Multi-component and residual strain field characterization using a quadrature phase shifted EFPI
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States)
- Fiber and Sensor Technologies, Inc., Christiansburg, VA (United States)
Fabry-Perot interferometers have been used in fiber optic sensor applications to measure various relative strain and environmental effects in materials and structures. Industrial, commercial, and military applications have all been demonstrated. In this paper the authors present the ability to make absolute measurements using an absolute extrinsic Fabry-Perot interferometer (AEFPI). Performance is demonstrated with a measurement rate of 2 {micro}m/sec. A modified EFPI sensor that is able to distinguish between axial strain and the other strain states is also presented. The quadrature phase shifted extrinsic Fabry-Perot interferometer (QPS/EFPI) takes advantage of two input fibers whose transfer function curves are displaced by one quarter of a complete fringe, thus allowing determination of strain magnitude and direction. A variety of applications are described demonstrating the diverse scope and effectiveness of the EFPI sensors. These applications could benefit from the additional measurement capabilities of the aforementioned sensor designs.
- OSTI ID:
- 395198
- Report Number(s):
- CONF-940691-; ISBN 1-56676-171-9; TRN: IM9648%%321
- Resource Relation:
- Conference: 2. international conference on intelligent materials, Williamsburg, VA (United States), 5-8 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of Second international conference on intelligent materials: Proceedings; Rogers, C.A.; Wallace, G.G. [eds.]; PB: 1410 p.
- Country of Publication:
- United States
- Language:
- English
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