| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for automatically computing the propagation velocity of ultrasonic waves through concrete and which are capable of determining the velocity of sound without the requiring skills and thereby accurately measuring the thickness of a concrete structure, the depth of cracks, cavities, etc. SOLUTION: The velocity of sound through concrete required, when the thickness of a concrete structure, the depth of cracks, cavities, etc. are measured through the use of ultrasonic waves is measured by installing transmitting and receiving probes on the surface of the concrete at a fixed distance (d) from each other, acquiring waveforms, automatically computing a propagation delay time To between the transmission and reception of ultrasonic waves, and dividing the fixed distance (d) by the propagation delay time To. COPYRIGHT: (C)2006,JPO&NCIPI
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