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METHOD AND DEVICE FOR MEASURING THE THICKNESS OF A COATING LAYER ON A RUNNING STRIP

  • US 20130133575A1
  • Filed: 05/30/2011
  • Published: 05/30/2013
  • Est. Priority Date: 05/31/2010
  • Status: Active Grant
First Claim
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1. A method measuring a thickness of a coating material layer of a running strip using a sensor with eddy currents, for at least one area of the strip, comprising the steps of:

  • measuring a quantity representative of the thickness of the coating layer; and

    determining the thickness of the coating layer for the area from the quantity measured and from at least one calibration value,wherein the measuring step is conducted with an eddy current sensor and comprises the steps of;

    measuring a complex impedance of a coil facing the running strip for a low excitation frequency and a high excitation frequency; and

    elaborating a quantity representative of the thickness of the coating layer from said complex impedance measurements.

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