Low frequency finite difference time domain (FDTD) for modeling of inducedfields in humans close to line sources

The implementation of a low frequency line source as a source function in t he finite difference time domain (FDTD) method is presented. The total-scat tered field formulation is employed, along with a recently developed quasi- static formulation of the FDTD. Line-source modeling is important in the ut ility industry, where a more accurate prediction of the fields induced in w orkers in close proximity to power lines is required. The line-source repre sentation is verified, and excellent agreement with analytic solutions is f ound for two object problems. A practical example of the electric fields an d current densities induced in a human body in close proximity to a 60-Hz t ransmission line is evaluated. The results for predicted organ dosimetry fo r such a configuration are compared with predictions for the uniform electr ic field and demonstrate the induced fields and current densities can be si gnificantly higher than originally predicted for the uniform electric field exposure on a ground plane. (C) 2000 Academic Press.