Digital P-S Suspension Probe
Well Logging System
    Model:Digital P-S Suspension Probe
    Country of Origin:England
    Use:The P-S suspension probe is a low-frequency acoustic sonde designed to measure compressional and shear-wave velocities (slowness) in soils and soft-rock formations. It operates using indirect-excitation rather than mode conversion as in a conventional sonic. It is capable of acquiring high-resolution P and S wave data in borehole depths of up to 1000m.
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The P-S suspension probe contains a unique-design of powerful hammer source and two receivers, separated by acoustic damping tubes. To acquire data, the probe is stopped at the required depth and the source is fired under surface command. Firing causes a solenoid-operated shuttle aligned across the borehole axis to strike plates on opposite sides of the probe in turn, setting up a pressure doublet in the surrounding fluid. The resultant fluid motion produces a tube wave at the borehole wall with velocity close to the shear velocity of the formation together with a compressional wave. As the waves propagate parallel to the borehole axis, they set up corresponding fluid movements that are detected by the two neutral-buoyancy 3D hydrophone receivers, allowing the wave velocity to be directly measured. The facility to stack multiple shots and filter the data as in normal seismic data acquisition is included in the operating software.


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