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24 January 2019 Study on long period fiber grating sensor based on deep-grooved process
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A high-sensitivity strain sensor of LPFG based on deep-grooved process was investigated. The LPFG was fabricated by a high frequency focused CO2 laser irradiation system in ways of periodic spaced heating on the ordinary single-mode fiber. Combined with a high precision position controller and optical measurement platform, an optical fiber strain sensor measurement platform was established. A theoretical analysis based on coupled mode theory and transmission matrix method for parameter design and optimization of LPFGs was adopted. Experimental results demonstrated that the axial strain sensitivity of a LPFG strain sensor would be increased with the increase of groove depth of the grating, and such a deep-grooved LPFG strain sensor would have an axial strain sensitivity up to -10.28pm/με which should be much larger than the strain sensor without grooves on one side of fiber grating. Therefore, this novel sensor should be able to find a potential value in the field of sensor applications.
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Yang Cao, Min Zhou, Yu Liu, Yongle Lu, and Xuemei Cai "Study on long period fiber grating sensor based on deep-grooved process ", Proc. SPIE 10840, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Micro- and Nano-Optics, Catenary Optics, and Subwavelength Electromagnetics, 108401D (24 January 2019);

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