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Open AccessArticle

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

1
Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
2
National Engineering Laboratory for Destructive Testing and Optoelectronic Sensing Technology and Application, Nanchang HangKong University, Nanchang 330063, China
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State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
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State Key Lab of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai 200240, China
5
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; https://doi.org/10.3390/app9122394
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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