High-flux wide-spectrum high-resolution coherent dispersion spectral imaging method and device

Abstract

The invention belongs to the field of spectral imaging, and relates to a high-flux wide-spectrum high-resolution coherent dispersion spectral imaging method and a high-flux wide-spectrum high-resolution coherent dispersion spectral imaging device. The high-flux wide-spectrum high-resolution coherent dispersion spectral imaging method comprises the steps of: firstly, subjecting target light to collimation and then dispersion; secondly, reflecting dispersed spectra to different positions of a space according to different spectral bands; thirdly, converging reflected light beams into a wide-angleMichelson interferometer to obtain interference fringes; fourthly, compressing the interference fringes in a direction perpendicular to the interference fringes and then lengthening the interferencefringes in a slit direction; fifthly, performing secondary dispersion on the interference fringes in the direction perpendicular to the interference fringes to obtain high-flux wide-spectrum and high-resolution spectral interference fringes; and finally, receiving an interference fringe image by means of a photoelectric detector. The high-flux wide-spectrum high-resolution coherent dispersion spectral imaging method and the high-flux wide-spectrum high-resolution coherent dispersion spectral imaging device solve the problems that the luminous flux is low, spectrum widening is limited by the size of a target surface of the photoelectric detector, the wider the spectral range, the poorer the fringe contrast, the signal-to-noise ratio of a single pixel of the photoelectric detector is reduceddue to high spectral resolution, the spectral lines are bent due to cross dispersion and the like in two traditional spectral imaging methods adopting a high-precision cross dispersion echelon grating spectrometer and a coherent dispersion spectrometer.

Description

technical field [0001] The invention belongs to the field of spectral imaging, and relates to a coherent dispersion spectral imaging method and device with high throughput, wide spectrum and high resolution. Background technique [0002] Spectral imaging technology combines spectral technology and imaging technology, and has been widely used in military, agriculture, medicine, aerospace, environmental monitoring, atmospheric detection, astronomical observation and other fields. Interference and dispersion technology are the most important technologies applied in the field of spectral imaging, but usually the two technologies are used separately, and only in the case of wind measurement, measurement of radial velocity of stars or planets, etc., will the two technologies be combined These techniques are combined to achieve a more ideal measurement accuracy. [0003] The traditional spectrometers that combine interference and dispersion techniques mainly include high-precision...

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Problems solved by technology

[0004] In order to solve the low luminous flux existing in the traditional high-precision cross-dispersion echelle grating spectrometer and coherent dispersion spectrometer, the spectral broadening is limited by the size of the photodetector target surface, the wider the spectral range, the worse the fringe contrast, and the high spectral resolution. The high-efficiency ratio will reduce the signal-to-noise ratio of a single pixel of the photodetector, and the cross-dispersion will cause spectral line bending. The present invention proposes a high-throughput, wide-spectrum, and high-resolution coherent dispersion spectral imaging method and device.

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