| 摘要 |
PROBLEM TO BE SOLVED: To surely detect an impact elastic wave propagating in concrete; and to accurately calculate the propagation velocity of the elastic wave. SOLUTION: A plate-like first vertical wall 21 and a second vertical wall 22 are supported by a frame 30. The vertical walls 21 and 22 are arranged along a virtual surface xy, and is brought into contact with a concrete surface B. Sensors 41 and 42 are arranged on this side of the vertical walls 21 and 22 as shown in the figure, that is, a downstream side of a first direction (x). When the elastic wave is propagated in the concrete from the first direction (x), the elastic wave is surely detected by the sensors 41 and 42. Based on the time difference between the detection time, the propagation velocity of the elastic wave can be accurately calculated. COPYRIGHT: (C)2009,JPO&INPIT
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