Imaging spectrometer optical splitting system based on single free curved surface

Abstract

The invention discloses an imaging spectrometer optical splitting system based on a single free curved surface. The system is composed of an entrance slit, a free curved surface reflecting mirror, plane blazed grating and an image surface. The system is characterized in that one non-rotational symmetric free curved surface reflecting mirror is used for two times to act as a collimating mirror and an imaging mirror respectively, and plane blazed grating which is high in performance and mature in processing technology is used cooperatively so that the spectrometer optical splitting system which is simple and compact in structure, small in aberration, low in distortion and high in efficiency is realized. According to the embodiment of the imaging spectrometer optical splitting system based on the single free curved surface, great spectral imaging is realized in 400-1000nm visible near-infrared spectrum so that spherical aberration, coma aberration, astigmatism, spectral distortion and spectral line bending are greatly corrected under the premise that the system is ensued to be simple and compact. The imaging spectrometer optical splitting system based on the single free curved surface can be applied to the field of hyper-spectral imaging of spaceflight and aviation.

Description

technical field [0001] The invention belongs to the field of imaging spectrometer design, and specifically relates to the optical design of a novel imaging spectrometer spectroscopic system based on a single free-form surface and a planar blazed grating. The spectrum of the embodiment of the invention is in the visible and near-infrared, and it is also suitable for short-wave infrared and short-wave infrared. Design of spectroscopic components for spectral imaging systems such as thermal infrared and other spectral bands. Background technique [0002] Imaging spectrometer is an organic combination of imaging technology and spectral technology. It can simultaneously obtain two-dimensional spatial information and one-dimensional spectral information of the target to form a data cube, which is widely used in social production, military activities, space and astronomical exploration, and aerospace. remote sensing and many other fields. Its optical system is generally composed o...

AI Technical Summary

Problems solved by technology

[0005] In addition, other spectrometer splitting systems based on planar gratings generally increase the degree of freedom of the balance system by adding components. The system is relatively complex and requires the introduction of multiple sets of lenses or prisms. The slight inclination and eccentricity of each prism or lens will give The image quality of the system will have a serious impact, which will inevitably lead to difficulties in the installation and testing of the entire system, long development cycle and high development costs.

In addition, the light has to go through multiple refractions and reflections to reach the detector. Each refraction and reflection will bring about the loss of light energy, which will inevitably lead to low utilization of light energy in the system.

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