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.
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