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Proceedings Paper

Optical fiber evanesent field sensors without additional functionalized material
Author(s): Xiaokang Zhang; Zhuoyong Deng; Hanlang Xu; Haihong Xu
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Paper Abstract

We have proposed a novel evanescent field (EF) sensor without any additional functionalized material. The sensors were fabricated by single mode fiber with a etched section on it. We study the properties of the optical intensities out of the sensors in the condition of immersing them in water, placing into a vacuum chamber or a climatic chamber. It was demonstrated that this EF sensors can senses the changes of the RI of water surrounding it. And the change of the output of the sensors occurs with a oscillation mode. We also show that the EF sensor with 11μm of outer diameter is sensitive to a change of RI with a magnitude of power of negative 7. Using this type of sensor, we demonstrate the vacuum sensing in the range from 20 to 300Pa. It is also demonstrated that the output of the sensors can be obviously attenuated by the scattering of the water vapor surrounding the sensing section. With adequate design of fiber, we believe that the new EF sensors can offer a platform on which the EF directly interacts with the materials of liquid or gas surrounding the sensing section and give the information of the changes in the RI of the materials and the scattering or obsorption to the evanescent field.

Paper Details

Date Published: 23 November 2011
PDF: 8 pages
Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990D (23 November 2011); doi: 10.1117/12.905004
Show Author Affiliations
Xiaokang Zhang, South China Univ. of Technology (China)
Zhuoyong Deng, South China Univ. of Technology (China)
Hanlang Xu, South China Univ. of Technology (China)
Haihong Xu, South China Univ. of Technology (China)


Published in SPIE Proceedings Vol. 8199:
2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications
Brian Culshaw; YanBiao Liao; Anbo Wang; Xiaoyi Bao; Xudong Fan, Editor(s)

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