9 May 2018 Doppler velocity measurement with self-mixing effect of direct modulated laser diode enabling velocity direction
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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.
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Amalina Athira Ibrahim, Amalina Athira Ibrahim, Sumiaty Ambran, Sumiaty Ambran, Fauzan Ahmad, Fauzan Ahmad, Osamu Mikami, Osamu Mikami, Chiemi Fujikawa, 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); doi: 10.1117/12.2306204; https://doi.org/10.1117/12.2306204
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