Long distance measurement over 30m by high-speed non-contact acoustic inspection method using acoustic irradiation induced vibration

摘要

The non-contact acoustic inspection method has been studied using a laser Doppler vibrometer of high sensitivity and a sound source which can generate big sound pressure at a long distance. However, the inspection at the long distance over 10 m was carried out only with the concrete test object. Therefore, for an actual concrete bridge in Japan, the long distance measurement experiment over 30 m was conducted this time.