Applications of optical fiber SPR sensor for measuring of temperature and concentration of liquids

Jie Zeng; Dakai Liang; Zhenxin Cao

doi:10.1117/12.623375

23 May 2005 Applications of optical fiber SPR sensor for measuring of temperature and concentration of liquids

Jie Zeng, Dakai Liang, Zhenxin Cao

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.623375
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

A novel optical fiber sensor based on surface plasmon resonance phenomenon that can be used for liquid temperature testing around the sensing probe is presented. According to the attribute of liquid refractive index decreasing with the rise of liquid temperature, a series of SPR spectrum curves, corresponding to temperature range from 10 °C to 90 °C, can be obtained from spectrum signal processing. The range of temperature testing can be adjusted by choosing liquids with different boil and refractive index as environmental medium. This paper analyzes theoretically the influence of a variety of liquid temperature on the metal film coated onto the sensing probe surface and the refractive index of fiber core. A real-time double-parameter testing involving resonance wavelength and the lowest light intensity reflectivity is also proposed. Moreover, the proportion concentration of mixed solutions with different refractive indices ranging from 1.3675 to 1.4281 refractive index units, including ethanol and glycol, is investigated utilizing relative spectrum measurement technology. The preliminary experiments confirm the feasibility of the optical fiber SPR sensor based on wavelength-interrogation for temperature and refractive index measurement.

Citation Download Citation

Jie Zeng, Dakai Liang, and Zhenxin Cao "Applications of optical fiber SPR sensor for measuring of temperature and concentration of liquids", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.623375

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