Applied Sciences, Vol. 6, Pages 208: A Birefringent-Refraction Transducer for Measuring Angular Displacement Based on Heterodyne Interferometry

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.

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