Three-branch large-view-field PGP imaging spectrometer

Abstract

The invention relates to a three-branch large-view-field PGP imaging spectrometer, relates to the technical field of imaging spectrums, and solves the problem that an existing PGP imaging spectrometer is low in slit length and cannot adapt to large-range spectrum detection. A hyperspectral camera comprises a front telescope group, a slit, a reflex lens group, a collimating lens group, a prism-grating-prism (PGP) light splitting element group, a focusing lens group, a camera and a lens barrel. Polychromatic light carrying target information is converged by the front telescope group and gated by the slit and then is divided into three parts by the reflex lens group, the three parts enter three light splitting branches respectively, and finally the spectrum of a target is obtained on the camera; different incident angles of light rays on a light splitting element can cause spectrum bending, so that the precision of spectrum detection is influenced, and the magnitude of the spectrum bending is in positive correlation with the length of the slit. According to the PGP imaging spectrometer, the spectrum bending on each camera is reduced in a mode of dividing the slit into three parts, so that restriction of the spectrum bending on the length of the slit is reduced, and the field of view of the PGP imaging spectrometer is enlarged.

Description

technical field [0001] The invention relates to the technical field of imaging spectroscopy, in particular to a three-branch large-field PGP imaging spectrometer. Background technique [0002] Based on the spectral analysis theory of matter, spectral imaging technology combines spectral and imaging technology to obtain spatial information, radiation information and continuous spectral information of dozens or hundreds of bands of ground objects. Based on spectral imaging technology, hyperspectral imaging spectrometer realizes comprehensive detection, perception and recognition of target characteristics, greatly expands the target recognition and monitoring capabilities of remote sensing detection technology, and is widely used in resource detection, environmental monitoring, criminal identification, etc. various fields. [0003] PGP spectrometer is a new type of imaging spectrometer, which inherits the characteristics of strong spectral resolution and linear dispersion of g...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a three-branch PGP imaging spectrometer with a large field of view to solve the problems that the existing PGP imaging spectrometer has a small field of view, large spectral curvature, and the slit length of the PGP spectrometer is generally small and cannot adapt to wide-range spectral detection.

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