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Optical fibers are being used in an increasingly wider range of applications, some of which involve elevated temperature and pressure in the presence of water. Measurements of the penetration rate of water into optical fibers at elevated temperature (300 degree(s)C) and pressure (1440 psi) is presented for standard communication grade silica fiber and for protected fibers. The penetration rate was monitored in- situ using a broadband light source and an optical spectrum analyzer to measure the change in absorption over the spectral range from 400 to 1700 nm. Methods to protect the optical fibers from water penetration were also evaluated in the elevated temperature and pressure environment. Stress corrosion cracking data for fibers exposed to air at room temperature and pressure as well as dry and wet fiber treatments is also presented in terms of time to failure versus bend radius for selected environmental conditions. Effect of chemical treatments on the time to failure at fixed bend radius both for pre-water and post-water exposure is presented.
Gary R. Pickrell,Yuhong Duan,Bing Qi,Russell G. May, andAnbo Wang
"Diffusion of water in optical fibers at elevated temperature and pressure", Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); https://doi.org/10.1117/12.456081
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Gary R. Pickrell, Yuhong Duan, Bing Qi, Russell G. May, Anbo Wang, "Diffusion of water in optical fibers at elevated temperature and pressure," Proc. SPIE 4578, Fiber Optic Sensor Technology and Applications 2001, (14 February 2002); https://doi.org/10.1117/12.456081