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Key Problem Research of Imaging Polarimeter

Author: ZhangPeng
Tutor: YangJianYi；LiYuBo
School: Zhejiang University
Course: Microelectronics and Solid State Electronics
Keywords: Polarization measurement Stokes Vectors Mueller Matrix Liquid Crystal Variable Retarder
CLC: O439
Type: Master's thesis
Year: 2012
Downloads: 48
Quote: 0
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Abstract


As one of the basic properties of light, polarization contains many features of the objects to be measured. The detection of polarized light has important value in the field of optical measurement. It has been applied in many areas, which include target recognition, biomedical engineering, remote-sensing, astronomy, machine vision and military application. The human eyes cannot perceive the polarization information of light, so how to build fast, high-precision polarization measurement devices is one of the hot topics at home and abroad.This thesis mainly studied the key problems in the imaging polarimeter, which are related to the establishment of the system, the analysis of measuring results and application of the polarimeter. In theory, according to the measurement structure of the liquid crystal modulator and double-CCD, this thesis presents a four-modulation mode of the liquid crystal to measure the full-Stokes vectors. This method required the calculation of low complexity, which is easy to be programmed and calculated. In the establishment of the measurement system, this thesis developed a pixel-level matched double-CCD module. Based on this module, a full-Stokes vectors measurement system which has a DSP processor as its control core was established, as well as a Mueller matrix imaging measurement system which is used for microscopy. In the analysis of the results on the polarization measurement, the polarization parameter images calculated from Stokes vectors were mainly talked about. Degree of polarization, azimuth of polarization, ellipticity and other polarization parameters were studied for their significances in the identification and measurement of the objects to be measured. According to the calibration results and the analysis of sources of error of the measurement system, the result was corrected to achieve high measurement accuracy. The contents of this thesis provide a reliable technical solution for the practical use of polarization measurement methods.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Applied Optics
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