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Proceedings Paper

A miniature fiber-optic sensor for high-resolution and high-speed temperature sensing in ocean environment
Author(s): Guigen Liu; Ming Han; Weilin Hou; Silvia Matt; Wesley Goode
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Paper Abstract

Temperature measurement is one of the key quantifies in ocean research. Temperature variations on small and large scales are key to air-sea interactions and climate change, and also regulate circulation patterns, and heat exchange. The influence from rapid temperature changes within microstructures are can have strong impacts to optical and acoustical sensor performance. In this paper, we present an optical fiber sensor for the high-resolution and high-speed temperature profiling. The developed sensor consists of a thin piece of silicon wafer which forms a Fabry-Pérot interferometer (FPI) on the end of fiber. Due to the unique properties of silicon, such as large thermal diffusivity, notable thermo-optic effects and thermal expansion coefficients of silicon, the proposed sensor exhibits excellent sensitivity and fast response to temperature variation. The small mass of the tiny probe also contributes to a fast response due to the large surface-tovolume ratio. The high reflective index at infrared wavelength range and surface flatness of silicon endow the FPI a spectrum with high visibilities, leading to a superior temperature resolution along with a new data processing method developed by us. Experimental results indicate that the fiber-optic temperature sensor can achieve a temperature resolution better than 0.001°C with a sampling frequency as high as 2 kHz. In addition, the miniature footprint of the senor provide high spatial resolutions. Using this high performance thermometer, excellent characterization of the realtime temperature profile within the flow of water turbulence has been realized.

Paper Details

Date Published: 19 May 2015
PDF: 6 pages
Proc. SPIE 9459, Ocean Sensing and Monitoring VII, 94590I (19 May 2015); doi: 10.1117/12.2180168
Show Author Affiliations
Guigen Liu, Univ. of Nebraska-Lincoln (United States)
Ming Han, Univ. of Nebraska-Lincoln (United States)
Weilin Hou, U.S. Naval Research Lab. (United States)
Silvia Matt, U.S. Naval Research Lab. (United States)
Wesley Goode, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 9459:
Ocean Sensing and Monitoring VII
Weilin W. Hou; Robert A. Arnone, Editor(s)

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