The high performance imaging capability of ultrasonic phased arrays has encouraged their recent widespread adoption for inspecting aircraft components. A critical inspection on aging aircraft is the detection of radial cracks around fasteners. In a current application, the array is mechanically scanned over the fasteners and volumetric RF waveforms data, comprising ultrasonic frames of 45 deg shear beams, are recorded for each position of the array. Multiple passes with the array skewed at-20 deg, 0 deg and 20 deg are required to find cracks at the specified orientations. This paper confirms that multi-skew angle inspection is necessary because the magnitude of reflection from a crack decreases with inspection angle. We then go on to report an electronic beam skew technique that can be applied during post-processing, enabling single pass data acquisition for enhanced second layer crack detection.
Further developments in ultrasonic phased array inspection of aging aircraft
Zukünftige Entwicklungen bei der Ultraschallprüfung gealterter Flugzeuge mit Gruppenstrahlern
2007
14 Seiten, 16 Bilder, 1 Tabelle, 5 Quellen
Conference paper
Storage medium
English
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