Istituto di Scienza e Tecnologie dell'Informazione     
Bramanti M. A nondestructive diagnostic method based on swept-frequency ultrasound transmission - reflection measurements. In: IEEE Transactions on Instrumentation and measurement, vol. 41 (4) pp. 490 - 494. IEEE, 1992.
Abstract-A particular nondestructive diagnostic technique is proposed to measure depth and thickness of unwanted inclusions inside laminate-type materials (gaps, delaminations, cracks, for example). The method is based on the frequency domain analysis of transmission and reflection coefficient measured on the material under test when it is irradiated by a CW ultrasound beam whose frequency varies over a suitable frequency range. By measuring the frequency distance between two adjacent minima in the attenuation and reflection coefficients the thickness and depth of the inclusion can be obtained. A practical implementation of the technique is suggested and the first experimental results obtained by a laboratory setup are reported.
Subject Ultrasound

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