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Sensors 2014, 14(8), 14873-14884;

Liquid Seal for Temperature Sensing with Fiber-Optic Refractometers

Faculty of Information Technology, Macau University of Science and Technology, Macao, China
College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China
Author to whom correspondence should be addressed.
Received: 14 June 2014 / Revised: 4 August 2014 / Accepted: 5 August 2014 / Published: 13 August 2014
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [1694 KB, uploaded 13 August 2014]


Liquid sealing is an effective method to convert a fiber-optic refractometer into a simple and highly sensitive temperature sensor. A refractometer based on the thin-core fiber modal interferometer is sealed in a capillary tube filled with Cargille oil. Due to the thermo-optic effect of the sealing liquid, the high refractive-index sensitivity refractometer is subsequently sensitive to the ambient temperature. It is found that the liquid-sealed sensor produces a highest sensitivity of −2.30 nm/°C, which is over 250 times higher than its intrinsic sensitivity before sealing and significantly higher than that of a grating-based fiber sensors. The sensing mechanisms, including the incidental temperature-induced strain effect, are analyzed in detail both theoretically and experimentally. The liquid sealing technique is easy and low cost, and makes the sensor robust and insensitive to the surrounding refractive index. It can be applied to other fiber-optic refractometers for temperature sensing. View Full-Text
Keywords: fiber-optic refractometer; temperature sensor; liquid seal; thermo-optic effect fiber-optic refractometer; temperature sensor; liquid seal; thermo-optic effect
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Xu, B.; Li, J.; Li, Y.; Xie, J.; Dong, X. Liquid Seal for Temperature Sensing with Fiber-Optic Refractometers. Sensors 2014, 14, 14873-14884.

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