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Time Domain Reflectrometry (TDR) and Fiber-Optic Probes for the Cone Penetrometer

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Tech ID: 141
Project Overview
Devices that measure moisture in the subsurface and the groundwater level exist for wells and boreholes but have not been available on a cone penetrometer truck. Rapid determination of groundwater level on sites with few wells or boreholes can speed up site characterization efforts.
Technology Description
A TDR system for measuring moisture content and a fiber-optic probe for measuring pore pressure near the tip of a cone penetrometer have been developed. A cone penetrometer truck uses hydraulic pressure to push a hollow rod through unconsolidated soils to depths as much as 200 feet to characterize subsurface soil properties and to collect soil and groundwater samples.

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