Abstract
We describe a fiber optic velocity sensor which performs non contact measurements of structural vibrations. The sensor responds directly to the velocity of the sample structure rather than the associated displacement or acceleration through measurement of the Doppler- induced frequency shift of light reflected from the vibrating structure. Light from a single- frequency laser is launched into a fiber optic system which serves the dual role of delivering light to the structure and recollecting the frequency shifted reflected light. The frequency shift, which is proportional to the sample velocity, is processed with a fiber optic Mach-Zehnder interferometer with a relative optical path imbalance. The maximum detectable velocity of the sensor is greater than 1 km/s and is scalable over several orders of magnitude with changes in the fiber optic interferometer. Resolution of the velocity sensor is 80 micrometer/second/(root)Hz.
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