Slim-Hole Full-Waveform Triple Sonic Probe
GeoLog Pty Ltd
Geophysics, Borehole Survey
This highly compact tool is designed specifically for geotechnical and mining applications. The probe measures high (HR) and medium (MR) resolution transit-time and full-waveform data simultaneously from three receivers. The HR measurement gives good resolution of bed boundaries while the MR provides the average formation velocity even in the presence of moderate caving. Shear-wave velocities from full-wave data may be used to calculate rock elasticity parameters.
Principles of Measurement
The piezoelectric transmitter is stimulated by a high-voltage pulse and radiates a high-frequency sonic wave through the borehole fluid and formation to a receiver. An accurate quartz clock measures the first arrival transit time.