Inverse Wave Field Extrapolation (IWEX) is an emerging ultrasonic testing technique that shows great potential in both defect detection and characterization, combined with a simplified presentation of inspection due to an imaging approach. This technique is currently being implemented in the Applus RTD IWEX 3D Imager.
IWEX is a new ultrasonic testing
method whose development was initiated by Applus+ RTD in 2004. The result of this emerging techniques is an actual image of the inspected volume, rather than a plot of the collected signals. The IWEX methodology allows for data visualization in both two and three dimensions.
The major advantages of IWEX are:
- Straightforward interpretation that is less dependent on operator skills and calibration blocks
- Reliable detection and accurate sizing, less dependent on defect orientation than existing UT techniques
- IWEX image is directly linked to defect properties
- Improvements have been introduced that allow for imaging of defects in the near surface, in a weld with cap and root or perpendicular to the surface
- Defects with various orientations are imaged by combining both direct insonification and indirect measurements via the back wall
- Better and easier means of defect detection and characterization will ultimately lead to less repair and maintenance costs