Abstract

In this paper, a non destructive approach for detection of adulteration in edible oils using an open complementary split ring resonator (OCSRR) structure is presented. The pro-posed OCSRR based RF sensor is designed on a 1.6 mm thick FR4 substrate ($\epsilon _{r}$=4.4) to operate at 3.6 GHz. The adulteration analysis in this study is carried out for various samples of mustard, coconut, olive and sunflower oils. A sample holder is placed such that the oil sample under test is in direct contact with the manufactured OCSRR sensor. The shift in the resonant frequency of the OCSRR is observed and the permittivity values of the oil samples are extracted from the simulation results and practical measurements. In addition, the percentage of adulterant in an oil sample is estimated by studying the dielectric properties of the sample under test. About 50% of adulteration in edible oils can be detected using this procedure and the numerical sensitivity (NS) of the proposed sensor lies in between 11.67% -18.33% for different oil samples.

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