Metriguard has developed a prototype device to detect internal decay in wood guardrail posts. This lightweight, portable device is easy to use and can quickly assess the quality of an installed post. While this device is still in the development stage, we believe that a commercial version will be an invaluable diagnostic tool for highway asset management. Future development includes devices specifically designed to detect decay in wood utility poles and bridge timbers.
This device has shown very promising results and demonstrated improved accuracy over sounding and visual inspection in a study conducted by Washington State University for the Washington State Department of Transportation. Link to study.