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

摘要

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.