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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
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Official URL: http://doi.org/10.1784/insi.2016.58.11.596
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 > 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: |
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| Date of first compliant deposit: | 7 February 2017 | ||||||
| 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 |
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