Spectrum polarization detection device and method for synchronous polarization modulation interference imaging

Abstract

The invention discloses a spectrum polarization detection device and a method for synchronous polarization modulation interference imaging. The spectrum polarization detection device comprises a preposed polarization imaging system, an image plane interference imaging spectrometer and a signal processing system which are arranged on the same optical axis in sequence. Incident light forms four groups of light beams with different polarization state information through a polarization element and the light beams are separated on a space of a back focal plane of a microlens array. The separated light beams shoot into a lateral cutting beam splitter after passing through a collimator objective lens and are divided into two crosswise, and optical path difference information is brought in. Two branches of emergent light passes through a postpositional imaging objective lens, a target image with interference information and polarization state information is obtained on a target face of a detector, and the target image is transformed into an electrical signal and enters a signal processing system. Fourier transform is carried out, and light intensity information, spectral information and complete Stokes polarization information of a two-dimensional space of each target point are obtained. The spectrum polarization detection device for synchronous polarization modulation interference imaging has the advantages of being high spectral resolution, high in signal to noise ratio and simultaneous in complete Stokes polarization information and can be used for spectrum detection of a narrow band or a wide band.

Description

technical field [0001] The invention relates to an optical target detection method, in particular to a synchronous polarization modulation interference imaging spectral polarization detection device and method. Background technique [0002] In the process of target detection, the surface state, physical and chemical properties of the target can be retrieved from the spectral and polarization information of the object, and even the background noise can be effectively eliminated to enhance the visibility of the object. Since the spectral and polarized radiation characteristics of the target have the advantage of clearly reflecting the characteristics of the target, the imaging detection technology that fuses spectral and polarization information can effectively use the complementarity of the two, and significantly improve the ability of the target to be effectively identified in a complex background environment. The Imaging Spectropolarimeter (ISP) technology developed from th...

AI Technical Summary

Problems solved by technology

These two methods can obtain the full Stokes polarization information of the target, but they have to go through two Fourier transforms, and the processing process is more complicated.

In 2006, the University of Arizona introduced the Oka phase delay component on the basis of tomographic imaging spectroscopy technology, which can obtain all polarization information and spectral information in a single detection, and has real-time detection capabilities, but the data processing process is complicated and the spectral resolution is low.

However, when detecting narrow-band target spectra, using multi-channel interference imaging spectroscopy technology, there may be serious aliasing between the interference information corresponding to each polarization state, which will affect the accuracy of the restored spectrum

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