Highly sensitive optical fiber temperature sensor based on resonance in sidewall of liquid-filled silica capillary tube

doi:10.1088/1674-1056/ab43be

Abstract A highly sensitive optical fiber temperature sensor based on a section of liquid-filled silica capillary tube (SCT) between single mode fibers is proposed. Two micro-holes are drilled on two sides of SCT directly by using femtosecond laser micromachining, and liquid polymer is filled into the SCT through the micro-holes without any air bubbles and then sealed by using ultra-violet (UV) cure adhesive. The sidewall of the SCT forms a Fabry-Perot resonator, and loss peaks are achieved in the transmission spectrum of the SCT at the resonant wavelength. The resonance condition can be influenced by the refractive index variation of the liquid polymer filled in SCT, which is sensitive to temperature due to its high thermo-optical coefficient (-2.98×10^-4℃^-1). The experimental result shows that the temperature sensitivity of the proposed fiber structure reaches 5.09 nm/℃ with a perfect linearity of 99.8%. In addition, it exhibits good repeatability and reliability in temperature sensing application.

Keywords: optical fiber sensors liquid filling temperature measurement

Received: 10 July 2019
Revised: 02 September 2019
Accepted manuscript online:

PACS:	42.81.-i	(Fiber optics)
	42.81.Pa	(Sensors, gyros)
	42.25.Hz	(Interference)
	82.35.-x	(Polymers: properties; reactions; polymerization)

Fund: Project supported by the Scientific Research Project of Institutions of Higher Learning in Inner Mongolia Autonomous Region, China (Grant No. NJZY19214).

Corresponding Authors: Min Li
E-mail: phdlimin@163.com

Cite this article:

Min Li(李敏), Biao Feng(冯彪), Jiwen Yin(尹辑文) Highly sensitive optical fiber temperature sensor based on resonance in sidewall of liquid-filled silica capillary tube 2019 Chin. Phys. B 28 114201

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Highly sensitive optical fiber temperature sensor based on resonance in sidewall of liquid-filled silica capillary tube

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