Doppler velocity measurement with self-mixing effect of direct modulated laser diode enabling velocity direction

Amalina Athira Ibrahim; Sumiaty Ambran; Fauzan Ahmad; Osamu Mikami; Chiemi Fujikawa

doi:10.1117/12.2306204

9 May 2018 Doppler velocity measurement with self-mixing effect of direct modulated laser diode enabling velocity direction

Amalina Athira Ibrahim, Sumiaty Ambran, Fauzan Ahmad, Osamu Mikami, Chiemi Fujikawa

Author Affiliations +

Proceedings Volume 10680, Optical Sensing and Detection V; 1068028 (2018) https://doi.org/10.1117/12.2306204
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

Doppler Laser Velocity measurement by self-mixing effect using direct modulation laser diode is proposed to distinguish the direction of the object movement. To distinguish the movement direction in conventional way, it is needed to assemble a frequency shift device such as an acoustic optic cell in the optical system. However, the self-mixing scheme cannot satisfy this condition this due to its simple system. Therefore, we applied triangularwave modulation current with repetition frequency of 250Hz directly to the laser diode emitting at a wavelength of 780nm. Target speed of 0.1 - 0.4 cm/s is measured and its movement direction forward and/or backward can be distinguished successfully. Both the velocity and moving direction of the target are obtained.

Citation Download Citation

Amalina Athira Ibrahim, Sumiaty Ambran, Fauzan Ahmad, Osamu Mikami, and Chiemi Fujikawa "Doppler velocity measurement with self-mixing effect of direct modulated laser diode enabling velocity direction", Proc. SPIE 10680, Optical Sensing and Detection V, 1068028 (9 May 2018); https://doi.org/10.1117/12.2306204

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