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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2495

Title: Long period gratings in multimode optical fibers: application in chemical sensing
Authors: Thomas Lee, S
Dinesh Kumar, S
Suresh, Kumar P
Radhakrishnan, P
Vallabhan, C P G
Nampoori, V P N
Keywords: Fiber sensor
Evanscent wave
Grating sensor
Multimode fiber
Long period grating
Issue Date: 2003
Publisher: Elsevier
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.
URI: http://dyuthi.cusat.ac.in/purl/2495
Appears in Collections:Dr.C P Girijavallabhan

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