Dynamic strain measurement using two wavelength-matched fiber Bragg grating sensors interrogated by a cascaded long-period fiber grating |
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| Authors: | Hongbo Zou Dakai LiangJie Zeng |
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| Institution: | a MOE Key Laboratory of Mechanics and Control for Aerospace Structures, University of Aeronautics and Astronautics, Nanjing 210016, PR China
b College of Electric Engineering and Renewable Energy, Three Gorges University, Yichang 443002, PR China |
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| Abstract: | In this work, we describe a fiber Bragg grating (FBG) sensing system using two wavelength-matched FBG sensors for static and dynamic strain measurement. A cascaded long-period fiber grating (CLPG)-based demodulation technique has been used to interrogate the two wavelength-matched FBG sensors. Experimental results of static strain measurement show that the proposed system has a strain resolution of 1 με. This system has also been used for dynamic strain measurement. An eddy current displacement meter-based system has been used as a comparison measurement. Experimental results of dynamic strain measurement have proved that the FBG sensing system has a good performance in the measurement of dynamic strain. The results of static and dynamic strain measurement indicate that the sensing system using two wavelength-matched FBG sensors is superior to the single FBG sensor system. |
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| Keywords: | Fiber Bragg grating Cascaded long-period fiber grating Sensors Dynamic strain measurement |
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