Induction cookers use an intermediate frequency magnetic field to heat the cooking vessel. The magnetic flux density produced by an induction cooker during operation was measured according to the standards, and the measured values were below the limits set there. Measurements were used to validate a numerical model of a cooker consisting of three vertically displaced coaxial current loops at 35 kHz. The results show that the magnetic fields produced by induction cookers do not cause the basic restriction for the internal electric field to be exceeded in children or foetuses, even when the field is increased by a factor of 5, which can happen when the cookware is inappropriate and/or miss-aligned. The induced current density, however, is relatively close to its basic restriction and could potentially exceed it even for induction cookers in compliance with the currently valid standard (EN 62233).
COBISS.SI-ID: 8589652
We investigated occupational exposure to EMF of a multi-band base station antenna at 900, 1800, and 2100 MHz. Special attention was given to simultaneous exposure to several frequencies, their interaction and the additivity of resulting SAR. The 2100 MHz exposure results in highest spatial-peak SAR averaged over 10 g of tissue, while whole-body SAR is similar at all three frequencies. At distances above 200 mm from the antenna, whole-body SAR is a more limiting factor for compliance to exposure guidelines, while at shorter distances spatial-peak SAR is more limiting. For evaluation of combined exposure, a simple summation of spatial-peak SAR maxima at each frequency gives a good conservative estimate, but it was found to depend on the distribution of transmitting power between the different frequency bands.
COBISS.SI-ID: 8222804