Non-contact position tracking using phase correlation of sample images for NDT applications
Abstract:Non-destructive testing methods are used in an increasing number of applications, some of which require precise knowledge of the relative position between transducer and surface. Conventionally, this has been determined using a contact method such as a linear/rotary encoder. An alternative is demonstrated here, using a digital camera and the phase correlation technique. Linear sample movement has been determined to sub-pixel precision, confirmed manually as a median accuracy of 0.01 mm of linear movement (0.06 of a pixel) in this case, despite uneven illumination and the use of a basic low-resolution camera.
Document Type: Research Article
Affiliations: Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
Publication date: 2011-04-01
More about this publication?
- Official Journal of The British Institute of Non-Destructive Testing - includes original research and devlopment papers, technical and scientific reviews and case studies in the fields of NDT and CM.
- Information for Authors
- Submit a Paper
- Subscribe to this Title
- Information for Advertisers
- Terms & Conditions
- Ingenta Connect is not responsible for the content or availability of external websites