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Appl. Sci. 2016, 6(8), 208; doi:10.3390/app6080208

A Birefringent-Refraction Transducer for Measuring Angular Displacement Based on Heterodyne Interferometry

Department of Electro-Optical Engineering, Southern Taiwan University of Science and Technology, Tainan 71005, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Totaro Imasaka
Received: 7 June 2016 / Revised: 6 July 2016 / Accepted: 18 July 2016 / Published: 25 July 2016
(This article belongs to the Section Optics and Lasers)
View Full-Text   |   Download PDF [9029 KB, uploaded 25 July 2016]   |  


In this paper, an optical angle sensor with a birefringent transducer for measuring angular displacement based on a heterodyne interferometry is proposed. The achievable repeatability and linearity provide sufficient evidence for the practical use. As a result, a resolution of 5.8 × 10−6 with a dynamic range of 5° has been achieved by utilizing a KTP (potassium titanyl phosphate) plate immersed in a high refractive index oil with refractive index of 1.7. View Full-Text
Keywords: heterodyne interferometry; sensors; birefringence; angular displacement heterodyne interferometry; sensors; birefringence; angular displacement

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Twu, R.-C.; Wang, C.-S. A Birefringent-Refraction Transducer for Measuring Angular Displacement Based on Heterodyne Interferometry. Appl. Sci. 2016, 6, 208.

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