In situ testing with surface seismic waves of materials having properties that change with time
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United States of America Patent
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-
Mar 10, 1992
Grant Date -
N/A
app pub date -
Jan 5, 1990
filing date -
Jan 5, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An in situ method is disclosed for determining the structural integrity, set time and locations of anomalies or voids within a material as the material is being cured. Surface waves are transmitted and received a known distance along the surface of the material so that a substantially constant surface wave velocity can be calculated by dividing the known distance by the time it takes for the surface waves to travel the known distance. Surface wave velocity remains substantially constant for all wavelength measurements which do not exceed the thickness of the material. Structural integrity of the material, set time of the curing material and the detection of voids within the material can be determined from the substantially constant surface wave velocity. Structural integrity is determined as being proportional to the substantially constant surface wave velocity. Set time is determined from the slope or variation of substantially constant surface wave velocity plotted at various times during the curing process. Voids are determined as locations within the material causing surface wave velocity to change from substantially constant surface wave velocity to substantially non-constant surface wave velocity.
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