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Open AccessArticle

High Temperature (Up to 950 °C) Sensor Based on Micro Taper In-Line Fiber Mach–Zehnder Interferometer

Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
National Engineering Laboratory for Destructive Testing and Optoelectronic Sensing Technology and Application, Nanchang HangKong University, Nanchang 330063, China
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China
Faculty of Engineering and Environment, Northumbria University, Newcastle Upon Tyne NE1 8ST, UK
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2394;
Received: 24 April 2019 / Revised: 30 May 2019 / Accepted: 6 June 2019 / Published: 12 June 2019
(This article belongs to the Special Issue Recent Progress in Fiber Optic Sensors: Bringing Light to Measurement)
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. An 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 the heating and cooling cycles, respectively, and, after two days, the sensor still had a sensitivity of 0.11 nm/°C, showing a good stability of the sensor. A probe-type fiber MZI was designed by cutting the sandwiched SMF, which has good linear temperature responses of 0.113 nm/°C over a large temperature range from 89 to 950 °C. The probe-type fiber MZI temperature sensor was independent to the surrounding refractive index (RI) and immune to strain. The developed sensor has a wide application prospect in the fields of high temperature hot gas flow, as well as oil and gas field development. View Full-Text
Keywords: optical fiber; Mach–Zehnder interferometer; high-temperature sensor optical fiber; Mach–Zehnder interferometer; high-temperature sensor
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MDPI and ACS Style

Liao, Y.-C.; Liu, B.; Liu, J.; Wan, S.-P.; He, X.-D.; Yuan, J.; Fan, X.; Wu, Q. High Temperature (Up to 950 °C) Sensor Based on Micro Taper In-Line Fiber Mach–Zehnder Interferometer. Appl. Sci. 2019, 9, 2394.

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