METHOD AND DEVICE FOR MEASURING THE THICKNESS OF A COATING LAYER ON A RUNNING STRIP
First Claim
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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Accused Products
Abstract
A method and device for measuring the thickness of a coating material layer of a running strip according to which, by means of an eddy current sensor for at least one area of the strip, a quantity is measured, representative of the thickness of the coating layer and the thickness of the coating layer is determined from the measured quantity and from at least one calibration value. The measurement made with an eddy current sensor comprises the measurement of the complex impedance of a coil facing the running strip for a low excitation frequency and a high excitation frequency and the elaboration of a quantity representative of the thickness of the coating layer from said complex impedance measurements. A device for applying the method and a coating installation equipped with the device.
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Citations
19 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18, 19)
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15. A device continuously measuring the thickness of a coating layer on a running strip, comprising:
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a plurality of eddy current sensors arranged in at least one line on a supporting beam (150), a device controlling the eddy current sensors connected to at least one following device following the progression of the strip, an automatic controller comprising; detector detecting the lateral position of the strip relatively to the plurality of eddy current sensors, and an X fluorescence thickness gauge, and a computer controlling and managing the measurements connected to the device controlling the sensors and to the automatic controller. - View Dependent Claims (16, 17)
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Specification