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Sensors 2014, 14(8), 14210-14221; doi:10.3390/s140814210

A Thermally Annealed Mach-Zehnder Interferometer for High Temperature Measurement

Physics Department, Northwest University, No.229, Taibai Road (North), Xi'an 710069, China
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Received: 23 May 2014 / Revised: 21 July 2014 / Accepted: 25 July 2014 / Published: 4 August 2014
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Abstract

An in-fiber Mach-Zehnder interferometer (MZI) for high temperature measurement is proposed and experimentally demonstrated. The device is constructed of a piece of thin-core fiber (TCF) sandwiched between two short sections of multimode fiber (MMF), i.e., a MMF-TCF-MMF structure. A well-defined interference spectrum is obtained owing to the core-mismatch, and the interference dips are sensitive to the ambient temperature. The experimental results show that the proposed interferometer is capable of high temperature measurement up to 875 °C with a sensitivity of 92 pm/°C over repeated measurements. The explored wavelength drop point may limit the measurement range, which can be improved by repeated thermal annealing. View Full-Text
Keywords: fiber-optic sensor; Mach-Zehnder interferometer (MZI); high temperature fiber-optic sensor; Mach-Zehnder interferometer (MZI); high temperature
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Feng, Z.; Li, J.; Qiao, X.; Li, L.; Yang, H.; Hu, M. A Thermally Annealed Mach-Zehnder Interferometer for High Temperature Measurement. Sensors 2014, 14, 14210-14221.

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