Spectral resolution adjustable interference imaging spectrometer

Abstract

The invention relates to a spectral resolution adjustable interference imaging spectrometer which comprises a front telescopic system, a polarizer, two identical Wollaston prisms, an analyzer, an imaging mirror and a plane array detector which are sequentially arranged in a same optical path. Crystal optical axes of a left wedge plate of a first Wollaston prism and a right wedge of a second Wollaston prism are parallel to incident planes of the prisms and perpendicular to a principal optical axis of the optical path, and crystal optical axes of a right wedge plate of the first Wollaston prism and a left wedge of the second Wollaston prism are perpendicular to the crystal optical axis of the left wedge plate of the first Wollaston prism, the crystal optical axis of the right wedge of the second Wollaston prism and the principal optic axis of the optical path. The interference imaging spectrometer is adjustable in spectral resolution, and the adjusting range of the spectral resolution is wide. By means of the interference imaging spectrometer, as for different detection objects, only useful spectroscopic data are acquired so that requirements for multiple-target and multitask spectrum image detection can be met, occupancy of memory space and communication bandwidth can be substantially reduced, data processing time can be effectively reduced, signal to noise ratios of systems are increased, and overall performances of the instrument can be optimized.

Description

technical field [0001] The invention relates to an interference imaging spectrometer, in particular to an interference imaging spectrometer with adjustable spectral resolution. Background technique [0002] Imaging spectroscopy technology is an advanced optical detection technology developed in the 1980s that can simultaneously acquire the target image and the spectral information of each point on the image, and the acquired data is called "data cube" [Sellar R G, Boreman G D2005Opt. Eng.44013602.]. The instrument that does this is called an imaging spectrometer. According to different spectrum acquisition principles, imaging spectrometers can generally be divided into four types: dispersion type, interference type (Fourier transform type), filter type, and computed tomography type. Among them, the most widely used are dispersion type and interference type. The dispersion type uses prism or grating as the dispersion element to obtain the target spectrum, which has the adv...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of fixed spectral resolution and insufficient system performance of dispersive and static interferometric imaging spectrometers, the present invention uses two identical Wollaston prisms to laterally cut the target light source into two virtual light sources at infinity, And there is a certain amount of transverse shear between the two light sources, and then through the imaging mirror imaging, interference occurs on the focal plane, so as to obtain the target spectrum and image data, and realize the real-time, high spectral resolution (adjustable) detection of the target

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