| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal defect detection device of a structure capable of detecting surely a fine internal defect in an initial stage of damage progression in a structure such as a concrete structure, for example, in an initial stage caused by deterioration such as a freezing damage or neutralization, and contributing surely to preventive maintenance management of the concrete structure. SOLUTION: An elastic wave oscillation part is formed on the structure, and an elastic wave reception part for receiving the elastic wave oscillated from the elastic wave oscillation part is also formed. An elastic wave is oscillated from the elastic wave oscillation part and the oscillated elastic wave is received by the elastic wave reception part. Then, the ratio between the amplitude or energy of an elastic wave oscillation wavelength and the amplitude or energy of an elastic wave reception wavelength is acquired as an attenuation ratio, and an internal defect and/or an internal defect spot of the structure is detected from the acquired attenuation ratio. COPYRIGHT: (C)2011,JPO&INPIT
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