METHOD AND APPARATUS FOR DIAGNOSING UNDERGROUND PIPELINE

摘要

PURPOSE:To improve the pipeline diagnosing speed and accuracy, by combining the detection of corrosion and deficiency on the outer wall of a pipeline by the ultrasonic thickness measurement and the detection of deficiency and corrosion on the inner wall thereof by the eddy current measurement. CONSTITUTION:A rotary unit 15 and a driver 16 are self-driven by the driver 6 and moves through a pipeline 3 to be set at a measuring point. An ultrasonic sensor 22 and an eddy current sensor 23 are driven with an ultrasonic wave transmitter/receiver 17 and an eddy current transmitter/receiver 18 and resulting ultrasonic thickness signal and eddy current signal are fed to the respective transmitter/receivers 17 and 18. The ultrasonic thickness signal is fed to an ultrasonic signal processing section to determine thickness and the minimum thickness is memorized. The eddy current signal is fed to an ultrasonic signal processing section to determine corrosion and deficiency at the measuring point. This unit moves from measuring point to point to repeat the measurement. The results obtained are processed with an arithmetic section and plotted two- dimensionally to determine the area and position of corrosion and the degree and position of cracking, which are displayed in two dimensions.