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Specialising in on-line
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 Acoustic Velocity System Overview The system is
designed to allow the collection and analysis of acoustic velocity from a
sample held under hydrostatic conditions in a core flow cell. Separate pumps
allow the application of measured pore fluid pressure and hydrostatic pressure.
The Pore Pressure application unit is a floating piston device, which
allows the aqueous pore fluid to be separated from the oil-filled hydraulic
pump generating the pressure.
Hydrostatic Cell The
cylindrical core flow cell has removable end plugs, which allow for easy sample
loading and unloading. The end plugs are retained by threaded rings, which
screw into the cell. The cell can be rotated on its stand for easy access to
each end in turn. The sample is located between two platens, which contain the
acoustic transmitter and receiver stacks. The platens are forced into contact
with the sample as a result of the application of the totally surrounding
hydrostatic pressure.
 The cell end
plugs provide interfaces for the pore pressure lines, temperature sensor and
electrical signals. Hybrid signal cables are terminated at the intermediate
sockets on the bottom end plug, where they are separated into acoustic and
switching functions. The hybrid cables comprise a coaxial acoustic line and a
multi-core relay-switching line. All the lines go through high-pressure
electrical feedthrus in the cell base plug. Inside the cell, separate lines
fitted with miniature Fischer multi-core and Microdot co-axial connectors
attach to the platens and the cell base plug. Plugs and receptacles are
designed for rapid and reliable mounting and dismounting of core
samples.
The Digital Storage Oscilloscope allows the user to
visualise the received waveform from the test core sample. In addition,
spectral analysis can be performed in real time. A computer interface and
software allows the waveform to be captured for analysis and report
generation.
 Mounted at the rear of the cell stand is the Uni-axial
Straining Frame. This is designed as an assembly aid for the core sample and
provides a secure mounting for the base platen. The straining rods and the
upper yoke piece allow the application of strain to the sample so that the
performance of the test core sample and acoustic stacks can be evaluated before
the sample is loaded into the cell. It is possible to perform testing of the
core sample in a sleeved (shown here) or un-sleeved condition
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