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Noncontact Air Coupled Technique of Ultrasonic Testing

The noncontact air coupled technique offers the distinct advantage of the elimination of water contamination of the test piece, the elimination of water handling and purification systems (pumps, tanks or collection basins, filters and more), and the elimination of contaminated water disposal issues. For these reasons, it is particularly well-suited to the testing of engineered materials that may be damaged by water incursion or will be subject to additional bonding procedures subsequent to testing, such as honeycomb core materials, foam core materials, ceramic matrix materials, graphite epoxy lay-ups, metal laminates, and many other engineered materials.


The American Society for Nondestructive Testing, Nondestructive Testing Handbook, Vol. 7: Ultrasonic Testing, ASNT, 1991. Hsu, D. K., V. Kommareddy, D. J. Barnard and J. J. Peters, “Aerospace NDT Using Piezoceramic Air-coupled Transducers,” 16th World Conference on NDT Proceedings, 30 August – 3 September 2004, Montreal, Canada. Rao, M. V., R. Samuel, A. Ananthan , S . Dasgupta and P . S . Nair, “NDE Studies on Spacecraft Structural Components Using Air Coupled Ultrasonic and Thermography Techniques,” Proceedings of the National Seminar on Non-Destructive Evaluation, 7 – 9 December 2006, Hyderabad, India. Strycek, J. O. and H. Loertscher, “Ultrasonic Air-coupled Inspection of Advanced Materials,” 44th International SAMPE Symposium and Exhibition, Vol. 44, 23 – 27 May 1999, pp. 102–112.

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