High temperature (up to 950 °C) sensor based on micro taper in-line fiber Mach-Zehnder interferometer

Yun-Cheng Liao, Bin Liu, Juan Liu, Sheng-Peng Wan, Xing-Dao He, Jinhui Yuan, Xinyu Fan, Qiang Wu

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Abstract

A high temperature (up to 950 °C) sensor was proposed and demonstrated based on a micro taper in-line fiber Mach-Zehnder interferometer (MZI) structure. The fiber MZI structure comprises a single mode fiber (SMF) with two micro tapers along its longitudinal direction. Annealing at 1000 °C was applied to the fiber sensor to stabilize the temperature measurement. The experimental results showed that the sensitivity was 0.114 nm/°C and 0.116 nm/°C for heating and cooling cycle, respectively, and, after two days the sensor still has sensitivity of 0.11 nm/°C, showing good stability of the sensor. An probe-type fiber MZI is designed by cutting the sandwiched SMF, which has good linear temperature responses of 0.113 nm/°C over large temperature range from 89 °C to 950 °C. The probe-type fiber MZI temperature sensor is independent to the surrounding RI and immunity to strain. The developed sensor has a wide application prospect in the fields of high temperature hot gas flow and oil and gas field development.
Original languageEnglish
Article number2394
Number of pages11
JournalApplied Sciences
Volume9
DOIs
Publication statusPublished - 12 Jun 2019

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