The paper focuses on the distortions introduced by low frequency magnetic field meters in the measurement of pulsed or periodic quasi-rectangular waveforms, such as those experienced near welding devices or Magnetic Resonance Imaging (MRI) machines. Starting from the meter frequency response, evaluated by generating reference sinusoidal magnetic fields up to a hundred of hertz, a circuital model is worked out, which reproduces the distortions of the measured signal due to the meter input high pass filter. By making use of the modelled filter, a time domain reconstruction procedure is implemented that allows the reproduction of the actual magnetic field shape starting from the measured behaviour.
Problems in the detection of Quasi-Rectangular magnetic flux density waveforms / Crotti, Gabriella; Giordano, Domenico. - (2011). ( 18th Symposium IMEKO TC4 Nadal (Brazil) 27-30 Sept 2011).
Problems in the detection of Quasi-Rectangular magnetic flux density waveforms
CROTTI, GABRIELLA;GIORDANO, DOMENICO
2011
Abstract
The paper focuses on the distortions introduced by low frequency magnetic field meters in the measurement of pulsed or periodic quasi-rectangular waveforms, such as those experienced near welding devices or Magnetic Resonance Imaging (MRI) machines. Starting from the meter frequency response, evaluated by generating reference sinusoidal magnetic fields up to a hundred of hertz, a circuital model is worked out, which reproduces the distortions of the measured signal due to the meter input high pass filter. By making use of the modelled filter, a time domain reconstruction procedure is implemented that allows the reproduction of the actual magnetic field shape starting from the measured behaviour.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
