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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/197527
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- The effect of size on the quantitative estimation of defect depth in steel structures using lock-in thermography
- Wallbrink, C.; Wade, S. A.; Jones, R.
- An investigation into the effect of size on the quantitative estimation of defect depth in a steel specimen has been undertaken using lock-in thermography. Phase contrast measurements over circular defects of varying diameter and depth are presented for a range of excitation frequencies. It was found that the diameter of a defect had an appreciable effect on the observed phase angle which consequently has significant implications with regard to estimating defect depth. Phase contrast measurements for a range of defects in a 10 mm steel specimen indicate that an excitation frequency of 0.02 Hz is the optimal frequency for defect detection. Results obtained with an excitation frequency of 0.02 Hz are used to discuss the limitations of determining the size and depth of defects. A finite element analysis was found to have good correlation with experimental data and thus demonstrates potential in providing improved estimates of defect depth.
- Publication type
- Journal article
- Journal of Applied Physics, Vol. 101, no. 10 (May 2007), article no. 104907
- Publication year
- FOR Code(s)
- 01 Mathematical Sciences; 02 Physical Sciences; 09 Engineering
- Defect depth; Lock-in thermography; Size; Steel
- American Institute of Physics
- Publisher URL
- Copyright © 2007 American Institute of Physics. Published version of this paper reproduced here with the kind permission of the publisher.
- Additional information
- The authors acknowledge support from the Commonwealth Research Centre for Integrated Engineering Asset Management (CIEAM).
- Full text
- Peer reviewed