Journal
NDT & E INTERNATIONAL
Volume 44, Issue 7, Pages 589-596Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2011.06.001
Keywords
Thermography; Scanning laser source
Funding
- Engineering and Physical Sciences Research Council, UK
- Rolls-Royce plc
- RWE npower
- National Nuclear Laboratories as a UK Research Centre in NDE (RCNDE)
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Surface breaking defects are detected using a scanning laser source to deposit heat into a sample surface. Any lateral flow of heat is disturbed by such a defect, with a change in thermal spot shape being detected by an infrared camera. An apparent increase in temperature as the laser passes over a defect is due to a localised change in emissivity, allowing defects to be distinguished from surface markings. Defects have been detected in both stainless steel and aluminium. (C) 2011 Elsevier Ltd. All rights reserved.
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