This paper reports a distributed fiber optic sensing technique through microwave assisted separation and reconstruction of optical interferograms in spectrum domain. The approach involves sending a microwave-modulated optical signal through cascaded fiber optic interferometers. The microwave signal was used to resolve the position and reflectivity of each sensor along the optical fiber. By sweeping the optical wavelength and detecting the modulation signal, the optical spectrum of each sensor can be reconstructed. Three cascaded fiber optic extrinsic Fabry-Perot interferometric sensors were used to prove the concept. Their microwave-reconstructed interferogram matched well with those recorded individually using an optical spectrum analyzer. The application in distributed strain measurement has also been demonstrated.
J. Huang et al., "Microwave Assisted Reconstruction of Optical Interferograms for Distributed Fiber Optic Sensing," Optics Express, vol. 21, no. 15, pp. 18152-18159, Optical Society of America, Jul 2013.
The definitive version is available at http://dx.doi.org/10.1364/OE.21.018152
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Distributed strain measurement; Extrinsic Fabry-Perot interferometric sensor; Fiber-optic interferometers; Fiber-optic sensing; Modulation signals; Optical interferograms; Optical spectrum analyzer; Optical wavelength; Fiber optics; Interferometry; Microwaves; Optical fibers; Spectrum analyzers; Microwave sensors; article; Computer aided design; Equipment; Equipment design; Equipment failure; Fiber optics; Interferometry; Microwave radiation; Refractometry; Transducer; Device failure analysis; Devices; Fiber optics; Interferometry; Refractometry; Computer-Aided Design; Equipment Design; Equipment Failure Analysis; Fiber Optic Technology; Interferometry; Microwaves; Refractometry; Transducers; Equipment Design; Equipment Failure Analysis; Fiber Optic Technology; Interferometry; Microwaves; Refractometry; Transducers
International Standard Serial Number (ISSN)
Article - Journal
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