Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

# Measurement of Radius of a Metallic Ball Using Eddy Current Testing Based on Peak Frequency Difference Feature

Version 1 : Received: 8 July 2021 / Approved: 9 July 2021 / Online: 9 July 2021 (13:13:23 CEST)
Version 2 : Received: 13 July 2021 / Approved: 14 July 2021 / Online: 14 July 2021 (14:10:02 CEST)

How to cite: Hu, G.; Huang, R.; Lu, M.; Zhou, L.; Yin, W. Measurement of Radius of a Metallic Ball Using Eddy Current Testing Based on Peak Frequency Difference Feature. Preprints 2021, 2021070220 (doi: 10.20944/preprints202107.0220.v2). Hu, G.; Huang, R.; Lu, M.; Zhou, L.; Yin, W. Measurement of Radius of a Metallic Ball Using Eddy Current Testing Based on Peak Frequency Difference Feature. Preprints 2021, 2021070220 (doi: 10.20944/preprints202107.0220.v2).

## Abstract

This paper proposes a linear eddy-current feature to determine the radius of a metallic ball in a non-contact manner. An electromagnetic eddy-current sensor with two coils is placed co-axially to the metal ball during measurement. It is well known that the distance between the sensor and test piece (i.e. lift-off) affects eddy-current signals. In this paper, it is found that the peak frequency feature of inductance spectrum is linear to the lift-off spacing between the centre of coil and ball. Besides, the slope of peak frequencies versus lift-offs is linked to the radius of ball. The radius of metallic balls is retrieved from the experimental and embedded analytical result of the slope. Measurements have been carried out on 6 metallic balls with different radii. The radius of the metallic ball can be retrieved with an error of less than 2 %.

## Keywords

Eddy current sensor; lift-off variation; radius measurement; peak frequency feature; multi-frequency testing

## Subject

ENGINEERING, Automotive Engineering

Comment 1
Commenter: Mingyang Lu
Commenter's Conflict of Interests: Author
Comment: Correction of affiliate.
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