Patent ID: 11940272
Assignee: ABB SCHWEIZ AG
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 15:
16. A non-transitory computer readable storage medium comprising instructions stored therein for causing a controller of a PEC system to perform a method of determining a thickness of an object, the PEC including a transmitter configured to generate a changing electromagnetic field which induces eddy currents in an object of an electrically conductive material arranged within the electromagnetic field, the transmitter having a switching device and a transmitter coil configured to be connected to a voltage source, the switching device being arranged for switching a current generated by the voltage source through the transmitter coil, wherein the transmitter coil includes a plurality of parallel electrically conductive coil layers, connected in parallel to each other, with a respective damping resistor connected across each of the coil layers, each of the coil layers being connected in series with a respective diode, and a receiver configured to detect a changing electromagnetic field generated by the eddy currents, the receiver having an electrically conductive receiver coil, a Receiver Channel, RC, and an Over-Voltage Protection circuit, OVP, connected between the receiver coil and the RC,
wherein the method includes the steps:
by means of the transmitter, inducing first eddy currents in the object;
by means of the receiver, as a function of time, measuring a first voltage having a first polarity in the RC, wherein the first voltage is induced in the receiver coil by a changing electromagnetic field generated by first eddy currents; and
based on the measurement of the first voltage, determining the thickness of the object.