Abstract
This paper describesa number ofmethods for calculating the point of incidence at a planarrefractive interface between dual-layered media for ultrasonic applications in the field of non-destructive testing. It is shown how Snell's law may be expressed as a quartic polynomial, and solved using analytical or numerical techniques to find the point of incidence at the refractive interface. An array transducer mounted onto a Perspex wedge is used to generate ultrasonic imagery of a double 'v' butt weld in a low carbon steel plate, using the Full Matrix Capture technique. Curve-fitting algorithms are also presented that allowautomated focussingthrough the wedge-plate interface. Finally, a description is given on how algorithms may be adapted to allow auto-focussing through dual media with a non-planar interface. (C) 2011 Elsevier Ltd. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 43-50 |
| Number of pages | 8 |
| Journal | NDT & E International |
| Volume | 47 |
| DOIs | |
| Publication status | Published - 1 Apr 2012 |
Keywords
- Full Matrix Capture
- Signal processing
- Non-destructive evaluation
- Snell's law
- Ultrasonic imaging