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

Sensors

Md. Rajibur Rahaman Khan¹ 

[1] School of Electronics Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Korea; E-Mail

关键词: fiber-optic sensor;    frequency modulation;    volatile organic compound;    solvatochromism;    side-polished optical fiber;   

DOI  :  10.3390/s141223321

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.