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Laser self-mixing interferometry is a new method proposed for measuring velocity of a moving target. When the optical beam is back-scattered into the active cavity, laser output power and frequency are modulated. By signal processing, the Doppler frequency can be acquired, and the target's velocity can be calculated. Based on these properties, a low-cost interferometry velocity sensor can be designed...
A fiber optic strain sensor has been devised based on the use of optical feedback or self-mixing interference within the cavity of a single-longitudinal-mode laser as a novel fiber Bragg grating interrogation scheme for strain measurement in the domain of structural health monitoring. The entire sensor device thus simply consists of a laser diode with an integrated photodiode coupled to a fiber Bragg...
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