The VIBSIST-SPH64C uses the Swept Impact Seismic Technique, whereas seismic signals are produced as a rapid sequence of pulses, according to a programmed monotonic time function. This borehole piezo-electric source is intended for borehole investigations to depths up to 2000m. The seismic signals are produced by applying high voltage (6000 V) to a stack of piezoelectric crystals. The minimum borehole diameter is 76mm. The frequency band is 500 - 3500Hz.
The tools consist of two down-hole modules, the piezoelectric actuator and the high voltage supply, and the out-of-the-hole controller. The piezoelectric driven borehole clamping mechanism. The VIBSIST-SPH64C should preferably be used with a seismograph able to record at least 64k-samples and with a sampling speed of 1/8 ms or faster.