Stokes Modulated Fourier Transform Polarization Imaging Spectrometer

The Stokes-modulated Fourier transform polarimetric imaging spectrometer addresses the limitations of current systems by using double refractive crystals and multi-level mirrors for real-time multi-dimensional data capture, improving target recognition through integrated image, spectral, and polarization data acquisition.

CN116105863BActive Publication Date: 2025-07-15CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202310181668.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-02-28
Publication Date
2025-07-15
Estimated Expiration
2043-02-28

AI Technical Summary

Technical Problem

The existing polarization imaging spectral detection technology is less studied in the infrared band, and time-sharing detection cannot obtain transient information in all dimensions in real time. Partial amplitude detection leads to huge system volume and weight, and traditional Fourier transform infrared spectroscopy technology has limitations in reliability and stability.

Method used

Birefringent crystals are used as high-order phase retarder for polarization modulation, combined with the phase modulation interference technology of multi-stage micromirrors, polarization image field conversion is carried out through polarization beam splitter and quarter wave plate to achieve efficient utilization of light field energy, and synchronous measurement is carried out through interference map extraction, channel filtering and Fourier transform.

Benefits of technology

The synchronous measurement of infrared images, spectral and polarization information is realized. The system has a compact structure, high stability, easy to miniaturize and integrate, and enhances the accuracy of target recognition and detailed feature extraction.

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Abstract

The present invention provides a Stokes modulation Fourier transform polarization imaging spectrometer, comprising: a telescopic system, a polarization modulation system, a converging system, a polarization interference system and an imaging system; the target light field emitted by the target scene is incident on the telescopic system, and after passing through the telescopic system, the target light field is collimated into a parallel light field and incident on the polarization modulation system; the parallel light field is subjected to polarization modulation by a high-order phase retarder to obtain a modulated light field, and then a linearly polarized light field is obtained after passing through a polarizer, and the linearly polarized light field is incident on the converging system; the converging system is used to converge the linearly polarized light field and then incident on the polarization interference system to obtain a polarization interference image; by performing a step scan on the target scene, each field point of the target scene sequentially traverses each step of the multi-level micromirror to obtain a polarization interference image data cube; by extracting the interferograms of each field point and performing a Fourier transform, the spectral information of each Stokes parameter in each field is finally demodulated.
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