Thick (50 µm) piezoelectric films have been de-posited directly on top of steel and aluminum substrates as integrated ultrasonic transducer (IUT) receivers to de-tect laser generated ultrasound. The film fabrication is based on a sol-gel spray technique. In this study IUTs intrinsi-cally acting as bulk longitudinal wave receivers use vari-ous mode conversion approaches and serve as longitudinal, shear, symmetric, anti-symmetric and shear horizontal plate wave receivers. Different laser generation conditions such as point and line sources of different sizes are also applied to investigate the capabilities of IUT receivers. Ultrasonic measurements on metal substrates with planar and curved surfaces at temperature up to 400°C using laser generated and IUT ultrasound receiver are demonstrated.
Keywords Integrated ultrasonic transducers ·Laser ultrasound ·High temperature ·Longitudinal and shear waves ·Plate acoustic waves ·Non-destructive testing