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Journal of Intelligent Material Systems and Structures
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Application of Fiber Optic Surface Plasmon Resonance Sensor for Measuring Liquid Refractive Index

Jie Zeng

The Aeronautical Science Key Laboratory for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China, zengjiez{at}yahoo.com.cn

Dakai Liang

The Aeronautical Science Key Laboratory for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

An optical fiber sensor based on surface plasmon resonance (SPR) phenomenon that can be used for liquid refractive index testing is presented in this article. The effect of various parameters like the refractive index of the core and the liquid type on the shape of the SPR spectrum is analyzed, utilizing relative spectrum measurement technology. The relationship curves between several kinds of liquids with the same refractive index with their resonance wavelengths are also obtained using the sensing probe. Furthermore, experimental results of liquids with high refractive index reveal that the improved probe with SiO film has the ability to extend the detection upper limit of refractive index and keep the toughness of optical fiber at the same time.

Key Words: surface plasmon resonance • optical fiber sensor • refractive index • SiO film

This version was published on September 1, 2006

Journal of Intelligent Material Systems and Structures, Vol. 17, No. 8-9, 787-791 (2006)
DOI: 10.1177/1045389X06057524
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