(Received 12 June 1995; accepted 22 April 1996)
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An experimental study is conducted to evaluate the applicability of optical fiber sensors in measuring strains under dynamic loading conditions. Both phase modulated and intensity modulated sensors are studied. The experiments are performed to characterize the high strain rate response of these sensors and test their ability to measure changes in dynamic strain resulting from one-dimensional stress wave propagation. The stress waves are generated using both compressive and tensile gas gun setups. Then, optical fiber sensors are employed to monitor the stress wave pulse as it propagates down the bar. The output from the optical fiber sensors is compared to strain gages mounted at the same location. The results demonstrate that only localized optical fiber sensors that are bonded over the entire sensing region can be used for monitoring dynamic strain fields.
Postdoctoral scholar, Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA
Professor, University of Rhode Island, Kingston, RI
Stock #: JTE11307J