23 April 2017 A novel inter-fibre light coupling sensor probe using plastic optical fibre for ethanol concentration monitoring at initial production rate
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103233Y (2017) https://doi.org/10.1117/12.2265377
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
A novel, low cost and highly sensitive optical fibre probe sensor for concentration measurement of ethanol solvent (C2H5OH) corresponding to bio-ethanol production rate by an algae is reported. The principle of operation of the sensor is based on inter-fibre light coupling through an evanescent field interaction to couple the light between two multimode fibres mounted parallel to each other at a minimum possible separation i.e. ~ < 1mm. The sensor was fabricated using a low cost 1000um plastic optical fibre (POF) and was characterized for real time measurement in the broadband spectrum including visible and near infra-red. The wavelength dependency of this sensor design was also investigated by post processing analysis of real time data and hence the optimum wavelength range determined. The proposed sensor has shown significant response in the range of 0.005 – 0.1 %v/v (%volume/volume or volume concentration) which depicts the high sensitivity for monitoring very minute changes in concentration corresponding refractive index changes of the solution. Numerically, sensor has shown the sensitivity of 21945 intensity counts/%v/v or 109.7 counts per every 0.0050 %v/v.
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Sanober F. Memon, Sanober F. Memon, Elfed Lewis, Elfed Lewis, J. Tony Pembroke, J. Tony Pembroke, Bhawani S. Chowdhry, Bhawani S. Chowdhry, } "A novel inter-fibre light coupling sensor probe using plastic optical fibre for ethanol concentration monitoring at initial production rate", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103233Y (23 April 2017); doi: 10.1117/12.2265377; https://doi.org/10.1117/12.2265377
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