Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water

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Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water

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dc.contributor.author Girijavallabhan, C P
dc.contributor.author V P N Nampoori
dc.contributor.author Radhakrishnan, P
dc.contributor.author Thomas Lee, S
dc.contributor.author Suresh, Kumar P
dc.contributor.author Unnikrishnan, K P
dc.contributor.author Sugunan, S
dc.date.accessioned 2008-08-22T10:16:34Z
dc.date.available 2008-08-22T10:16:34Z
dc.date.issued 2003-04-24
dc.identifier.other Meas. Sci. Technol. 14 (2003) 858–861
dc.identifier.uri http://dyuthi.cusat.ac.in/purl/737
dc.description.abstract In this communication, we discuss the details of fabricating an off-line fibre optic sensor (FOS) based on evanescent wave absorption for detecting trace amounts of Fe3+ in water. Two types of FOS are developed; one type uses the unclad portion of a multimode silica fibre as the sensing region whereas the other employs the microbent portion of a multimode plastic fibre as the sensing region. Sensing is performed by measuring the absorption of the evanescent wave in a reagent medium surrounding the sensing region. To evaluate the relative merits of the two types of FOS in Fe3+ sensing, a comparative study of the sensors is made, which reveals the superiority of the latter in many respects, such as smaller sensing length, use of a double detection scheme (for detecting both core and cladding modes) and higher sensitivity of cladding mode detection at an intermediate range of concentration along with the added advantage that plastic fibres are inexpensive. A detection limit of 1 ppb is observed in both types of fibre and the range of detection can be as large as 1 ppb–50 ppm. All the measurements are carried out using a LabVIEW set-up. en_US
dc.language.iso en en_US
dc.publisher INSTITUTE OF PHYSICS PUBLISHING en_US
dc.subject evanescent wave en_US
dc.subject iron detection en_US
dc.subject microbent en_US
dc.subject fibre sensor en_US
dc.subject pollution monitoring en_US
dc.title Evanescent wave fibre optic sensors for trace analysis of Fe3+ in water en_US
dc.type Working Paper en_US


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