TOMO-1 Options

Tomo-1 Option:
Available for the Following Systems

Crosshole Sonic Logging (CSL)

+ Tomographic Velocity Imaging

Crosshole Tomography (CT) testing and analysis is used to generate velocity images of anomalies between tested tube pairs in order to better judge the extent and severity of defects. With the CSL-2 Tomo software, the CT method uses data from multiple CSL logs at different source-receiver height offsets to generate 2-D image slices of the material between a pair of access tubes in a shaft. When data is collected between multiple access tubes, the data sets can be combined to create a 3-D image model of the interior of the shaft concrete, delineating defects.

Ultrasonic Pulse Velocity (UPV)

+ Tomographic Velocity Imaging

Ultrasonic Pulse Velocity (UPV) Tomograms are generally used to map out the location, extent, and severity of defects in structural members. This method takes advantage of the multiple crossing test paths generated by combining direct, semi-direct, and indirect UPV testing. This data, once picked for First Arrival Time (FAT), is used to generate 2-D or 3-D velocity images. This data and model can often be a valuable resource when repairs are needed on structural members because it provides the information necessary to isolate the problem. Sonic Pulse Velocity (SPV) data is used to provide velocity images of massive dams, bridge substructures, etc.

Crosshole Seismic/Downhole Seismic (CS/DS)

+ Tomographic Velocity Imaging

The tomographic velocity images created from data acquired during Crosshole Seismic/Downhole Seismic (CS/DS) tests are generally used to look at the material properties of soil/rock. More specifically, this technique is ultimately useful to image the lateral/vertical changes in material properties for a more complete site characterization. This method uses compressional or shear wave arrival time data collected at different source-receiver height offsets to generate a 2-D image slice between boreholes. When more than two boreholes are available, then the testing can be conducted such that a 3-D image model of the material between multiple test tube pairs can be generated.