Measuring and testing – Vibration – By mechanical waves
Patent
1998-02-11
2000-12-12
Kwok, Helen C.
Measuring and testing
Vibration
By mechanical waves
73627, G01H 500
Patent
active
061582840
ABSTRACT:
Methods and apparatus enabling the length of a reinforcing geogrid for earthen structures to be determined even when the geogrid is buried. The preferred geogrid body comprises a plurality of spaced apart, elongated spans that are regularly intersected by similar, elongated, transverse spans. Voids defined between intersecting body spans facilitate the attachment of the geogrid to retaining walls, or other wall or earthen structures. A test line, preferably an electrically conducive wire, is molded into the geogrid body. The length of this conductor is electrically calculated and displayed to determine the length of the buried geogrid. Preferably an electrical pulse is generated and applied to the geogrid and a return echo is thereafter detected. The time difference between the pulse application and the return echo is electrically sampled and correlated to the conductor length. In alternative embodiments either sonic or light energy is applied to the test line for measurements. Thus it can be determined if the installed geogrid is in compliance with architectural plans, drawings or the like.
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Carver Stephen D.
Kwok Helen C.
Verigrid Inc.
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