Fibre optic sensor for the detection of adulterant traces in coconut oil

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Fibre optic sensor for the detection of adulterant traces in coconut oil

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dc.contributor.author Radhakrishnan, P
dc.contributor.author V P N Nampoori
dc.contributor.author Girijavallabhan, C P
dc.contributor.author Sheeba, M
dc.contributor.author Rajesh, M
dc.date.accessioned 2010-07-12T11:42:26Z
dc.date.available 2010-07-12T11:42:26Z
dc.date.issued 2005-10-04
dc.identifier.citation International School of Photonics, Cochin University of Science and Technology en_US
dc.identifier.other Meas. Sci. Technol. 16 (2005) 2247–2250
dc.identifier.other Doi: 10.1088/0957-0233/16/11/016
dc.identifier.uri http://dyuthi.cusat.ac.in/purl/1779
dc.description.abstract The design and development of a fibre optic evanescent wave refractometer for the detection of trace amounts of paraffin oil and palm oil in coconut oil is presented. This sensor is based on a side-polished plastic optical fibre. At the sensing region, the cladding and a small portion of the core are removed and the fibre nicely polished. The sensing region is fabricated in such a manner that it sits perfectly within a bent mould. This bending of the sensing region enhances its sensitivity. The oil mixture of different mix ratios is introduced into the sensing region and we observed a sharp decrease in the output intensity. The observed variation in the intensity is found to be linear and the detection limit is 2% (by volume) paraffin oil/palm oil in coconut oil. The resolution of this refractometric sensor is of the order of 10−3. Since coconut oil is consumed in large volumes as edible oil in south India, this fibre optic sensor finds great relevance for the detection of adulterants such as paraffin oil or palm oil which are readily miscible in coconut oil. The advantage of this type of sensor is that it is inexpensive and easy to set up. Another attraction of the side-polished fibre is that only a very small amount of analyte is needed and its response time is only 7 s. en_US
dc.language.iso en en_US
dc.publisher Measurement Science and Technology, Institute of Physics Publishing en_US
dc.subject evanescent wave refractometer en_US
dc.subject adulteration of oil en_US
dc.subject side-polished fibre en_US
dc.subject fibre optic sensor en_US
dc.title Fibre optic sensor for the detection of adulterant traces in coconut oil en_US
dc.type Working Paper en_US


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