Simultaneous measurement of curvature and temperature based on PCF-based interferometer and fiber Bragg grating |
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| Authors: | Yan Zhou Wenjun Zhou Chi Chiu Chan Li-Yang Shao Xinyong Dong |
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| Institution: | a Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, Chinab Zhejiang Province Institute of Metrology, Hangzhou 310013, Chinac Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637457, Singapore |
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| Abstract: | A sensor head consisting of a photonic crystal fiber (PCF)-based Mach-Zehnder interferometer (MZI) and a fiber Bragg grating (FBG) is proposed and experimentally demonstrated for simultaneous measurement of curvature and temperature. The MZI fabricated by splicing a short length of PCF between two single-mode fibers with the air-hole structure that completely collapsed near the splicing points, is sensitive to fiber bending and surrounding temperature, while the FBG is only sensitive to the later. Simultaneous measurement of curvature and temperature is therefore obtained. Sensitivities of 4.06 nm/m− 1 and 6.30 pm/°C are achieved experimentally for curvature and temperature, respectively. And the corresponding resolutions are 5.2 × 10− 4 m− 1 and 1.25 °C for curvature and temperature, respectively, based on the wavelength measurement resolution of 10 pm. |
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| Keywords: | Photonic crystal fibers Mach-Zehnder interferometers Fiber Bragg gratings Optical fiber sensors |
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