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Temperature insensitive fiber optical displacement sensors based on double fiber Bragg gratings
Author(s) -
Jiang Ming,
Cui Liuzhu,
Liu Rong
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28052
Subject(s) - fiber bragg grating , materials science , optics , displacement (psychology) , fiber optic sensor , phosfos , fiber , wavelength , cantilever , optical fiber , dispersion shifted fiber , optoelectronics , physics , composite material , psychology , psychotherapist
A temperature insensitive fiber optical displacement sensor based on double Bragg gratings is presented and experimentally demonstrated. The sensor is constructed by a trapezoid slid block and two isosceles cantilevered beams, and two fiber Bragg gratings (FBG) that are glued on the two beams. The displacement can be measured by interrogating the wavelength difference of the two FBGs, and the temperature dependence is greatly reduced. Experimental results show that a displacement sensitivity of 120 pm/mm and a temperature dependence of 2.1 pm/°C are achieved. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:304–306, 2014