期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 243, 期 -, 页码 800-805出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.12.016
关键词
Sagnac interference; Balloon-like interferometer; Composite interference; Refractive index (RI) sensing; Temperature sensing
资金
- National Science Foundation for Distinguished Young Scholars of China [61425003]
- National Natural Science Foundation of China [61273059]
- Fundamental Research Funds for the Central Universities [N130104002, N130604006]
- State Key Laboratory of Synthetical Automation for Process Industries [2013ZCX09]
A novel composite interference structure constructed with the combination of Sagnac loop mirror and balloon-like interferometer for simultaneous measurement of refractive index (RI) and temperature is proposed and experimentally demonstrated. A polarization maintaining fiber (PMF) is embedded into the Sagnac loop structure to form a Sagnac loop interferometer, which is highly sensitive to external temperature variations. The balloon-like structure is built with a bend single mode fiber (SMF) to form a modal interferometer, which is sensitive to both external RI and temperature variations. As the two sensing structures are based different interference principles, the two interference spectra do not interfere with each other. By optimizing the bending diameter of the balloon-like interferometer and the length of PMF in the Sagnac loop mirror, separate different resonance wavelengths can be well formed. Hence, the simultaneous measurement of RI and temperature can be realized by monitoring the shift of different resonance wavelengths. Experimental results show that the optimal sensitivities of the RI and temperature can reach up to 218.56 nm/RIU and 1.7 nm/degrees C, respectively. (C) 2016 Elsevier B.V. All rights reserved.
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