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30 May 1996 Comparison of optical fiber long-period and Bragg grating sensors
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The U.S. Navy is developing advanced fiber optic sensors for machinery monitoring and diagnosis. Robust, inexpensive fiber sensors which can be embedded into metal structures are desired in order to make strain and temperature measurements close to the expected machinery fault. The use of several types of fiber sensors was considered for embedding applications. This paper compares the properties and performance of optical fiber-based long-period and Bragg grating temperature, strain and refractive index sensors. The comparison is based on magnitude of spectral shift of the resonance bands, cross-sensitivity to undesired perturbations, bend sensitivity, and the ease and cost of demodulating the grating signal. The sensitivities of the long-period grating sensors were found to be strong functions of the fiber parameters. Although the long-period grating sensors displayed undesired cross-sensitivities and dependence on fiber bends, they exhibited larger spectral shifts than the short-period fiber Bragg grating sensors and can be employed with relatively inexpensive sensor demodulation methods. These features and the fact that the long-period grating sensors are more economical to manufacture make them a strong candidate for naval machinery monitoring applications.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vikram Bhatia, Tiffanie D'Alberto, Kent A. Murphy, Richard O. Claus, and Christopher Peter Nemarich "Comparison of optical fiber long-period and Bragg grating sensors", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996);

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