Non-stationary electromagnetic field measurements accuracy improvement |
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Authors: | Tomasz Dlugosz Hubert Trzaska |
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Institution: | (1) EM Environment Protection Lab, Technical University of Wroclaw, Wyspianskiego 27, 50-370 Wroclaw, Poland |
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Abstract: | Electromagnetic field (EMF) measurements, for labor safety and environment protection purposes, are performed in the near-field.
Inaccuracy of the far-field EMF measurements oscillates around ±1 dB or bit worse; in the near-field measurements, errors
at the level of ±6 dB must be sometimes accepted. In the case of non-stationary EMF measurements, their sense may be changed
from quantitative to qualitative ones. In order to make it possible an estimation of the non-stationary EMF measurement accuracy,
it is proposed new method of the meters calibration. The method is based upon a standard excitation with identical signal
as the measured one. A set for the purpose includes a pulse generator (of frequency and pulse rating identical with the radiation
source) and computer-controlled amplitude modulator that reflects the radiation pattern of an antenna (e.g. radar one) and
its rotations. Contrary to calibration using monochromatic continuous wave (CW) excitation, proposed method should be repeated
for any radiation source. The disadvantage is compensated by a possibility to estimate (additional) error of the method. Calculations
show it at the level of 10%. |
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Keywords: | |
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