Use of sputtered zinc oxide film on aluminium foil substrate to produce a flexible and low profile ultrasonic transducer

Ruozhou Hou, Yong Qing Fu, David Hutson, Chao Zhao, Esteban Gimenez, Katherine J Kirk

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
185 Downloads (Pure)

Abstract

A flexible and low profile ultrasonic transducer was fabricated for non-destructive testing (NDT) applications by DC sputtering of 3μm thick, c-axis oriented, ZnO film on 50μm aluminium foil. Due to the thin foil-based construction, the transducer can be applied to curved objects and used in sites of restricted accessibility. The device has been used to demonstrate detection of simulated defects in a 45mm diameter steel pipe, and for thickness measurement on a 3.1mm thick flat carbon steel plate. Centre frequency measured on the flat plate was 24-29MHz, with -6dB bandwidth 4-7MHz. The pulse duration depended on the couplant, at best 3 cycles or 0.12μs using SONO Ultragel or epoxy couplant. Transducer performance was found to be comparable to a commercial 10MHz piezoelectric ultrasonic transducer.

Original languageEnglish
Pages (from-to)54-60
Number of pages7
JournalUltrasonics
Volume68
Early online date13 Feb 2016
DOIs
Publication statusPublished - May 2016

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