Double-diffraction-level Offner imaging spectrometer

Abstract

The invention discloses a double-diffraction-level Offner imaging spectrometer and belongs to the technical field of hyperspectral imaging. The double-diffraction-level Offner imaging spectrometer comprises an Offner convex grating spectral imaging system and a dual-waveband area array photoelectric detector. The dual-waveband area array photoelectric detector is formed by coaxially stacking or parallelly manufacturing and interlacing two kinds of photosensitive elements responding wavebands. Primary diffraction light and secondary diffraction light are adopted by optical gratings in the spectral imaging system simultaneously to be used as effective work levels; the photoelectric detector receives the corresponding primary diffraction light and secondary diffraction light respectively at the same time. According to the double-diffraction-level Offner imaging spectrometer, the dual-waveband area array photoelectric detector is used for being matched with optical grating double-diffraction-level spectrum bands, simultaneous detection of the primary diffraction wavebands and secondary diffraction wavebands is achieved, the working spectral region of the spectrometer is enlarged, and diffraction efficiency is improved; it is facilitated that the overall polarization sensitivity of the spectrometer is reduced; according to the dual-waveband area array photoelectric detector, the light path structure is simplified, the spectrometer size and weight are reduced, and alignment of space dimension pixels of two wavebands and alignment of primary and secondary diffraction frequency doubling wavelengths are automatically achieved.

Description

technical field [0001] The invention belongs to the technical field of hyperspectral imaging, and relates to an Offner imaging spectrometer using dual-band detectors and double-diffraction order co-channel detection. Background technique [0002] The Offner convex grating spectral imaging system is developed on the basis of the reflective Offner relay optical system. It replaces the convex mirror in the Offner relay optical system with a convex diffraction grating to achieve dispersion and separation of divergent polychromatic beams. The Offner convex grating spectral imaging system has the advantages of simple structure, small size, light weight, uniform dispersion, weak spectral line bending and small color distortion. Traditional grating-type wide-band imaging spectrometers generally use a color splitter to first divide the polychromatic light into two different bands, and then use two independent dispersive optical path systems to process them separately; or use a common...

AI Technical Summary

Problems solved by technology

Due to the need to achieve wide-spectrum and long-line dispersion imaging on the focal plane, it increases the difficulty of correcting off-axis aberrations in the spectral dimension, which limits the improvement of spectral resolution; at the same time, the double-sided blazed grating has a longer In the interval, the diffraction efficiency is only maintained between 10% and 20%.

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