| 摘要 |
PURPOSE: To provide a simple and easy conduit inspecting method capable of quickly estimating an opened/broken position developed on a gas pipe with good accuracy, for example. CONSTITUTION: A sound is generated at the open end section 16 of a gas pipe 2 hidden by a cover layer (earth) such as a city gas pipe buried in the ground. An acoustic wave is propagated in the gas pipe 2, and the acoustic wave propagated in the gas pipe 2 is received at multiple positions outside the cover layer. The spatial distribution of the received sound quantity is obtained, and the position of the gas pipe 2 or an opened/broken position A developed on the gas pipe 2 is estimated according to the obtained distribution of the received sound quantity. |
