Ultra-compact snapshot type polarization spectrum imaging detection device and detection method

Abstract

The invention discloses an ultra-compact snapshot type polarization imaging detecting device and a detecting method. The detecting device comprises a lens array and a detector which are successively arranged in an incident light direction. A polarizing interferometer is arranged between the lens array and the detector or is arranged in front of the lens array. The polarizing interferometer comprises a line polarizer, a single-wedge-shaped birefringence prism with a wedge angle of beta and a line analyzer. The transmission directions of the line polarizer and the line analyzer are same and areat an angle of 45 DEG to the quick axis direction of the single-wedge-shaped birefringence prism. The line polarizer is arranged in front of the single-wedge-shaped birefringence prism. The light sensing surface of the detector is in the back focal plane of the lens array. The detector of the detecting device can acquire an interference image array of different corresponding light path differencesin one exposure period, thereby realizing no requirement for sampling of interference images which are symmetric relative to a zero light path difference. The number of the interference images is farsmaller than the sampling number required for satisfying a Nyquist's theorem. Spatial resolution is improved, and a polarization spectrum image with high spectrum resolution can be reconstructed by means of a compressed sensing algorithm.

Description

technical field [0001] The invention belongs to the technical field of optical remote sensing detection, in particular to a spectral imaging device and detection method for spectral radiation detection. Background technique [0002] The electromagnetic wave radiated by an object contains spectral information that changes with the spatial position, which can be used to invert the shape and physical and chemical characteristics of the target. Spectral imaging technology is a cutting-edge remote sensing technology that simultaneously acquires spectral information of two-dimensional space targets. It has certain potential for improving the efficiency and accuracy of target detection, identification and classification. Forecasting, atmospheric detection, astronomical observation, machine vision bionics, biomedical diagnosis and many other fields will have important application value and prospects. [0003] Spectral imaging technology can be divided into two categories according ...

AI Technical Summary

Problems solved by technology

Compressed sensing technology can increase the number of spectral channels while maintaining large spatial resolution, but the required compressed sensing spectral system has a complex structure and requires sophisticated coding components

Interferometric spectral imaging technology is mainly based on the Fourier transform spectroscopy reconstruction algorithm, which has the advantages of multi-channel high-throughput and high signal-to-noise ratio; however, due to the need to generate a symmetrical interferogram about zero optical path difference, and the sampling of optical path difference requires Satisfies the Nyquist sampling theorem, the number of samples is large, and the resolution of the restored spectrum depends on the number of optical path difference samples and the maximum optical path difference, which leads to the complexity of the required interferometer device

The polarization interferometer has a relatively compact structure and is increasingly used in interference imaging spectroscopy systems; however, the birefringent elements in the current polarization interferometer require at least two combinations, resulting in complex structures and difficult processing , not economical

[0007] It can be seen that it is difficult to realize the spectral imaging technology with the advantages of simple and compact structure, economical benefits, and high resolution at the same time through a single approach.

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