1 October 1999 Optical sensor for determining adulteration in a liquid sample
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An optical sensor for determining the proportional composition of two liquids in a mixture is developed. It is based on observing changes in the reflected light intensity at the glass-mixture interface brought about by the changes in the proportion of one liquid over that of the other in the mixture. Sample mixtures for this investigation here have been prepared by changing the concentration of substances such as kerosene and diesel fuel in a fixed volume of petrol. A procedure for identifying as well as evaluating the concentration of kerosene or of diesel fuel or of a mixture of the two in a sample of petrol has been reported. Evaporation of these sample mixtures is carried out by exposing them to a constant flow of air at the same temperature as that of the sample mixtures. Experimental determination of the changes in the reflected intensity are carried out by using an arrangement in which one of the two isosceles surfaces of a right-angled isosceles prism is interfaced with the sample mixture. Experimentally determined values for some of these changes are compared with the theoretical estimates for them obtained from Fresnel's equation.
L. M. Bali, L. M. Bali, Atul Kumar Srivastava, Atul Kumar Srivastava, Rajesh Kumar Shukla, Rajesh Kumar Shukla, Anchal Srivastava, Anchal Srivastava, } "Optical sensor for determining adulteration in a liquid sample," Optical Engineering 38(10), (1 October 1999). https://doi.org/10.1117/1.602223 . Submission:


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