公开(公告)号：US20240264120A1

公开(公告)日：2024-08-08

申请号：US18575897

申请日：2022-06-28

Applicant: ABB Schweiz AG

Inventor： Martin Zlatanski ,  Parham Davami ,  Jarl Sobel ,  Thomas Wiik ,  Jan Nilsson

IPC: G01N27/90 ,  G01B7/06 ,  G01N27/02

CPC classification number: G01N27/9006 ,  G01B7/10 ,  G01N27/025 ,  G01N27/028

Abstract: A receiver for a Pulsed Eddy Current (PEC) system configured to detect a changing electromagnetic field generated by eddy currents induced in an object of an electrically conductive material. The receiver includes an electrically conductive receiver coil, a high-voltage receiver channel, a low-voltage receiver channel, and an over-voltage protection connected between the receiver coil and the LVRC. The OVP includes a bias circuit B, a diode D connected between the receiver coil and the bias circuit, and a capacitor C connected between the bias circuit and the LVRC.

公开(公告)号：US11892285B2

公开(公告)日：2024-02-06

申请号：US17652296

申请日：2022-02-24

Applicant: ABB Schweiz AG

Inventor： Sten Linder ,  Jarl Sobel ,  Anders Eidenvall ,  Martin Haldin ,  Aleksander Dzieciol

IPC: G01B7/06

CPC classification number: G01B7/105

Abstract: A method of non-contact measurement of a thickness (d) of an object of an electrically conductive material by means of a Pulsed Eddy Current, PEC, system including a transmitter coil and a receiver coil. The method includes, after having turned off a current in the transmitter coil, at the receiver coil, measuring a voltage induced by the decaying magnetic field at a first time point, a second time point, and a third time point. The method also includes calculating a total magnetic flux which is generated by the eddy currents in the object at the first time point and picked up by the receiver coil, by comparing the measured flux at the first time point with a predetermined total flux picked up by the receiver coil when no object is present. The method also includes normalizing measured magnetic flux resulting from the eddy currents and picked up by the receiver coil, using the calculated total magnetic flux as a normalization factor such that the normalized eddy current flux is independent of a distance between the object and the transmitter and receiver coils. The method also including, based on the measurements at the first, second and third time points, determining the thickness and the resistivity of the object.

公开(公告)号：US20210325167A1

公开(公告)日：2021-10-21

申请号：US17198348

申请日：2021-03-11

Applicant: ABB Schweiz AG

Inventor： Jarl Sobel ,  Martin Haldin

IPC: G01B7/06 ,  B21B38/04

Abstract: A method for determining a present thickness of a work item while being processed in a rolling mill, the method including: acquiring a data signal reflecting a time dependence of an eddy current decay in the work item caused by an applied pulsed magnetic field, determining a thickness parameter value based on the acquired signal, the thickness parameter value being determined from samples in the data signal, the thickness parameter value being dependent on a ratio between a thickness of the work item and a resistivity of the work item, computing a ratio between a reference thickness value of the work item and the thickness parameter value to thereby provide an instantaneous resistivity value, determining a mean resistivity value based on the instantaneous resistivity value, and providing an output signal based on the mean resistivity of the work item and the thickness parameter value, the output signal being indicative of the determined present thickness of the work item.

公开(公告)号：US11940272B2

公开(公告)日：2024-03-26

申请号：US18255993

申请日：2021-09-21

Applicant: ABB Schweiz AG

Inventor： Jarl Sobel ,  Martin Zlatanski

IPC: G01B7/06

CPC classification number: G01B7/10

Abstract: The present disclosure relates to a transmitter for a Pulsed Eddy Current system, 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 includes a switching device and a transmitter coil configured to be connected to a voltage source. The switching device is arranged for switching a current generated by the voltage source through the transmitter coil. The transmitter coil comprises a plurality of parallel electrically conductive coil layers 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.

公开(公告)号：US20240044635A1

公开(公告)日：2024-02-08

申请号：US18255993

申请日：2021-09-21

Applicant: ABB Schweiz AG

Inventor： Jarl Sobel ,  Martin Zlatanski

IPC: G01B7/06

CPC classification number: G01B7/10

Abstract: The present disclosure relates to a transmitter for a Pulsed Eddy Current system, 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 includes a switching device and a transmitter coil configured to be connected to a voltage source. The switching device is arranged for switching a current generated by the voltage source through the transmitter coil. The transmitter coil comprises a plurality of parallel electrically conductive coil layers 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.

公开(公告)号：US11885615B2

公开(公告)日：2024-01-30

申请号：US17198348

申请日：2021-03-11

Applicant: ABB Schweiz AG

Inventor： Jarl Sobel ,  Martin Haldin

IPC: G01B7/06 ,  B21B38/04

CPC classification number: G01B7/107 ,  B21B38/04

Abstract: A method for determining a present thickness of a work item while being processed in a rolling mill, the method including: acquiring a data signal reflecting a time dependence of an eddy current decay in the work item caused by an applied pulsed magnetic field, determining a thickness parameter value based on the acquired signal, the thickness parameter value being determined from samples in the data signal, the thickness parameter value being dependent on a ratio between a thickness of the work item and a resistivity of the work item, computing a ratio between a reference thickness value of the work item and the thickness parameter value to thereby provide an instantaneous resistivity value, determining a mean resistivity value based on the instantaneous resistivity value, and providing an output signal based on the mean resistivity of the work item and the thickness parameter value, the output signal being indicative of the determined present thickness of the work item.

公开(公告)号：US20220282964A1

公开(公告)日：2022-09-08

申请号：US17652296

申请日：2022-02-24

Applicant: ABB Schweiz AG

Inventor： Sten Linder ,  Jarl Sobel ,  Anders Eidenvall ,  Martin Haldin ,  Aleksander Dzieciol

IPC: G01B7/06

Abstract: A method of non-contact measurement of a thickness (d) of an object of an electrically conductive material by means of a Pulsed Eddy Current, PEC, system including a transmitter coil and a receiver coil. The method includes, after having turned off a current in the transmitter coil, at the receiver coil, measuring a voltage induced by the decaying magnetic field at a first time point, a second time point, and a third time point. The method also includes calculating a total magnetic flux which is generated by the eddy currents in the object at the first time point and picked up by the receiver coil, by comparing the measured flux at the first time point with a predetermined total flux picked up by the receiver coil when no object is present. The method also includes normalizing measured magnetic flux resulting from the eddy currents and picked up by the receiver coil, using the calculated total magnetic flux as a normalization factor such that the normalized eddy current flux is independent of a distance between the object and the transmitter and receiver coils. The method also including, based on the measurements at the first, second and third time points, determining the thickness and the resistivity of the object.