SOUND REFLECTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a sound reflecting device capable of improving detection accuracy in detecting air leakage of a vessel by using acoustic emission. SOLUTION: This sound reflecting device is provided with a hood 21 surrounding the vessel 1 to reflect sound energy Ea in detecting the sound energy Ea generated when gas leaks from a fine leakage part of the pressurized vessel 1, and driving means 25, 26 for driving the hood 21 to surround and open the vessel 1.