Temperature and strain discrimination using two parallel connected Sagnac loops based on character-1 shaped polarization-maintaining fiber |
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| Authors: | Jie Shi Shilin Xiao Lilin Yi He Chen |
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| Institution: | 1. Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China;2. National Engineering Laboratory for Fiber Optic Sensing Technology, Wuhan University of Technology, Wuhan 430074, China;3. Photonics Research Center, Guilin University of Electronics Technology, Guilin 541004, China;1. College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China;2. State Key Laboratory of Synthetical Automation for Process Industries, Shenyang, 110819, China |
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| Abstract: | A fiber sensor configuration suitable for discrimination of temperature and strain is presented. The sensor head is composed of two parallel concatenated Sagnac loops based on character-1 shaped polarization-maintaining fiber (PMF). The two Sagnac loops include different sections of character-1 shaped PMFs, and show different sensitivity to temperature and strain. By monitoring the wavelength shift of the two dips in the transmission spectrum, simultaneous measurement of temperature and strain is obtained. The sensitivity for strain and temperature are measured to be 14.46 pm and ? 0.54 nm. |
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