Because the amplitude and the frequency of the generated
field changes constantly over time, the maximum, rather
than the root-mean-square (rms), values of the magnetic
flux density were measured, as shown in [11]. This field frequency
variability led us to measure and depict, in the work
presented in this article, only the percentage of the 1998 ICNIRP
reference values for the exposure of the general public.
More specifically, it was observed that the major components
of the magnetic flux density appeared at frequencies
lower than 100 Hz. For the definition of the rms signal field
spectrum, the fast Fourier transform mode was used at 1-Hz
spectral resolution in the range 5 Hz–2 KHz.