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Abstract
A length-matched micro Fabry-Perot (FP) interferometer is proposed for strain measurement under irradiation environment. Theoretical simulation shows that a well length-matched FP sensor can achieve a very low drift of the cavity length and strain sensitivity in irradiation environment. In experiment, such an FP cavity is realized by laser micromachining. It shows a low cavity length drift of −0.037 µm and a strain sensitivity deviation of 0.52%, respectively, under gamma irradiation. Meanwhile, the intensity of interference fringes is also stable. As a result, such a length-matched FP cavity is a very promising candidate for strain sensing in radiative environments.
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Details
1 Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, China (GRID:grid.419897.a) (ISNI:0000 0004 0369 313X)
2 Key Laboratory of Optical Fiber Sensing & Communications (Ministry of Education), University of Electronic Science and Technology of China, Chengdu, China (GRID:grid.419897.a) (ISNI:0000 0004 0369 313X); Nuclear Power Institute of China, Science and Technology on Reactor System Design Technology Laboratory, Chengdu, China (GRID:grid.464276.5) (ISNI:0000 0001 0381 3718)
3 Nuclear Power Institute of China, Science and Technology on Reactor System Design Technology Laboratory, Chengdu, China (GRID:grid.464276.5) (ISNI:0000 0001 0381 3718)
4 University of Electronic Science and Technology of China, School of Information and Communication Engineering, Chengdu, China (GRID:grid.54549.39) (ISNI:0000 0004 0369 4060)