The Hanford Site is currently in the process of an extensive effort to empty and close its radioactive single-shell and double-shell waste storage tanks. Before this can be accomplished, it is necessary to know how much residual material is left in a given waste tank and the chemical makeup of the residue. The objective of Mississippi State University’s Diagnostic Instrumentation and Analysis Laboratory’s (DIAL) efforts is to develop, fabricate, and deploy quantitative inspection tools for the Hanford waste tanks that will be remotely operable and that will provide quantitative information on the amount of wastes remaining. A collaborative arrangement has been established with the Hanford Site to develop probe-based inspection systems for deployment in the waste tanks. DIAL’s inspection approach is to independently and quantitatively estimate the amount of residual waste by using Fourier-transform profilometry (FTP) and stereovision. FTP is a noncontact 3-D shape measurement technique. By projecting a fringe pattern onto a target surface and observing its deformation due to surface irregularities from a different view angle, FTP is capable of determining the height (depth) distribution of the target surface, thus reproducing the profile of the target accurately. DIAL has previously demonstrated that its FTP system can quantitatively estimate the volume and depth of removed and residual material to high accuracy. To date, the DIAL FTP system has obtained preliminary results utilizing conditions appropriate for the Hanford waste tanks. A prototype telescoping probe design for FTP deployment within the Hanford tank has already been completed and is being tested. Stereovision also provides 3-D determinations of depths/heights by combining images simultaneously recorded by two (or more) cameras from different viewpoints. Volumetric determinations by two independent methods will permit more accurate determination of the volume and the associated uncertainty.
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