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5 November 2020 Ammonium ion detection using a tilted fiber grating sensor
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Proceedings Volume 11569, AOPC 2020: Optical Information and Network; 115690B (2020) https://doi.org/10.1117/12.2579739
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China
Abstract
We propose a tilted fiber grating (TFG) sensor for ammonium ion detection in aqueous solution. The sensor is made by coating a nano-film of polyvinylidene-fluoride-bromothymol-blue (PVDF-BTB) over the TFG surface. As the ammonium ion can react with the bromothymol blue, the smoothness of the PVDF-BTB film will be destroyed, leading to the transmission spectrum changing correspondingly. The reaction strength between the ammonium ion and the bromothymol blue is proportional to the concentration of ammonium ion. Therefore, through monitoring the change of a selected cladding mode in the transmission spectrum with time, we can measure the concentration of ammonium ion. Experimental results show that our sensor can detect ammonium ion in concentration as low as 1 mg/L within 140 seconds, and after that the intensity variation of the monitored mode almost keeps stable, which agrees with the theoretical analysis. Furthermore, through monitoring the core mode during the experiment, we can eliminate the temperature-induced cross-sensitivity, thus improving the measured accuracy of the sensor. Our proposed TFG sensor for ammonium ion detection has advantages of simple structure, easy fabrication and comparable performances.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Penglei Ma, Jiajian Ruan, and Xiaoyong Chen "Ammonium ion detection using a tilted fiber grating sensor", Proc. SPIE 11569, AOPC 2020: Optical Information and Network, 115690B (5 November 2020); https://doi.org/10.1117/12.2579739
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