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Tomo-1 Option:
Available for the Following Systems |
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Advantages |
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Crosshole Sonic Logging
(CSL)
+ Tomographic Velocity Imaging
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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.
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Ultrasonic Pulse Velocity
(UPV)
+ Tomographic Velocity Imaging
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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.
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Crosshole Seismic/Downhole Seismic (CS/DS)
+ Tomographic Velocity Imaging
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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.
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