Laser Doppler velocimeter using phase shift method for discrimination of the motion direction

Jiaqi Suo; Jian Zhou; Bin Zhang

doi:10.1117/12.2691566

24 November 2023 Laser Doppler velocimeter using phase shift method for discrimination of the motion direction

Jiaqi Suo, Jian Zhou, Bin Zhang

Author Affiliations +

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293503 (2023) https://doi.org/10.1117/12.2691566
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

In order to discriminate the sense of velocity, this paper proposes a laser Doppler velocimetry system based on the phase shift method. First, the expression for the light intensity of the interference field is derived, and the relationship between the interference fringes in time is obtained. Then two signal reception channels are generated by means of optical methods with a phase difference of π/2 between them. Finally, the direction of velocity is identified according to the change in phase between the two signals caused by the change in the direction of movement of the object. The experimental results show that the direction of velocity can be effectively determined by using the phase discrimination method.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Jiaqi Suo, Jian Zhou, and Bin Zhang "Laser Doppler velocimeter using phase shift method for discrimination of the motion direction", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293503 (24 November 2023); https://doi.org/10.1117/12.2691566

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KEYWORDS

Signal detection

Doppler effect

Laser Doppler velocimetry

Laser frequency

Beam path

Phase shifts

Beam splitters

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