Double-wedge dispersive shear interference hyperspectral imaging device and method

Abstract

The invention provides a dual-wedge-plate dispersion shearing interference hyperspectral imaging device and method. The device comprise a front optical device, a dual-wedge dispersion plate Sagnac horizontal shearing beam splitting system, an imaging system and a signal processing system. Incident light enters the front optical device, a target view field is determined, stray light is eliminated, and a collimated light beam is formed. The collimated light beam enters the dual-wedge dispersion plate Sagnac horizontal shearing beam splitting system, light is sheared in a horizontal mode, due to the dispersion effect of a dual-wedge plate, the shearing distance changes along with the optical wavelength, optical path difference information which changes along with the wave number is led to the imaging system, a target image with interference strips formed on a detector target face at the back focal plane of an imaging objective lens is obtained, the horizontal shearing beam splitting system or the overall system is rotated to obtain interference information of various target points under different optical path differences, the signal processing system carries out the fourier transformation on the interference information, and super-resolution spectral information and two-dimensional image information of various spectrum bands are obtained. The dual-wedge-plate dispersion shearing interference hyperspectral imaging device and method have the advantages of hyperspectral resolution, high luminous flux, and high target resolution.

Description

technical field [0001] The invention belongs to the field of optical imaging, and in particular relates to a double-wedge dispersion shearing interference hyperspectral imaging device and method, which can obtain two-dimensional image information of a target space and super-resolution spectral information of each point of the target. Background technique [0002] Imaging spectroscopy technology uses a combination of radiation imaging technology and spectral measurement technology to obtain the two-dimensional spatial radiation intensity information of the target and the spectral information of each point of the target. Among them, interference imaging spectroscopy technology is a new detection technology developed in the 1980s. It uses the Fourier transform relationship between interference information and spectral information to calculate the spectral information of the target and obtain the two-dimensional spatial information of the target. [0003] Compared with dispersiv...

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Problems solved by technology

In addition, spatial heterodyne interference spectroscopy technology is difficult to adopt the form of common optical path interference, and the beam incident on the diffraction grating is required to be strictly collimated light. Therefore, this method requires high precision of system optical components and is sensitive to interference sources.

Moreover, the spectral information obtained by this method overlaps, and complex methods are required to distinguish the spectral information before and after the detection center wavenumber

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