Simultaneous measurement of strain and temperature with a long-period fiber grating inscribed Sagnac interferometer |
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| Authors: | Juan Kang Xinyong Dong Wenwen Qian |
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| Institution: | a Institute of Optoelectronic Technology, China Jiliang University, Hangzhou Zhejiang 310018, Chinab School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | A Sagnac interferometer with a long-period fiber grating (LPG) inscribed in the polarization-maintaining fiber (PMF) is proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. Due to the different responses of the LPG and the Sagnac interferometer to strain and temperature, simultaneous measurement can be achieved by monitoring the wavelength shifts and the intensity changes of a resonance dip of the sensor setup. The experimental results show that the achieved sensitivities to strain and temperature are 6.4 × 10− 3 dB/με and 0.65 nm/°C, respectively. |
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| Keywords: | Sagnac interferometer Strain and temperature measurements Polarization maintains fiber Long-period fiber grating |
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