Method of detecting a defective position in a cement intimate mixture filled portion in a building
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United States of America Patent
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-
Apr 24, 1990
Issued Date -
N/A
app pub date -
Feb 24, 1989
filing date -
Dec 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The surface of a cement intimate mixture filled portion in a building is tapped by a hammer, and a tapping sound thus generated is received by a micropone and converted to an electrical signal. The electrical signal representing the attenuation characteristic, which is different depending on the presence or absence of a defective unfilled portion in the cement filled portion, is sampled to obtain a maximum peak value and/or an integrated value. The maximum peak value and/or the integrated value is compared with a reference value to decide the presence or absence of a defect in the cement filled portion.
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