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Proceedings Paper

Thickness characterization of refractory linings by low-frequency ultrasonic waves
Author(s): Antonino S. Fiorillo; Nicola Lamberti; N. Pappalardo
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Paper Abstract

In this work we describe a method to measure the thickness of refractory lining of cigar shaped cars for the transportation of melted cast-iron, based on the pulse-echo technique at very low frequency. Following this approach two main problems arise related to the small dimensions of the transducers in respect to the ultrasonic wavelength: a poor directivity of the bulk wave and the presence of a strong surface wave. An improvement of the S/N ratio at the receiver input is obtained by using two unimodal transducers, one transmitter and one receiver, while the time discrimination between the bulk and the surface waves is obtained by taking advantage of the different wave velocities and by properly choosing the distance between the two transducers.

Paper Details

Date Published: 5 November 1992
PDF: 8 pages
Proc. SPIE 1733, New Developments in Ultrasonic Transducers and Transducer Systems, (5 November 1992); doi: 10.1117/12.130609
Show Author Affiliations
Antonino S. Fiorillo, Univ. di Salerno (Italy)
Nicola Lamberti, Univ. di Salerno (Italy)
N. Pappalardo, Univ. di Salerno (Italy)

Published in SPIE Proceedings Vol. 1733:
New Developments in Ultrasonic Transducers and Transducer Systems
Frederick L. Lizzi, Editor(s)

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