10 April 2007 Multiplexing low-coherence interferometer sensors: laboratory tests and design for integration within RC structures
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Abstract
One of the advantages of fiber optics with respect to traditional electrical gauges is they can act both as sensors and as a pathway for signals produced by other sensors. This feature allows adoption of a simple sensor system architecture, even when arrays of many sensors are needed. In this paper, we present the development and laboratory validation of in-line multiplexing for the low-coherence interferometric SOFO standard deformation sensor. A standard SOFO, as developed, produced and commercialized by Smartec SA, employs total reflectors at the end of the measurement and the reference fibers, allowing measurement of the strain over a single field. In the solution presented, broadband Fiber Bragg Gratings (FBGs) are employed as partial reflectors to obtain in-line multiplexing. These FBGs, presenting a 5% reflectivity in their reflection spectra, are produced using a chirped phase mask. An experiment was carried out on a 3-field sensor, to investigate effectiveness, resolution and temperature sensitivity. Outcomes show clear fringe visibility for each pair of gratings and a resolution of about 2.5 &mgr;m RMS, of the same order as the single field sensor. Issues regarding the maximum number of measurement fields on a single line and deformation range limits are discussed.
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Matteo Pozzi, Daniele Zonta, Huayong Wu, Daniele Inaudi, "Multiplexing low-coherence interferometer sensors: laboratory tests and design for integration within RC structures", Proc. SPIE 6529, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2007, 65293I (10 April 2007); doi: 10.1117/12.718750; https://doi.org/10.1117/12.718750
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