Effect and compensation of ADC nonlinearity on magnetic accommodation measurements

Attivissimo, Filippo; Giaquinto, Nicola; Marracci, Mirko; Tellini, Bernardo

doi:10.1016/j.measurement.2012.11.006

Cited by 9 publications

(1 citation statement)

References 40 publications

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“…Voltage signal integration can be usefully employed also to measure a time-varying magnetic flux linked to a circuit, from the measurement of the induced voltage on that circuit. This technique was recently applied by the authors for characterization of magnetic materials via inductive methods to investigate magnetic accommodation of minor asymmetric loops [5] and to pulse current measurements on an electromagnetic rail launcher, with the aim of measuring the current distribution between the armature brushes [6][7][8][9]. In more detail, in the specific case of the rail launcher a set of pickup loops was placed near the brushes and the voltage pulses induced on the loops were acquired; the integration of these signals provided the magnetic fluxes linked to the loops and from them the unknown brush currents could be reconstructed.…”

Section: Introductionmentioning

confidence: 99%

Accurate Magnetic Flux Measurements in Electromagnetic Rail Launchers

Ferrero¹,

Marracci²,

Tellini³

2013

PIER C

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This paper deals with the measurement of the magnetic flux generated by the armature of electromagnetic rail launchers linked with external pickup loops. In particular we discuss possible methods to experimentally evaluate measurement uncertainty when the magnetic flux is obtained by numerical voltage integration. These methods aim at an approximate identification of the correlation among voltage samples introduced by the analog-to-digital converter, only based on the available measurements without requiring additional tests and instruments. An estimate of this correlation allows to better evaluate the overall measurement uncertainty, thus providing the applicability limits of the proposed inductive technique and contributing to a better understanding of the current and force distribution in the armature.

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