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High-frequency eddy current measurements using sensor-mounted electronics

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Hughes, F., Day, R., Tung, N. and Dixon, Steve M. (2016) High-frequency eddy current measurements using sensor-mounted electronics. Insight- Non-Destructive Testing & Condition Monitoring, 58 (11). pp. 596-600. doi:10.1784/insi.2016.58.11.596 ISSN 1354-2575.

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Official URL: http://doi.org/10.1784/insi.2016.58.11.596

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Abstract

Eddy current techniques are used widely for the detection of surface-breaking cracks in metal samples and the detection of such defects in metals with low electrical conductivity is challenging. To achieve good sensitivity to small surface cracks, the electromagnetic skin depth of the eddy current needs to be small, which often means operating at MHz frequencies. One of the major challenges in high-frequency eddy current testing is that the capacitance of the cable between the instrument electronics and the sensor head becomes significant in the MHz range, making the system unstable and introducing noise into the system as the cable moves and interacts electrically with objects close to it. There are significant benefits to locating the electrical circuitry directly behind the eddy current sensor coils, reducing issues with cable-induced electrical noise, enabling the detection of smaller defects at earlier stages of growth. Materials such as nickel-based super-alloys, titanium, austenitic steel and carbon fibre composites are often used in safety-critical applications, where the ability to detect surface cracks at the earliest possible stage is vital. Examples are presented that show the detection of small defects in a range of challenging materials at eddy current frequencies up to more than 15 MHz.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Eddy currents (Electric), Materials -- Testing, Electric testing
Journal or Publication Title: Insight- Non-Destructive Testing & Condition Monitoring
Publisher: British Institute of Non-Destructive Testing
ISSN: 1354-2575
Official Date: November 2016
Dates:
DateEvent
November 2016Published
7 September 2016Accepted
Volume: 58
Number: 11
Number of Pages: 5
Page Range: pp. 596-600
DOI: 10.1784/insi.2016.58.11.596
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 7 February 2017
Date of first compliant Open Access: 8 February 2017

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