Bestimmung einer Dicke eines Werkstücks mit Inhomogenem Widerstand

Details

Veröffentlichungs-Nr.

EP4715318

Anmeldetag

23. September 2024

Veröffentlichung

25. März 2026

Rechtsraum

EP

IPC

G01B7/06, B21B38/04, B21B37/16

Abstract

A computer-implemented method for determining a thickness of a work item (104) comprising: controlling (S102) a magnetic field generating device (106) to apply a magnetic field pulse to the work item (104), acquiring (S104) a data signal (S) reflecting a time dependence of an eddy current decay in the work item caused by the applied magnetic field pulse, the data signal comprising multiple consecutive data samples, calculating (S106) a first thickness (tj0) of the work item based on a set of data samples in the data signal, calculating (S108) a first resistivity (res(Rs)) of the work item based on a first set (Rs) of data samples, calculating (S110) a second resistivity (res(tj2)) of the work item based on a second set (tj2) of data samples in the data signal including data samples subsequent to at least one sample in the first set (Rs) of data samples, determining (S112) a resistivity gradient compensation factor based on a difference between the second resistivity and the first resistivity, calculating (S114) a resistivity gradient compensated thickness (tj) of the work item based on the first thickness (tj0), a relation (f) between the first thickness and the first resistivity, and the resistivity gradient compensation factor, and providing (S116) an output of the resistivity gradient compensated thickness (tj) of the work item.

Anmelder

Firma

ABB SCHWEIZ AG

Land

🇨🇭 Schweiz