22 November 2011 Optical fiber evanesent field sensors without additional functionalized material
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Proceedings Volume 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 81990D (2011) https://doi.org/10.1117/12.905004
Event: International Conference on Optical Instruments and Technology (OIT2011), 2011, Beijing, Beijing, China
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.
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Xiaokang Zhang, Xiaokang Zhang, Zhuoyong Deng, Zhuoyong Deng, Hanlang Xu, Hanlang Xu, Haihong Xu, Haihong Xu, } "Optical fiber evanesent field sensors without additional functionalized material", Proc. SPIE 8199, 2011 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 81990D (22 November 2011); doi: 10.1117/12.905004; https://doi.org/10.1117/12.905004
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