Spectrum imaging apparatus and spectrum imaging inversion method

Abstract

The embodiments of the invention disclose a spectrum imaging apparatus and a spectrum imaging inversion method. The spectrum imaging apparatus comprises a front mirror, a Hadamard transfer coding template, a first convergence mirror, a prism, a second convergence mirror and a detector. The front mirror gathers object spectrum cube radiation to form a parallel light field, the Hadamard transfer coding template modulates the light field, the first convergence mirror transmits the modulated light field to the prism, the prism performs dispersion on the modulated light field, and the second convergence mirror transmits the light field after dispersion is performed to the detector for imaging. According to the invention, the coding aperture of prism dispersion is improved, the feasibility of the spectrum imaging apparatus is enhanced, and the spectrum recovery of a multiband spectrum and large area array imaging is provided.

Description

technical field [0001] The invention relates to the field of imaging technology, in particular to a spectral imaging device and a spectral imaging inversion method. Background technique [0002] At present, the common spectral imagers include dispersion type, interference type, filter type, computed tomography type and diffractive optical element type, etc. The spectrometers applied to the principle of Hadamard transfer are mainly dispersion type, and the dispersion type can be divided into forms based on prism and grating, among which the dispersion type Hadamard imager using grating is the most prominent, such as figure 1 The coded aperture grating dispersive spectral imager shown in the figure uses a coded template with Hadar code transformation properties instead of the light through the slit in the conventional spectral imager to realize porous modulation of the optical information of the target space, which includes the front optical system, Hadar code change The codi...

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Problems solved by technology

[0003] The number of spectral bands that can be detected by the above-mentioned dispersion-type imaging spectrometer using a grating is often limited by the encoding order of the Hadar code transform (7th order, that is, 7 spectral bands); The location of the slit is also very accurate. Using the Hadam code transformation template will inevitably cause spectral aliasing of the imaging fringes in each band. If no correction is made and the spectral restoration algorithm is changed accordingly, the restoration result is not ideal. If prism dispersion is used, it will There are spectral line bending distortion of prism dispersion itself and nonlinear dispersion effect; at the same time, the spectral restoration schemes adopted are all aimed at the spectral restoration of small-area targets, but not for large-scale wide imaging, which affects the application range and timeliness of the Hadamard imager

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