Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1998-04-02
2000-08-01
Kim, Robert H.
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, 356352, G01B 902
Patent
active
060974788
ABSTRACT:
A fiber optic acoustic emission (FOAE) sensor particularly suitable for vibration sensing in a hostile environment has a pair of optical fibers each having an end face. In one embodiment, a hollow tube or core having opposite open ends receives the end faces of the optical fibers. Means are provided for fixing the optical fibers in the hollow core with the end faces facing each other and spaced by a distance from each other in the core. A signal processing unit is connected to the optical fibers for supplying light to, and for receiving light from, the optical fibers and for measuring variations in optical phase which result in changes in the light intensity due to vibrations of the hollow core. The hollow core is fixed in a resonant cylinder, and the resonant cylinder is fixed in a housing to complete the sensor. Other embodiments dispense with the need for the hollow tube or core and employ means for fixing the optical fibers within a precision hole, advantageously produced by electrical discharge machining (EDM) or similar processes, provided in the resonant cylinder. A system employing these embodiments of the FOAE sensor is also disclosed.
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Murphy, Kent A. et al. "Acoustic Wave Response of the Extrinsic Fabry-Perot Interferometric (EFPI) Optical Fiber Sensor", Adaptive Structures and Material Systems-American Society of Mechanical Engineers, Aerospace Div., AD vol. 35, published by ASME, New York, NY 1993, pp. 395-399.
Berthold John W.
Roman Garry W.
Baraona Robert C.
Edwards Robert J.
Kim Robert H.
Lee Andrew H.
Marich Eric
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