Full-Stokes interference imaging spectral device and method based on time-sharing polarization modulation

Abstract

The invention discloses a full-Stokes interference imaging spectral device and a method based on time-sharing polarization modulation. The full-Stokes interference imaging spectral device comprises a time-sharing polarization modulation device and a slit-free Sagnac interference imaging spectral device. The time-sharing polarization modulation device can be composed of a rotatable phase delayer and a fixed linear polarizer. The Sagnac interference imaging spectral device is composed of two imaging objective lens, a collimating objective lens, a Sagnac shear beam splitter, and an imaging detector. A target beam to be detected is incident on the time-sharing polarization modulation device to generate four different polarization states; after the target beam to be detected passes through the interference imaging spectral device, four groups of target images carrying different polarization state information and interference information are obtained on the target surface of the imaging detector; and through data processing, four-dimensional light information of a detection target scene is obtained ultimately, namely, two-dimensional spatial information, spectral information of each point, and full-Stokes polarization information of each spectrum. The full-Stokes interference imaging spectral device of the invention has the advantages of high luminous flux, high spatial resolution, and the like.

Description

technical field [0001] The invention belongs to the field of optical detection devices, and in particular relates to a full-Stokes (Stokes) interference imaging spectrum device and method based on time-sharing polarization modulation, which can obtain four-dimensional optical information of a detection target scene, that is, two-dimensional spatial information, various The spectral information of the point and the full Stokes polarization information of each spectral band. Background technique [0002] When the target is detected, the spectral and polarization information of the object can be used to invert the surface state, physical and chemical properties of the target, and can effectively eliminate background noise and enhance the visibility of the object. Imaging Spectropolarimeter (ISP) combines the functions of cameras, spectrometers and polarimeters to provide us with spatial, spectral and polarization information of the scene. The emergence of ISP technology has ef...

AI Technical Summary

Problems solved by technology

[0004] At present, there are mainly the following types of ISP technology (FTISP) based on interference imaging spectroscopy technology: one is based on multi-channel interference imaging spectroscopy polarization technology, which modulates different polarization states in the interference fringes at the same time, and a single detection can obtain full Stokes polarization parameter; when detecting narrow-band spectral signals, there may be aliasing between the interference fringes corresponding to each polarization state, resulting in a reduction in the accuracy of spectral restoration

Another method is the interference imaging spectral polarization technology based on the sub-aperture. The method of aperture division can introduce four sets of polarization information at the same time, but the spatial resolution of this method is low.

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