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Detection and analysis of paraffin oil adulteration in coconut oil using fiber optic long period grating sensor |
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| Authors: | TM Libish J Linesh P Biswas K Dasgupta |
| Institution: | a International School of Photonics, Cochin University of Science and Technology, Cochin 22, Kerala, India b Central Glass and Ceramic Research Institute, (A unit lab of CSIR), Kolkata, India c S.C.T. College of Engineering, Trivandrum, Kerala, India |
| Abstract: | A fiber optic sensing system for the detection of adulteration of coconut oil by paraffin oil is experimentally demonstrated. The sensing mechanism is based on the sensitive dependence of the resonance peaks of a long period grating (LPG) on the changes of the refractive index of the environmental medium surrounding the cladding surface of the grating. The wavelength shift of the attenuation bands of the LPG was measured with the sensor immersed in a mixture of paraffin oil and pure coconut oil in different proportions. Detection limit of adulteration was found to be 3% for coconut oil-paraffin oil binary mixture. |
| Keywords: | Long period grating Coconut oil adulteration Refractive index sensor Optical fiber sensor |
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