15 October 2012 Method of measuring the rotation angle based on uniaxial crystal conoscopic interference in polarimeter
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Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 84173J (2012); doi: 10.1117/12.977849
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China
Abstract
A method of measuring the rotation angle in polarimeter is proposed .To analysis uniaxial crystal convergence polarization-interference phenomenon with Jones Matrix, the polarizer rotates an angle relatively to the analyzer , the relationship between the rotation angle of cross-shape pattern θ1 and the polarized plane rotation angle 2caused by the polarizer (or optical activity) is deduced:θ2 =2θ1.This rule can be used to measure the rotation angle in polarimeter: the polarized plane will rotate when it transmits the optical activity substance ,so the angle of cross-shape pattern will rotate. Using CCD camera to shoot the conoscopic interference pattern, measure the angle of cross-shape pattern rotated by image processing technology to obtain the angle of polarized plane rotation. Experiment is designed to demonstrate this method. Comparing the method of the stepping-motor rotating the analyzer to detect the dark position and measure the angle, this new method is real-time , digital and automation for measuring the rotatory power in polarimeter.
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Yantang Huang, Ling Ou, Jincheng Wang, "Method of measuring the rotation angle based on uniaxial crystal conoscopic interference in polarimeter", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84173J (15 October 2012); doi: 10.1117/12.977849; https://doi.org/10.1117/12.977849
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KEYWORDS
Polarizers

Crystals

Polarimetry

Optical activity

CCD cameras

Polarization

Image processing

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