SIMULTANEOUS MEASUREMENT OF STRAIN AND TEMPERATURE WITH POLARIZATION MAINTAINING FIBER BRAGG GRATING LOOP MIRROR |
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| Authors: | Qi Wang Ji Xia Yong Zhao Xu Liu Peng Wang Ya-nan Zhang |
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| Affiliation: | 1. College of Information Science and Engineering , Northeastern University , Shenyang , China;2. State Key Laboratory of Synthetical Automation for Process Industries , Northeastern University , Shenyang , China;3. College of Information Science and Engineering , Northeastern University , Shenyang , China |
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| Abstract: | □ A novel simultaneous method of strain and temperature measurement based on a polarization maintaining fiber Bragg grating loop mirror is proposed and demonstrated. The sensing head was composed of a fiber loop mirror and a section of fiber Bragg grating made of a polarization maintaining fiber. The Bragg wavelengths of the fiber grating in the polarization maintaining fiber were along slow and fast axis showing different sensitivities to strain and temperature with the interferometric peak wavelength of the fiber loop mirror. By monitoring the shifts of the Bragg wavelength and interferometric peak of the fiber loop mirror, with its temperature sensitivity of 0.1167 nm/°C and strain sensitivity of 0.0093 nm/μ?, a temperature measurement resolution about 0.009°C and a strain measurement resolution of 1.08 μ? was achieved theoretically and experimentally. |
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| Keywords: | fiber loop mirror fiber optic sensor polarization maintaining fiber bragg grating stain temperature |
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