Nondestructive technique for detection of adulteration in edible oils using planar RF sensor

摘要

In this paper, a non destructive technique is presented for detection of adulteration in common edible oils using the proposed microwave planar resonant sensor. The proposed sensor is operating in the ISM (industrial, scientific and medical) frequency band of 5.85 GHz. The sensor is designed using the full wave electromagnetic solver, the CST Microwave Studio, and an empirical model of the proposed sensor is developed for the accurate calculation of complex permittivity of standard edible oil samples under test in terms of the resonant frequency under loaded condition. The developed model is then used to detect the percentage adulteration of contaminants in the pure edible oil samples. The designed resonant sensor is fabricated on a 1.6 mm FR4 substrate. A sample container made of borosilicate glass is specially designed to make the overall procedure to be non-contacting and nondestructive. The fabricated sensor is finally tested for detecting adulteration with different concentration levels in edible oils.