caa a22 4500 477080588 CHVBK 20180405111448.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00733822 doi (NATIONALLICENCE)springer-10.1007/BF00733822 The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers [Elektronische Daten] [D. Alleyne, P. Cawley] The development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described. It is shown that the axisymmetricL(0,2) mode at a frequency of about 70 kHz is an attractive mode to use for longdistance propagation. The results show that a ring of piezoelectric length-expander elements can be used to excite theL(0,2) mode and to suppress all the nonaxisymmetric modes. Tests have been carried out both with the piezoelectric elements bonded to the pipe and fabricated into a simple transducer which was clamped against the pipe. The performance of the dry-coupled system was very similar to that of the bonded elements. In pulse echo tests, the noise floor obtained with the dry-coupled system was less than 1% of the amplitude of the propagatingL(0,2) mode. The drycoupled transducers provide a simple, light, readily detachable system for the long-range inspection of pipework. Plenum Publishing Corporation, 1996 Pipework nationallicence corrosion nationallicence Lamb waves nationallicence dry-coupled transducers nationallicence Alleyne D. Department of Mechanical Engineering, Imperial College, SW7 2BX, London, UK aut Cawley P. Department of Mechanical Engineering, Imperial College, SW7 2BX, London, UK aut Journal of Nondestructive Evaluation Kluwer Academic Publishers-Plenum Publishers 15/1(1996-03-01), 11-20 0195-9298 15:1<11 1996 15 10921 https://doi.org/10.1007/BF00733822 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00733822 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alleyne D. Department of Mechanical Engineering, Imperial College, SW7 2BX, London, UK aut NATIONALLICENCE 700 1- Cawley P. Department of Mechanical Engineering, Imperial College, SW7 2BX, London, UK aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Kluwer Academic Publishers-Plenum Publishers 15/1(1996-03-01), 11-20 0195-9298 15:1<11 1996 15 10921 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer