17 May 2016 Microwave photonic distributed sensing in harsh environment
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We report a new distributed fiber optic sensing technique using optical carrier based microwave interferometry. The concept has been demonstrated using different types of optical fibers including singlemode fiber, multimode fiber, single crystal sapphire fiber and polymer fiber. Using the microwave-photonic technique, many fiber interferometers with the same or different optical path differences were interrogated and their locations could be unambiguously determined. The distributed sensing capability was demonstrated using cascaded low-finesse Fabry-Perot interferometers fabricated by fs laser micromachining. Spatially continuous, fully distributed temperature and strain measurements were used as examples to demonstrate the capability of the proposed concept.
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Baokai Cheng, Baokai Cheng, Liwei Hua, Liwei Hua, Wenge Zhu, Wenge Zhu, Yang Song, Yang Song, Lei Yuan, Lei Yuan, Yanjun Li, Yanjun Li, Hai Xiao, Hai Xiao, } "Microwave photonic distributed sensing in harsh environment", Proc. SPIE 9836, Micro- and Nanotechnology Sensors, Systems, and Applications VIII, 98360H (17 May 2016); doi: 10.1117/12.2224745; https://doi.org/10.1117/12.2224745

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