Zhang, M.; Yang, H.; Niu, Q.; Zhang, X.; Yang, J.; Lai, J.; Fan, C.; Li, M.; Xin, C. Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings. Sensors2024, 24, 908.
Zhang, M.; Yang, H.; Niu, Q.; Zhang, X.; Yang, J.; Lai, J.; Fan, C.; Li, M.; Xin, C. Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings. Sensors 2024, 24, 908.
Zhang, M.; Yang, H.; Niu, Q.; Zhang, X.; Yang, J.; Lai, J.; Fan, C.; Li, M.; Xin, C. Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings. Sensors2024, 24, 908.
Zhang, M.; Yang, H.; Niu, Q.; Zhang, X.; Yang, J.; Lai, J.; Fan, C.; Li, M.; Xin, C. Combined Displacement and Angle Sensor with Ultra-High Compactness Based on Self-Imaging Effect of Optical Microgratings. Sensors 2024, 24, 908.
Abstract
In this paper, an ultracompact combined sensor for displacement and angle synchronous measurement is proposed based on self-imaging effect of optical microgratings. Using a two-grating structure, linear and angular displacement can be measured by detecting the change of phase and amplitude of the optical transmission respectively within one single structure in meantime. The optical transmitted properties of the two-grating structure are investigated in both theory and simulation. Simulated results indicate that, the optical transmission changes in a sinusoidal relationship to the input linear displacement. Meanwhile, the amplitude of the curve decreases with an input pitch angle, indicating the ability for synchronous measurement within one single compact structure. The synchronous measurement of the linear displacement and the angle is also demonstrated experimentally. The results show a resolution down to 4nm for linear displacement measurement, and a sensitivity of 0.26mV/arcsec within a range of ±1° for angle measurement. Benefitting from a simple common-path structure without using optical components including reflectors and polarizers, the sensor shows an ultrahigh compactness for multiple-degrees-of-freedom measuring, indicating the great potential for this sensor in the fields such as integrated mechanical positioning and semiconductor fabrication.
Keywords
self-imaging effect; optical micrograting; combined sensor; multi degree of freedom; displacement
Subject
Engineering, Mechanical Engineering
Copyright:
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.
