title: A high sensitivity and wide dynamic range fiber-optic sensor for low-concentration VOC gas detection.
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.
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Korea. rajibur@ee.knu.ac.kr.
authors.forename: Md Rajibur Rahaman
authors.initials: MR
authors.lastname: Khan
authors.affiliation: School of Electronics Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, Daegu 702-701, Korea. swkang@knu.ac.kr.
authors.forename: Shin-Won
authors.initials: SW
authors.lastname: Kang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D005740:Gases / Q000032:analysis* / Q000737:chemistry; D008832:Microchemistry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055549:Volatile Organic Compounds / Q000032:analysis* / Q000737:chemistry
chemical_list: D005740:Gases; D055549:Volatile Organic Compounds