Proceedings of the
9th International Conference of Nanomanufacturing (nanoMan2024)
December 1 – 4, 2024, Singapore

Optical Angle Sensor Based on Laser Autocollimation with a Photodiode Array and a Multi-Longitudinal-Mode Laser

Keita Nakaoka1 and Yuki Shimizu2

1Department of Human-Machine System Design, Hokkaido University, Japan
2Division of Mechanical and Aerospace Engineering, Hokkaido University, Japan.

ABSTRACT

An optical angle sensor based on laser autocollimation using a photodiode (PD) as a photodetector can detect angular displacement with high resolution. By narrowing the focused laser beam diameter on the PD, the angle detection resolution can be improved but the measurement range is sacrificed. To expand the measurement range while maintaining high resolution, a new optical angle sensor based on laser autocollimation employing a multimode longitudinal laser as the light source and a photodiode array as the photodetector is attempted in this paper. To evaluate the basic characteristics of the proposed method through experiments, a prototype optical system is constructed.

Keywords: Optical angle sensor, Laser autocollimation, Multi-element photodiode.


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