High-temperature-immersion ultrasonic probe without delay line using PbTiO3/Pb(Zr,Ti)O3ultrasonic transducer

The behavior of a high-temperature-immersion ultrasonic probe without a delay line using a PbTiO3/Pb(Zr,Ti)O3 (PT/PZT) ultrasonic transducer was investigated empirically. A ∼100-µm-thick PT/PZT film was fabricated on a 200-µm-thick stainless steel substrate. After PT/PZT film fabrication, the substrate was bonded to a stainless steel pipe using a high-temperature waterproof adhesive material. The probe was tested in a water bath from room temperature to 100 °C for system verification. During three thermal cycles, the ultrasonic echoes had a high signal-to-noise ratio (SNR) and reasonable repeatability. After that, the same probe was verified by testing it in the silicone oil from room temperature to 200 °C. The test was also repeated three times and the probe successfully demonstrated high-temperature durability, a high SNR, and repeatability throughout the experiments.