US 11,940,272 B2
Pulsed eddy current system
Jarl Sobel, Bagarmossen (SE); and Martin Zlatanski, Küsnacht (CH)
Assigned to ABB Schweiz AG, Baden (CH)
Appl. No. 18/255,993
Filed by ABB Schweiz AG, Baden (CH)
PCT Filed Sep. 21, 2021, PCT No. PCT/EP2021/075906
§ 371(c)(1), (2) Date Jun. 5, 2023,
PCT Pub. No. WO2022/122207, PCT Pub. Date Jun. 16, 2022.
Claims priority of application No. 20213460 (EP), filed on Dec. 11, 2020.
Prior Publication US 2024/0044635 A1, Feb. 8, 2024
Int. Cl. G01B 7/06 (2006.01)
CPC G01B 7/10 (2013.01) 16 Claims
OG exemplary drawing
 
3. A PEC system comprising:
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.