Polarimetric 360° absolute rotary encoder

IF 2.3 Q2 OPTICS

Advanced Optical Technologies Pub Date : 2022-03-07 DOI:10.1515/aot-2021-0056

Mark J. Johnson

引用次数: 1

Abstract

Abstract Encoders of angle based on rotating polarizers suffer from 180° ambiguity due to their inherent twofold rotational symmetry. This restricts their applications in motor and machine controls. We show that the ambiguity can be resolved through a geometrical mapping from a plane to a conical surface. Seen from the local surface normal, one full rotation of the cone gives one half rotation of the polarizer axis. With appropriate transmission or reflective optics and multiphase detection, we build high resolution, moderate accuracy, absolute-angle encoders without 180° ambiguity. Polymer birefringent retarders can be used similarly.

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偏振360°绝对旋转编码器

摘要基于旋转偏振器的角度编码器由于其固有的双重旋转对称性而存在180°模糊性。这限制了它们在电机和机器控制中的应用。我们证明了模糊性可以通过从平面到圆锥表面的几何映射来解决。从局部表面法线看，圆锥体的一个完整旋转给出偏振器轴的一半旋转。通过适当的透射或反射光学和多相检测，我们构建了高分辨率、中等精度、无180°模糊度的绝对角度编码器。聚合物双折射延迟剂可以类似地使用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Optical Technologies OPTICS-

CiteScore

4.40

自引率

0.00%

发文量

期刊介绍： Advanced Optical Technologies is a strictly peer-reviewed scientific journal. The major aim of Advanced Optical Technologies is to publish recent progress in the fields of optical design, optical engineering, and optical manufacturing. Advanced Optical Technologies has a main focus on applied research and addresses scientists as well as experts in industrial research and development. Advanced Optical Technologies partners with the European Optical Society (EOS). All its 4.500+ members have free online access to the journal through their EOS member account. Topics: Optical design, Lithography, Opto-mechanical engineering, Illumination and lighting technology, Precision fabrication, Image sensor devices, Optical materials (polymer based, inorganic, crystalline/amorphous), Optical instruments in life science (biology, medicine, laboratories), Optical metrology, Optics in aerospace/defense, Simulation, interdisciplinary, Optics for astronomy, Standards, Consumer optics, Optical coatings.