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Sensors 2017, 17(7), 1536; https://doi.org/10.3390/s17071536

A Steel Ball Surface Quality Inspection Method Based on a Circumferential Eddy Current Array Sensor

1
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2
College of Transportation, Shandong University of Science and Technology, Qingdao 266590, China
3
College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao 266590, China
*
Author to whom correspondence should be addressed.
Received: 17 April 2017 / Revised: 14 June 2017 / Accepted: 26 June 2017 / Published: 1 July 2017
(This article belongs to the Section Physical Sensors)
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Abstract

To efficiently inspect surface defects on steel ball bearings, a new method based on a circumferential eddy current array (CECA) sensor was proposed here. The best probe configuration, in terms of the coil quality factor (Q-factor), magnetic field intensity, and induced eddy current density on the surface of a sample steel ball, was determined using 3-, 4-, 5-, and 6-coil probes, for analysis and comparison. The optimal lift-off from the measured steel ball, the number of probe coils, and the frequency of excitation current suitable for steel ball inspection were obtained. Using the resulting CECA sensor to inspect 46,126 steel balls showed a miss rate of ~0.02%. The sensor was inspected for surface defects as small as 0.05 mm in width and 0.1 mm in depth. View Full-Text
Keywords: steel ball; circumferential eddy current array sensor; defects steel ball; circumferential eddy current array sensor; defects
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Zhang, H.; Xie, F.; Cao, M.; Zhong, M. A Steel Ball Surface Quality Inspection Method Based on a Circumferential Eddy Current Array Sensor. Sensors 2017, 17, 1536.

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