A High-Sensitivity Low-Temperature Sensor Based on Michelson Interferometer in Seven-Core Fiber
- 23 September 2021
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 33 (23), 1293-1296
- https://doi.org/10.1109/lpt.2021.3115249
Abstract
An in-fiber Michelson interferometer (MI) formed by seven-core fiber (SCF) for low-temperature sensing is proposed and experimentally demonstrated. The sensor head is constructed by a section of seven-core fiber splicing a single-mode fiber (SMF) with a taper. When the external temperature changes, the interference spectrum of the MI will shift due to thermal expansion and thermo-optic effects. By measuring the wavelength variations of the interference dip, the external temperature can be determined. Experimental results proves that the sensor exhibits a maximum linear temperature sensitivity of -0.0775 nm/°C in the temperature range of -60 °C to 15 °C, and the standard deviation is 5% in stability test. The sensor possesses high sensitivity and easy fabrication, which makes it could be a good candidate in low-temperature sensing application.Keywords
Funding Information
- National Natural Science Foundation of China (61805197)
- Graduate Student Innovation Fund of Xi’an Shiyou University (YCS20111010)
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