30 December 2004 Preparation of multimode fiber grating by microprocessing modification and their temperature-sensing properties
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Abstract
The excimer laser was used to perform precise machining of optic fiber to form FBG for fiber optic sensing. The influence of various H2-loading conditions to the photosensitivity of fiber and performance of FBG have been studied, and the temperature sensing properties of the FBG have been investigated. The results show that the photosensitivity of the fiber is determined by hydrogen concentration and the refractive index changes of fiber increases dramatically with the increase of treatment times and finally become saturated. Therefore, the grating reflectivity of the fiber can be controlled by adjusting hydrogen-loading pressure and H2-loading times. The results also show that when the FBG was used for temperature sensing, the Bragg wavelength of the grating is linearly dependent on the environment temperature and the repeatability is good, which indicate that this kind of FBG are appropriate elements to fabricate fiber optic temperature sensors and their systems.
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Sijin Xin, Desheng Jiang, Jianzhi Li, Jun Huang, "Preparation of multimode fiber grating by microprocessing modification and their temperature-sensing properties", Proc. SPIE 5641, MEMS/MOEMS Technologies and Applications II, (30 December 2004); doi: 10.1117/12.579845; https://doi.org/10.1117/12.579845
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