Catadioptric hybrid multispectral imaging system

Abstract

The invention discloses a catadioptric hybrid multispectral imaging system, which comprises a primary mirror, a catadioptric dual-purpose secondary mirror, a wedge-shaped dichroic beam splitter, a medium wave or long wave infrared or medium-long wave infrared dual-waveband imaging mirror assembly, a medium wave or long wave infrared or medium-long wave infrared dichroic detector unit, a visible to near infrared waveband imaging mirror assembly, a visible to near infrared waveband beam splitting device and a detection unit thereof, a short wave infrared waveband imaging mirror assembly, and a short wave infrared waveband beam splitting device and a detection unit thereof, wherein a hole is formed at the center of the primary mirror, and the reflecting surface of the primary mirror is a concave surface; and the incident surface of the catadioptric dual-purpose secondary mirror is a convex surface. The system can realize imaging with common field of view and common aperture of a same object, improve the utilization rate of light energy, save space for the beam splitter and the system, prevent parasitic light from directly leaking into the imaging mirror assembly from the hole formed on the primary mirror, correct asymmetric aberration, be more conductive to realizing large aperture and the larger field of view and significantly improve the imaging quality. The imaging with the same optical axis and the common field of view can enable an image to be easy to register.

Description

technical field [0001] The invention relates to a multispectral imaging system, in particular to a reflective hybrid multispectral imaging system. 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 bands can be obtained through the rotation of the color filte...

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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