Fiber Bragg grating strain sensor based on fiber laser |
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Authors: | Xiufeng Yang Shaojun Luo Jun Hong Ng |
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Affiliation: | a Embedded System Department, Institute for Infocomm Research, 21 Heng Mui Keng Terrace, Singapore 119613 b Institute of Physics, Nankai University, Tianjin 300071, China c Department of Electronic and Information Engineering, Hong Kong Polytechnic University, China |
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Abstract: | A study on fiber Bragg grating (FBG) strain sensor, based on erbium-doped fiber (EDF) laser, is presented. A strain-sensing element, FBG, also acts as the lasing wavelength selecting component. When strain is applied on the FBG, the laser cavity loss changes, leading to a modification of the laser transient. Strain measurements are obtained in the time domain by simply measuring the EDF laser build-up time. Relative variation in the build-up time of up to 190%, for a strain range from 0 με to 2350 με, is achieved with a resolution corresponding to a strain of better than 2.35 με. This study demonstrates a novel fiber sensor concept and the technical feasibility to develop fiber strain measurement. |
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Keywords: | Fiber strain sensor Fiber Bragg gratings (FBGs) Fiber lasers |
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