Parabola detection using matched filtering for ultrasound B-scans

Area of Science:

• Non-destructive testing
• Ultrasonic testing
• Signal processing

Background:

• Time of Flight Diffraction (ToFD) is an ultrasonic technique for material inspection.
• ToFD generates B-scans that display parabolic signatures from point-like scatterers.
• Manual analysis of these B-scans is time-consuming and requires specialized expertise.

Purpose of the Study:

• To develop an automated method for detecting point-like scatterers in ToFD B-scans.
• To improve the efficiency and accuracy of ultrasonic defect analysis.
• To reduce the reliance on manual interpretation of ToFD data.

Main Methods:

• Implementation of a parabola matched filter algorithm.
• Application of the filter to ToFD B-scan data.
• Noise reduction and signal peak enhancement techniques.

Main Results:

• The parabola matched filter effectively transforms parabolic features into distinct peaks.
• Significant noise reduction was observed in the processed B-scans.
• The method simplifies the identification of point-like scatterers.

Conclusions:

• The developed parabola matched filter offers a computationally efficient solution for ToFD data analysis.
• This technique enhances the detectability of flaws and reduces inspection time.
• Automated analysis of ToFD B-scans is feasible and beneficial for non-destructive evaluation.