DETECTING DISSIMILARITIES IN EM CONSTITUTIVE PARAMETERS USING DIFFERENTIAL IMAGING OPERATOR ON RECONSTRUCTED WAVEFIELD

Electromagnetic fleld will scatter when incident on boundaries separating media with difierent constitutive parameters. This paper demonstrates the use of a difierential operator on recorded scattered waves to reveal the shape of the boundary. The method is noninvasive and is composed of three phases. First, the area of interest is illuminated and the resulting scattered electromagnetic flelds are recorded. In the 2nd phase, the captured data is numerically reverse simulated in time to reconstruct the fleld distribution in the region of interest. Finally, the difierential imaging operator is applied on the reconstructed wave fleld, creating an image delineating the boundary where scattered flelds originated. This technique does not require the knowledge of location of the boundaries nor the nature of the discontinuity in the constitutive parameters. The proposed imaging system is scalable, whereby modiflcation of the source signal, recorder sampling, and numerical model allows imaging objects of smaller dimensions and creation of sharper and more accurate images.