Dr. Arthur Kirkland Profile

Dr. Arthur Kirkland

at Univ of Electronic Science and Technology of China

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Proceedings Article | 12 March 2019 Paper

Optical fiber gas sensor based on organic polymer

Zinan Wu, Donglin Tang, Yanyan Wang, Zhiyong Dai

Proceedings Volume 11023, 1102313 (2019) https://doi.org/10.1117/12.2521223

KEYWORDS: Polymers, Optical fibers, Hydrogen, Refractive index, Gas sensors, Photorefractive polymers, Polymer optical fibers, Absorption, Gases, Polymeric sensors

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This paper proposed a method of optical fiber gas sensing which based on the detection of sensitive phase of light wave combined with organic polymers, simultaneously, the experimental verification was given. We found that the refractive index of the organic polymer will change accompanied with the change of concentrations of acid gases that act with the organic polymer. So, we put the organic polymer film into the optical fiber Fabry-Perot (F-P) cavity and analyze the spectral characteristics of the output of the optical fiber F-P cavity, then, we realize the hydrogen sulfide gas sensing. Experimental results show that the refractive index of organic polymer decreasing when the concentration of the gas under the test is increasing. At low concentration, a system resolution record of 3.0455 ~ 4.7777 × 10⁻⁵m/%VOL is obtained, phase sensitivity is found to be 1.94 ×10² rad/%VOL and concentration resolution is found to be 5.15 x 10^-3 ppm. Through this test, we proved the possibility by using organic polymer to realize the sensing of gas. In general, this scheme can be applied to high-precision measurement of carbon dioxide, hydrogen sulfide and other gases in the petrochemical field.

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