Spectral imaging method and spectrum imaging instrument of snapshot-type high throughput

Abstract

The invention relates to a spectral imaging method and a spectrum imaging instrument of a snapshot-type high throughput, which aim at realizing a picture-type photograph. The spectrum instrument comprises a linear gradient filter array and an optical-field imaging mechanism, and the optical-field imaging mechanism comprises a primary mirror, a micro lens array and a detector. The filter array is arranged on an aperture diaphragm between lenses of the primary mirror, the filter array consists of a plurality of filters which have identical width and are arranged at intervals, and the filter is a linear gradient filter band with continuous spectrum. The micro lens array is arranged on an imaging surface of a front-mounted optical imaging system, and the detector is arranged on a focus plane of the micro lens array. The spectrum imaging method is characterized in that light in different directions transmitted or reflected by a target is imaged on one micro lens after being modulated by the primary mirror and the filter array, the light is dispersed by the micro lens onto a picture element of the detector to form a subimage, and finally three-dimensional spectrum image data is obtained. The complete spectrum image information of the target can be obtained through the photograph in one step, and the spectral imaging method and the spectrum imaging instrument can be used for monitoring and tracking a rapid variable or movable target.

Description

technical field [0001] The invention relates to optical imaging technology, in particular to a spectral imaging method and a spectral imager for realizing frame-style photography by utilizing light field imaging technology based on microlens arrays and linear gradient filter dispersion. Background technique [0002] Traditional dispersive or interferometric imaging spectroscopy techniques require at least some scanning method to obtain the spatial and spectral information of the target scene, and cannot simultaneously obtain complete image spectral information within one exposure, thus limiting the monitoring of fast-moving or changing targets by imaging spectrometers and other applications. In addition, the scanning motion of this type of imaging spectrometer has high requirements on the motion accuracy and stability of the push-broom platform or its own scanning mechanism, and is easily affected by external shocks such as vibration, thus increasing the processing difficult...

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages: (1) The luminous flux of the pinhole array is low, which increases the exposure time and cannot be applied to fast-changing or moving targets; (2) The physical diffraction spot of the pinhole array is large, and the utilization rate of the detector pixel is low.

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