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dc.contributor.authorBarnes, Jack A.
dc.contributor.authorBrown, R. Stephen
dc.contributor.authorCipot-Wechsler, Judy
dc.contributor.authorCrudden, M. Cathleen
dc.contributor.authorDu, Jenny
dc.contributor.authorLoock, Hans-Peter
dc.contributor.authorPlett, Krista
dc.date.accessioned2016-03-21T15:33:33Z
dc.date.available2016-03-21T15:33:33Z
dc.date.issued2016-03-21
dc.identifier.issn0277-786X
dc.identifier.otherdoi:10.1117/12.806722
dc.identifier.urihttp://hdl.handle.net/1974/14136
dc.description.abstractA chemical sensor system consisting of a coated long period grating, which was spliced into a fiber loop cavity, has been prepared and characterized. Designer coatings based on polydimethylsiloxane and nanostructured organically modified silica (ORMOSIL) materials were prepared to provide enhanced sensitivity for a variety of key environmental pollutants. Upon microextraction of the analyte into the polymer matrix, an increase in the refractive index of the coating resulted in a change of the attenuation spectrum of the long period grating. The grating was interrogated using ring-down detection as a means to amplify the optical loss and to gain stability against misalignment and laser power fluctuations. Chemical differentiation of cyclohexane and xylenes was achieved and a detection limit of 300 ppm of xylenes vapour in air was readily realized for PDMS coatings. Ormosil-type coatings were capable of detecting lead cations at concentrations below 1 ppm in water.en_US
dc.language.isoenen_US
dc.subjectLong-Period Grating (LPG)en_US
dc.subjectSolid-Phase Microextraction (SPME)en_US
dc.subjectChemical Sensoren_US
dc.subjectCavity Ring-Down (CRD)en_US
dc.subjectFiber-Loop Ring-Down (FLRD)en_US
dc.subjectMesoporous Silica (SBA-15)en_US
dc.subjectMesoporous Silicateen_US
dc.titleLong-Period Gratings in Chemical Sensingen_US
dc.typeArticleen_US


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