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Published on: March 6, 2019
Improved corner detection by ultrasonic testing using phase analysis
Patrik Broberg1, Anna Runnemalm, Mikael Sjödahl
1University West, SE-461 86 Trollhattan, Sweden. patrik.broberg@hv.se
Ultrasonics
|November 21, 2012
Summary
This study introduces a new ultrasonic testing method using signal phase analysis to precisely locate corners. The technique significantly improves accuracy and reliability by distinguishing corner echoes from other signals.
Area of Science:
- Non-destructive testing
- Ultrasonic testing
- Signal processing
Background:
- Corners in ultrasonic testing serve crucial roles in calibration, velocity measurement, and as reference points.
- A 90° corner typically generates a strong echo due to double reflection, aiding in signal detection.
Purpose of the Study:
- To develop a method for accurately separating corner echoes from other signals in ultrasonic testing.
- To enhance the precision of corner positioning using a novel signal analysis technique.
Main Methods:
- The proposed method analyzes the phase of the reflected ultrasonic signal.
- This phase-based approach is applied to distinguish corner reflections from other acoustic signals.
Main Results:
- The width of the indication from corners was reduced by up to 50% compared to traditional amplitude-based methods.
- The phase analysis method demonstrated improved accuracy in corner positioning on a steel calibration block.
Conclusions:
- Analyzing the phase of ultrasonic signals offers a more reliable method for corner detection and positioning.
- This technique enhances the reliability of ultrasonic testing by eliminating non-corner reflections.
