Method of detecting a defective position in a cement intimate mi

Details Method of detecting a defective position in a cement intimate mi Method of detecting a defective position in a cement intimate mi

1989-02-24

1990-04-24

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73 12, G01M 700

Patent

active

049189883

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.

REFERENCES:
patent: 2635746 (1953-04-01), Gordon
patent: 3623358 (1971-11-01), Sugimoto
patent: 4163393 (1979-08-01), Gutierrez et al.
patent: 4402210 (1983-09-01), Vendeberg
patent: 4534206 (1985-08-01), Kiso et al.

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