High temperature thickness measurements using a bismuth titanate piezoelectric transducer Available to Purchase

Bismuth titanate Bi₄Ti₃O₁₂ was prepared through a sol-gel process, characterised and built as a high temperature ultrasound transducer. Platinum electrodes and wires were used throughout for high temperature stability and Pyrogel 100 used as couplant. The piezoelectric coefficient was found to be stable to 550C. Repeatable thickness measurements were made up to 250°C on aluminium and steel test samples using a pulse-echo technique and the efficiency of the transducer studied under thermal cycling.