Measurement evaluations of static and low frequency magnetic fields in the near field region

Manmade electromagnetic (EM) field in the low frequency range of the spectrum, from static to 200 kHz has caused interference with electronic equipment and poses a possible public health risk. Typical sources of these EM emissions include television sets, video display terminals (VDT), electric appliances, fluorescent lights, certain medical devices, walk-through and hand-held detectors, radio stations, induction heating, wireless electricity delivered over distance, hybrid cars and transmission lines. Our main goals for writing this paper are, first, to describe taking measurements of the frequencies and magnetic field levels in residential and occupational environments, particularly around cathode ray tube displays, induction heating units, and hybrid cars; and, second, to compare the measurements to the established or recommended limits according to national standards so that engineers and scientists can understand these nontrivial electrical measurements. The field measurements were carried out using different kinds of devices where a brief description of the instruments used is also provided. (C) 2011 Elsevier Ltd. All rights reserved.