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In pipe systems for water, gas and electric power transports and also for communication lines, it is greatly important to detect abnormalities in the pipes as accurately and promptly as possible, from the viewpoint of realizing a rapid restoration of the life lines. The paper proposes a method which measures the location, thickness and cross-sectional area of the abnormal objects in pipes based on the reflected wave. When transmitting a sonic wave into the pipes, many reflections are usually generated from not only the abnormal objects but also the pipe ends and the branch points in the pipes. To make the problem much worse, they are strongly superposed to each other. The paper thus proposes to apply a separation technique based on the reflected wave model and enables the measurement of the location, thickness and cross-sectional area of the abnormal objects, despite an exact information on the shape and length of the pipe system.

Measurement of Location, Thickness and Cross-Sectional Area of Abnormal Objects in Pipes