High-temperature integrated and flexible ultrasonic transducers for nondestructive testing

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DOIResolve DOI: http://doi.org/10.1016/j.ndteint.2008.11.003
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Journal titleNDT&E International
Pages157161; # of pages: 5
SubjectIntegrated ultrasonic transducers; Flexible ultrasonic transducers; NDT; Stainless steel; Thin film; Delay line; Lithium niobates; PZT; Ceramic coating; Thick film; Piezoelectric ceramics; Sol gel process; Ultrasonic transducer; High temperature; Pulse echo method; Dimensional control; Thickness measurement; Acoustic measurement; Ultrasonic control; Non destructive test; Metrology; Couche mince; Ligne retard; Niobate de lithium; PZT; Revêtement céramique; Couche épaisse; Céramique piézoélectrique; Procédé sol gel; Transducteur ultrason; Haute température; Méthode écho impulsion; Contrôle dimensionnel; Mesure épaisseur; Mesure acoustique; Essai ultrason; Essai non destructif; Métrologie
AbstractIntegrated ultrasonic transducers (IUTs) and flexible ultrasonic transducers (FUTs) are presented for nondestructive testing at high temperatures. These transducers are made of sol-gel-sprayed piezoelectric thick (>40 µm) ceramic films. The ceramic materials are lead-zirconate-titanate, bismuth titanate and lithium niobate which are for thickness measurements up to 150, 400 and 800°C, respectively. The IUT can also be deposited onto one end of a long ultrasonic delay line to perform nondestructive testing at the other end at even higher temperatures. FUTs made of bismuth titanate films onto thin stainless steel foils are also used for thickness measurements at 300°C with a high-temperature couplant sandwiched between the FUT and a steel substrate. All experiments at high temperatures were performed in pulse-echo mode and ultrasonic echoes with signal-to-noise ratios above 20 dB were obtained. The center operation frequencies of both IUTs and FUTs range from 4.4 to 10.7 MHz.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada (NRC-CNRC)
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Peer reviewedYes
NRC number51057
NPARC number11213131
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Record identifierbf1da5c3-46d5-45b6-b704-6c1774f31f85
Record created2009-10-03
Record modified2016-05-09
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