Share Email Print
cover

Proceedings Paper

Optimisation of sonic thermographic inspection
Author(s): Kelly A. Tsoi; Khalid Yousif; Nik Rajic; Ian Powlesland
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

A versatile and broad-field technique, sonic thermography uses high intensity acoustic waves to induce frictional heating at defect locations and the thermal signature is then detected using IR imaging. Sonic thermography has the potential to be used as a quantitative technique for difficult inspection problems. One example is the inspection of interference fit fasteners. In the case of poorly fitted interference fasteners, the acoustic waves induce relative motion between the fastener and host, causing frictional heating which can then be detected. The preliminary results of an inspection of interference fit levels in fastened metallic plates, reminiscent of the F-111C wing skin, are discussed. By improving the repeatability of the acoustic energy transfer, the heat detected using the IR thermographic system can be correlated to the interference fit levels of the fasteners. The results provide encouragement for the development of a quantitative assessment capability, however one of the remaining critical issues, which has hindered the use of sonic thermography as a quantitative technique, is the poor repeatability of acoustic excitations. This paper will also report on an experimental study which investigates this repeatability issue, in particular the role of the interface material used between the horn tip and the structure to enhance energy transfer.

Paper Details

Date Published: 8 April 2009
PDF: 10 pages
Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 729411 (8 April 2009); doi: 10.1117/12.822728
Show Author Affiliations
Kelly A. Tsoi, Defence Science and Technology Organisation (Australia)
Khalid Yousif, Defence Science and Technology Organisation (Australia)
Nik Rajic, Defence Science and Technology Organisation (Australia)
Ian Powlesland, Defence Science and Technology Organisation (Australia)


Published in SPIE Proceedings Vol. 7294:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009
H. Felix Wu; Aaron A. Diaz; Peter J. Shull; Dietmar W. Vogel, Editor(s)

© SPIE. Terms of Use
Back to Top