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Sensors 2014, 14(12), 23321-23336; doi:10.3390/s141223321

A High Sensitivity and Wide Dynamic Range Fiber-Optic Sensor for Low-Concentration VOC Gas Detection

School of Electronics Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Korea
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Received: 27 October 2014 / Revised: 28 November 2014 / Accepted: 2 December 2014 / Published: 5 December 2014
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
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Abstract

In this paper, we propose a volatile organic compound (VOC) gas sensing system with high sensitivity and a wide dynamic range that is based on the principle of the heterodyne frequency modulation method. According to this method, the time period of the sensing signal shift when Nile Red containing a VOC-sensitive membrane of a fiber-optic sensing element comes into contact with a VOC. This sensing membrane produces strong, fast and reversible signals when exposed to VOC gases. The response and recovery times of the proposed sensing system were less than 35 s, and good reproducibility and accuracy were obtained. View Full-Text
Keywords: fiber-optic sensor; frequency modulation; volatile organic compound; solvatochromism; side-polished optical fiber fiber-optic sensor; frequency modulation; volatile organic compound; solvatochromism; side-polished optical fiber
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Khan, M.R.R.; Kang, S.-W. A High Sensitivity and Wide Dynamic Range Fiber-Optic Sensor for Low-Concentration VOC Gas Detection. Sensors 2014, 14, 23321-23336.

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