| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a leakage detection method and device of a buried duct capable of appropriately identifying a leakage sound by separating the leakage sound and a noise even when a continuous sound acting as a noise to the leakage sound occurs.SOLUTION: A leakage detection device 1 of a buried duct includes: a first vibration sensor 5 for detecting a vibration sound generated by fluid leakage from a water service duct (buried duct) 2; and a second vibration sensor 6 for detecting waveform information for subtracting a noise component from waveform information of the first vibration sensor 5. The first vibration sensor 5 is disposed in an exposed section on a piping member 4 of the water service duct 2. The second vibration sensor 6 is disposed in a place (e.g. ground surface G) that is near the first vibration sensor 5 and does not come into contact with the piping member of the water service duct 2.</p> |
