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28 October 2009 A ratio method of FCG demodulation on strain measurement
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To use FCG (Fiber Chirp Grating) as intensity demodulating sensor, the environmental interference should be eliminated, a method of signal ratio is used. Three FCGs and paired fibers are used in strain measurement, two FCGs are connected in series with the first fiber, one acts as a tensive sensor, the other acts as a compressive sensor. The third FCG is alone connected with the second fiber and acts as a reference. Sensing FCGs' intensity output is divided by reference's. Although the level of interference was put as high as the level of load, the ratio is still of good responsibility with the stress, and is of good linearity, and the maximum error in full range is 1.5%.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Weilai Li, Miao Gao, Jianjun Pan, and Shunfan He "A ratio method of FCG demodulation on strain measurement", Proc. SPIE 7514, Photonics and Optoelectronics Meetings (POEM) 2009: Fiber Optic Communication and Sensors, 751406 (28 October 2009);

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