抄録
Experiments comparing the measured value of ultrasonic thickness measurements and mechanical measurements on rough corroded materials without flattening the test surface were carried out. An average measurement error of from +0.6mm to +2.2mm was found in the ultrasonic measurements. To address this problem, an error correction method using surface echo duration was proposed. A 2.25MHz broadband type transducer was suitable for the measurement and the proposed method can also be applied to a painted test surface.
