Abstract
A two-channel fiber optic displacement probe is examined to determine its performance characteristics as a vibration sensor for use in performing structural power flow measurements. Its amplitude sensitivity and phase' response are determined and compared with those of more traditional sensors, including accelerometers, eddy current probes and capacitance gauges. Structural power flow measurements are made using a vibrating beam set-up to compare the performance of the fiber optic probe with that of a linear array of accelerometers. The results of the test indicate that the optical probes possess operating parameters at least as good as those of the other sensors tested, and are accurate to within 8.5% in measuring the structural power flow.
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