title: Optical detection of volatile organic compounds using selective tensile effects of a polymer-coated fiber Bragg grating.
abstract: We demonstrated a novel selective chemical sensing approach by incorporating a poly(dimethylsiloxane) (PDMS)-coated fiber Bragg grating (FBG) structure for optically detecting various volatile organic compounds (VOC's). When the proposed structure is exposed to a nonpolar solvent, a tensile stress is induced between the coated PDMS and the optical fiber by a VOC-dependent swelling effect of the PDMS, which results in a Bragg wavelength shift dependent on the concentration and the type of VOC's. Because of no need of an etching process of a fiber cladding, the proposed PDMS-coated FBG can be used as a simple, convenient, and durable chemical sensing element with a high sensitivity, compared with conventional FBG sensors requiring an evanescent wave coupling.
authors.affiliation: Department of Sensor and Display Engineering, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: Chang-sub
authors.initials: CS
authors.lastname: Park
authors.forename: Yeonjeong
authors.initials: Y
authors.lastname: Han
authors.forename: Kyung-Il
authors.initials: KI
authors.lastname: Joo
authors.forename: Yong Wook
authors.initials: YW
authors.lastname: Lee
authors.forename: Shin-Won
authors.initials: SW
authors.lastname: Kang
authors.forename: Hak-Rin
authors.initials: HR
authors.lastname: Kim
mesh_terms: D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D005336:Fiber Optic Technology / Q000379:methods*; D055100:Optical Fibers; D012995:Solubility; D013057:Spectrum Analysis; D013718:Tensile Strength; D013997:Time Factors; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D004129:Dimethylpolysiloxanes; D055549:Volatile Organic Compounds