A noise variance model of a differential eddy current coil used for coating thickness determination

Martin Koll; Daniel Wöckinger; Markus Peer; Gerd Bramerdorfer; Stefan Schuster; Stefan Scheiblhofer; Norbert Gstöttenbauer; Johann Reisinger

A noise variance model of a differential eddy current coil used for coating thickness determination

Martin Koll, Daniel Wöckinger, Markus Peer, Gerd Bramerdorfer, Stefan Schuster, Stefan Scheiblhofer, Norbert Gstöttenbauer, Johann Reisinger

Institute of Electrical Drives and Power Electronics

Research output: Chapter in Book/Report/Conference proceeding › Conference proceedings › peer-review

Abstract

Real-world measurements are always affected by noise, e.g., thermal noise. For accurate parameter estimation results based
on measured data, e.g., for sensitive coating thickness determination, the minimization of noise influences is essential. This
paper focuses on modeling the noise behavior of an eddy current measurement system for coated steel sheets, involving the
measurement of the excitation current and the induced pick-up voltage, followed by FFT analysis and fundamental wave
evaluation. From this, sheet metal parameters can be determined. The presented model describes the propagation of noise
from a noisy sinusoidal excitation current to the induced voltage in the pick-up coils. This noise model is successfully verified
by means of measurements and thus validated. Such a model is necessary for the development of a maximum likelihood
estimator for coating thickness. Furthermore, it can serve as a basis for the optimal design of an eddy current sensor system.

Original language	English
Title of host publication	SMM Turin, 08.-11.09.2025
Publication status	Accepted/In press - Sept 2025

Fields of science

202027 Mechatronics
202011 Electrical machines
202 Electrical Engineering, Electronics, Information Engineering
202025 Power electronics
202009 Electrical drive engineering

JKU Focus areas

Sustainable Development: Responsible Technologies and Management
Digital Transformation

Cite this

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title = "A noise variance model of a differential eddy current coil used for coating thickness determination",

abstract = "Real-world measurements are always affected by noise, e.g., thermal noise. For accurate parameter estimation results based on measured data, e.g., for sensitive coating thickness determination, the minimization of noise influences is essential. This paper focuses on modeling the noise behavior of an eddy current measurement system for coated steel sheets, involving the measurement of the excitation current and the induced pick-up voltage, followed by FFT analysis and fundamental wave evaluation. From this, sheet metal parameters can be determined. The presented model describes the propagation of noise from a noisy sinusoidal excitation current to the induced voltage in the pick-up coils. This noise model is successfully verified by means of measurements and thus validated. Such a model is necessary for the development of a maximum likelihood estimator for coating thickness. Furthermore, it can serve as a basis for the optimal design of an eddy current sensor system.",

author = "Martin Koll and Daniel W{\"o}ckinger and Markus Peer and Gerd Bramerdorfer and Stefan Schuster and Stefan Scheiblhofer and Norbert Gst{\"o}ttenbauer and Johann Reisinger",

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T1 - A noise variance model of a differential eddy current coil used for coating thickness determination

AU - Koll, Martin

AU - Wöckinger, Daniel

AU - Peer, Markus

AU - Bramerdorfer, Gerd

AU - Schuster, Stefan

AU - Scheiblhofer, Stefan

AU - Gstöttenbauer, Norbert

AU - Reisinger, Johann

PY - 2025/9

Y1 - 2025/9

N2 - Real-world measurements are always affected by noise, e.g., thermal noise. For accurate parameter estimation results based on measured data, e.g., for sensitive coating thickness determination, the minimization of noise influences is essential. This paper focuses on modeling the noise behavior of an eddy current measurement system for coated steel sheets, involving the measurement of the excitation current and the induced pick-up voltage, followed by FFT analysis and fundamental wave evaluation. From this, sheet metal parameters can be determined. The presented model describes the propagation of noise from a noisy sinusoidal excitation current to the induced voltage in the pick-up coils. This noise model is successfully verified by means of measurements and thus validated. Such a model is necessary for the development of a maximum likelihood estimator for coating thickness. Furthermore, it can serve as a basis for the optimal design of an eddy current sensor system.

AB - Real-world measurements are always affected by noise, e.g., thermal noise. For accurate parameter estimation results based on measured data, e.g., for sensitive coating thickness determination, the minimization of noise influences is essential. This paper focuses on modeling the noise behavior of an eddy current measurement system for coated steel sheets, involving the measurement of the excitation current and the induced pick-up voltage, followed by FFT analysis and fundamental wave evaluation. From this, sheet metal parameters can be determined. The presented model describes the propagation of noise from a noisy sinusoidal excitation current to the induced voltage in the pick-up coils. This noise model is successfully verified by means of measurements and thus validated. Such a model is necessary for the development of a maximum likelihood estimator for coating thickness. Furthermore, it can serve as a basis for the optimal design of an eddy current sensor system.

M3 - Conference proceedings

BT - SMM Turin, 08.-11.09.2025

ER -