Prism-grating-prism imaging system

Abstract

The invention discloses a prism-grating-prism spectrum imaging system which is integrated with the imaging technology and the light-splitting technology and has the direct vision property. The imaging system is mainly composed of a collimator objective, a prism-grating-prism (PGP) light-splitting element and an imaging objective. The prisms of the PGP light-splitting element are in an axisymmetric distribution, the light incident angle and the light diffraction angle on the grating meet the bragg conditions of grating; the collimator objective and the imaging objective are in a four glass system structure, the object space and the image space meet telecentric optical paths, and the surface of a receiver has mean illunication. The system has the advantages of higher light energy transmission, favorable imaging quality, direct vision, small volume, easy carrying, high spectral resolution and easy processing, assembly and adjustment. All the lenses or prisms are made of common domestic common glass, so the mass production cost is reduced. The imaging system can be used in the spectral cameras in the field of biomedicine, and also can be made into a civil hyper-spectral imaging system such as a pen type spectroscope and the like.

Description

technical field [0001] The invention relates to a spectral imaging system integrating imaging and spectroscopic technology, in particular to a spectral imaging system with direct vision. Background technique [0002] Imaging spectrometer combines the two long-established technologies of optical imaging and spectral spectroscopy, so that it can simultaneously obtain the spatial image of the object and rich spectral information, and has the advantage of integrating the spectrum. Since the 1980s, it has been paid great attention by scientific research institutions in various countries, and has been widely used in land, atmosphere, ocean and other observations on aviation and spacecraft. [0003] Spectroscopic technology mainly includes optical filters, prisms, binary optical elements, interference spectroscopic and other methods, among which prism or grating spectroscopic is a traditional and relatively mature spectroscopic method. In traditional prism or grating spectrometers...

AI Technical Summary

Problems solved by technology

In the imaging spectrum system provided by it, the apex angles of the two prisms of the PGP element are different, the diaphragm of the system is placed near the grating, and the collimating objective lens and the imaging objective lens are three glass structures. Therefore, the whole system is still not compact enough, length and Large volume, the required pixel size is 23 microns × 23 microns, the imaging quality of the spectrometer is limited to a certain extent

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