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Sensors 2014, 14(10), 18515-18525;

Temperature Sensing in Seawater Based on Microfiber Knot Resonator

Department of Physics, College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
Author to whom correspondence should be addressed.
Received: 21 July 2014 / Revised: 26 August 2014 / Accepted: 17 September 2014 / Published: 8 October 2014
(This article belongs to the Special Issue Resonant Sensors and Sensor Fusion)
Full-Text   |   PDF [1562 KB, uploaded 8 October 2014]


Ocean internal-wave phenomena occur with the variation in seawater vertical temperature, and most internal-wave detections are dependent on the measurement of seawater vertical temperature. A seawater temperature sensor based on a microfiber knot resonator (MKR) is designed theoretically and demonstrated experimentally in this paper. Especially, the dependences of sensing sensitivity on fiber diameter and probing wavelength are studied. Calculated results show that sensing sensitivity increases with the increasing microfiber diameter with the range of 2.30–3.91 μm and increases with the increasing probing wavelength, which reach good agreement with results obtained by experiments. By choosing the appropriate parameters, the maximum sensitivity measured can reach to be 22.81 pm/°C. The seawater temperature sensor demonstrated here shows advantages of small size, high sensitivity, easy fabrication, and easy integration with fiber systems, which may offer a new optical method to detect temperature of seawater or ocean internal-wave phenomenon and offer valuable reference for assembling micro sensors used for other parameters related to seawater, such as salinity, refractive index, concentration of NO3 and so on. View Full-Text
Keywords: microfiber; knot resonator; seawater temperature; sensing; ocean internal-wave microfiber; knot resonator; seawater temperature; sensing; ocean internal-wave
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Yang, H.; Wang, S.; Wang, X.; Wang, J.; Liao, Y. Temperature Sensing in Seawater Based on Microfiber Knot Resonator. Sensors 2014, 14, 18515-18525.

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