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Abstract
In this paper, a polymer polyhexamethylene biguanide (PHMB) based Fabry-Perot (FP) interferometric optical fiber sensor for carbon dioxide gas detection at atmospheric pressure is investigated and experimentally demonstrated. The absorption and release of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> gas molecules lead to the refractive index change of the PHMB. The length of CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> sensitive FP cavity can be easily controlled by using the Czochralski method. The real-time measurement result shows that CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> gas concentration with a sensitivity of 12.2 pm/ppm in a 0-700 ppm range can be achieved.
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