Automatic device for compact multi-band and full-polarization imaging

Abstract

The invention relates to an automatic device for compact multi-band and full-polarization imaging. The automatic device for the compact multi-band and full-polarization imaging is characterized in that the automatic device comprises a lens fixing rack, a filter turning wheel, a 1 / 4 wave plate unit, a line polaroid unit, a collimation lens and a motor system. The motor system controls the filter turning wheel to gate a current wave band, the 1 / 4 wave plate unit and the line polaroid unit are rotated, and a control unit triggers a CCD to achieve shutter imaging. The polarization image of the current wave band is acquired, and the multi-band and full-polarization imaging is achieved by automatically rotating the filter turning wheel. According to the device, the filter turning wheel, the 1 / 4 wave plate unit, the line polaroid unit, stepping motors and the like are fixedly arranged on the lens fixing rack, the automatic device has the advantages of being simple in optical structure, compact in size, low in power consumption, low in cost and the like, and the possibility of achieving a portable spectral polarization imager is provided. The automatic device can be used for combining polarizing elements such as filters, phase retarders and polaroids at multiple angles, and important application value is achieved for studying the problems of polarization changes, multi-band and full-polarization parameter measuring and the like in an optical system.

Description

technical field [0001] The invention belongs to the field of polarization imaging detection, in particular to a compact automatic device for multi-band full polarization imaging. Background technique [0002] Polarization imaging technology is mainly used to obtain the Stokes vector image of the target. According to the method of obtaining polarization images, polarization imaging is mainly divided into time-series polarization imaging, interference polarization imaging and spatial domain polarization imaging. Sequential polarization imaging is to obtain polarization images at different angles by rotating the polarization element or change the polarization characteristics of the polarization element by modulating the device. The advantages are simple optical structure and low cost. The disadvantage is that it cannot handle moving targets. Interferometric polarization imaging generally has the problem of crosstalk between different wavelengths in polychromatic light or broadb...

AI Technical Summary

Problems solved by technology

Sequential polarization imaging is to obtain polarization images at different angles by rotating the polarization element or change the polarization characteristics of the polarization element by modulating the device. The advantages are simple optical structure and low cost. The disadvantage is that it cannot handle moving targets.

Interferometric polarization imaging generally has the problem of crosstalk between different wavelengths in polychromatic light or wide-band imaging. It is mainly used in single-wavelength polarization imaging systems, and operations such as Fourier transform and inverse transform increase the complexity of data processing.

[0003] At present, the spatial domain polarization imaging method is mainly used to obtain polarization images, which solves the problem of multiple measurements in the time series polarization imaging method, but the inconsistency of the performance of each polarization detection unit (optical system, detector, etc.) is the main reason for this method in polarization detection. The error factors that cannot be eliminated cause the detection accuracy to be low, and the optical system is complex, large in size and expensive in cost

The earliest one in China is the "Polarization Imaging Device" with three CCD imaging designed by Anhui Optical Machinery in 2002. The publication number is CN2569177Y. The detection device has a complex structure and a large volume, and can only measure three polarization parameters

In 2013, Shen Weimin of Soochow University and others disclosed "A Split-Aperture Optical Lens for Polarization Imager", the publication number is CN103197403A, which adopts off-center and off-axis optical design, four-channel single CCD full polarization imaging, and the directions of the four polarizers are 0°, 45°, 90°, and 135° are fixedly placed, but the information of each channel signal arriving at the CCD is easy to interact with each other, resulting in a decrease in measurement accuracy

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