Detection of a Metal or Magnetic Object
申请公布号:US2013134968(A1)
申请号:US201113696363
申请日期:2011.03.08
申请公布日期:2013.05.30
发明人:ZIBOLD TOBIAS;ALBRECHT ANDREJ
分类号:G01N27/72
主分类号:G01N27/72
摘要:A measuring device configured to detect a metal object includes two emission coils configured to produce superimposed magnetic fields. The measuring device also includes a device configured to determine a differential voltage between the emission coils. The measuring device further includes a control device configured to supply the emission coils with alternating voltages such that the value of an AC voltage component of the differential voltage, which is time synchronized with the alternating voltage, is minimized. The control device is configured to detect the metal object when the ratio of the alternating voltages does not correspond to the ratio of the impedances of the emission coils when the metal object is not there.
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