Long period gratings in multimode optical fibers: application in chemical sensing

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Long period gratings in multimode optical fibers: application in chemical sensing

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dc.contributor.author Thomas Lee, S
dc.contributor.author Dinesh Kumar, S
dc.contributor.author Suresh Kumar, P
dc.contributor.author Radhakrishnan, P
dc.contributor.author Vallabhan, C P G
dc.contributor.author Nampoori, V P N
dc.date.accessioned 2011-11-08T09:03:59Z
dc.date.available 2011-11-08T09:03:59Z
dc.date.issued 2003
dc.identifier.uri http://dyuthi.cusat.ac.in/purl/2495
dc.description.abstract We propose and demonstrate a new technique for evanescent wave chemical sensing by writing long period gratings in a bare multimode plastic clad silica fiber. The sensing length of the present sensor is only 10 mm, but is as sensitive as a conventional unclad evanescent wave sensor having about 100 mm sensing length. The minimum measurable concentration of the sensor reported here is 10 nmol/l and the operating range is more than 4 orders of magnitude. Moreover, the detection is carried out in two independent detection configurations viz., bright field detection scheme that detects the core-mode power and dark field detection scheme that detects the cladding mode power. The use of such a double detection scheme definitely enhances the reliability and accuracy of the results. Furthermore, the cladding of the present fiber need not be removed as done in conventional evanescent wave fiber sensors. en_US
dc.description.sponsorship Cochin University of Science and Technology en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Fiber sensor en_US
dc.subject Evanscent wave en_US
dc.subject Grating sensor en_US
dc.subject Multimode fiber en_US
dc.subject Long period grating en_US
dc.subject Absorption en_US
dc.title Long period gratings in multimode optical fibers: application in chemical sensing en_US
dc.type Working Paper en_US
dc.contributor.faculty Technology en_US


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