Abstract
Cast iron with inner mortal coat pipe is the most important and popular component in Japanese main water supply system. However these pipes are difficult to monitor the corrosion loss in thickness because of the lack of a nondestructive testing method. For example, the large acoustic attenuation for damaged mortal and cast iron cause the SN ratio in measurement worse. In this study, we have developed the special wideband ultrasonic transducer and also developed the effective high voltage new ultrasonic pulser for the monitoring of the corrosion loss in thickness for aging cast iron with inner mortal coat pipe. Accuracy for this measurement system for thickness sizing and the repeatability of back surface reflection echo were also investigated.
