Improved corner detection by ultrasonic testing using phase analysis

Patrik Broberg

doi:10.1016/j.ultras.2012.10.015

Improved corner detection by ultrasonic testing using phase analysis

2013-02-01

7

PRE

AI

DOI：10.1016/j.ultras.2012.10.015

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In ultrasonic testing, corners are used for sensitivity calibration in the form of notches, for measuring the sound velocity in the material, and as known reference points during testing. A 90 degrees corner will always reflect incoming waves in the opposite direction due to a double reflection and therefore give a strong echo. This article presents a method for separating the echo from a corner from other echoes and more accurately find the position of the corner. The method is based on analysing the phase of the reflected signal. The proposed method was tested on a steel calibration block and the width of the indication was reduced by up to 50% compared to the amplitude signal. This results in a more accurate positioning of the corner. Using the phase instead of the amplitude will also improve the reliability, since reflections other than from corners will disappear. (C) 2012 Elsevier B.V. All rights reserved.

Keyword:

Phase

Ultrasound

Non-destructive testing

Corner

Calibration

Improved corner detection by ultrasonic testing using phase analysis

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