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Doppler velocity measurement with self-mixing effect of direct modulated laser diode enabling velocity direction
Author(s): Amalina Athira Ibrahim; Sumiaty Ambran; Fauzan Ahmad; Osamu Mikami; Chiemi Fujikawa
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Paper 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.

Paper Details

Date Published: 9 May 2018
PDF: 7 pages
Proc. SPIE 10680, Optical Sensing and Detection V, 1068028 (9 May 2018); doi: 10.1117/12.2306204
Show Author Affiliations
Amalina Athira Ibrahim, Univ. Teknologi Malaysia (Malaysia)
Sumiaty Ambran, Univ. Teknologi Malaysia (Malaysia)
Fauzan Ahmad, Univ. Teknologi Malaysia (Malaysia)
Osamu Mikami, Univ. Teknologi Malaysia (Malaysia)
Chiemi Fujikawa, Tokai Univ. (Japan)

Published in SPIE Proceedings Vol. 10680:
Optical Sensing and Detection V
Francis Berghmans; Anna G. Mignani, Editor(s)

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