12 August 2009 The theory of fiber grating array OFDR-FS
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Abstract
A demodulation method for a quasi-distributed sensor based on an original interrogating system for concatenated low reflective Fiber Grating is proposed. The system is based on Optical Frequency Domain Reflectometer technology for which a commercial device has been extended to a wavelength-tunable device. This interrogation system has the advantage of allowing a large number of gratings to be addressed simultaneously. In our application, except of the first grating (it has 20 times higher reflective than others) all other gratings have low reflective (about 0.5% and 1 nm bandwidth at 3 dB) and have a Fiber Bragg Grating central wavelength of about 1535 nm. Compare to conventional Optical Frequency Domain Reflectometer technology, this interrogating system has very fast measurement capability and higher precision.
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FanYong Meng, Zhigang Li, Bin Yang, Susan Dong, Zhuanyun Guo, "The theory of fiber grating array OFDR-FS", Proc. SPIE 7458, Remote Sensing System Engineering II, 74580L (12 August 2009); doi: 10.1117/12.824477; https://doi.org/10.1117/12.824477
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