-optical-axis mutually-visual-field imaging, images are easy to register.

Description

technical field [0001] The invention relates to a multi-spectral imaging system, in particular to a common-field-of-view and common-aperture multi-spectral imaging system with a Cassegrain type front end. Background technique [0002] The multi-spectral imaging system uses the spectral characteristics of the object to achieve the purpose of identifying the object and understanding the nature of the object by receiving images of different spectral bands of the target object. , pests, water pollution, marine ecology, fire, mineral analysis and monitoring, etc. [0003] The multispectral imaging system needs to simultaneously image the same target in multiple spectral segments, and its optical structure can be divided into the following types: [0004] One is the single-lens single-detector color filter wheel type. The color filter wheel can hold multiple color filters of different bands, and its spectral response can be selected by the user. The images of several spectral ban...

AI Technical Summary

Problems solved by technology

[0006] The third is the single-lens multi-CCD spectroscopic type, such as the MS4100 system launched by DuneanTech in the United States. Because the light-transmitting materials used in different spectral bands are different, the optical structures used to correct aberrations are also different.

Therefore, some designs make the primary and secondary mirrors constitute a telescope system, that is, the secondary mirror emits parallel light, so that the oblique plate does not produce asymmetrical aberrations, but this method will make the central opening of the primary mirror larger, making the noise outside the field of view The light is not reflected by the primary and secondary mirrors and directly leaks into the rear imaging mirror group through the opening, causing stray light noise on the image surface, and additional loads are required to reduce or eliminate stray light

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