Research on the multi-longitudinal mode laser self-mixing static angle-measurement system using a right-angle prism

• Published in: Measurement : journal of the International Measurement Confederation Vol. 162; p. 107906
• Main Authors: Zhao, Yunkun, Xiang, Rong, Huang, Zuotang, Chen, Jisun, Zhai, Longhua, Wang, Xiang, Ma, Yangcheng, Yu, Benli, Lu, Liang
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.10.2020; Elsevier Science Ltd
• Subjects: Absolute angle; Angular resolution; Correlation analysis; Deflection; Error analysis; Lasers; Measurement; Measuring instruments; Multi-longitudinal mode laser; Right-angle prism; Self-mixing; Semiconductor lasers; Sensor; Sensors; Waveform analysis; Waveforms; Self-mixing; Right-angle prism; Absolute angle; Sensor; Multi-longitudinal mode laser
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2020.107906

[Display omitted] •A self-mixing absolute angle sensor is developed to measure the deflection angle.•The method has been realized the static absolute angle-measurement of the system.•The angle-measurement range is as many as ± 6.00° and angular resolution is 0.20°.•This angle-measurement sensor has good stability, practicability and reliability. A static absolute angle measurement method using a right-angle prism as the angle-sensing device is developed for measuring the deflection angle by means of the multi-longitudinal mode laser self-mixing sensor. In the experiment, a laser diode operating at multiple excitation longitudinal modes is exploited as the optical source for deflection angle measurement. The measured self-mixing waveforms are in accordance with the simulated waveforms, of which demonstrate that the multi-longitudinal mode laser self-mixing sensor is available for measuring the deflection angle. Meanwhile, the angle-measurement range of the self-mixing sensing system is as many as ±6.00° corresponding to 0.20° angular resolution. Furthermore, both of the absolute angle measurement error and the linear correlation of the measured angle and the actual angle are further analyzed and investigated.