The PS-8R High Resolution Seismic System for Boreholes

Case History

The PS8R consists of a source and an 8-transducer receiver probe, which can be placed in the same or in different holes.The PS-8R can be used for reflection and tomographic studies. Both dry and water-filled holes, of arbitrary inclinations, can be used. The units clamp hydraulically to holes with diameters of 56-100 mm.
The source generates time-coded pulse sequences, which are summed to produce high dynamic broad band records.

The PS-8R is intended for investigations of mine pillars, bridge piles and tunnel walls. The PS-8R is capable of imaging single fractures at a distance of 10-20m, by emitting and recording frequencies of up to 60 kHz.


Specifications
 

Frequency Range		10 - 40 kHz
Depth Range		100 m
Temperature Range		5 - 45°C

Transmitter
 

Programable Sequence of Pulses:		5 pulse types, max. 99 pulses of each type.
Time interval between subsequent pulses:		0.1 - 0.35 s, pseudo-random
Peak Power:		150 W
Dimensions:		length: 1750 mm diameter: 52 mm mass: 11.5

Receiver

Number of Channels:		8
Down-Hole Preamplifier Gain:		Programmable in 8 steps
Frequency Band:		100 kHz
Dimensions:		length: 1850 mm diameter: 52 mm mass: 10.5 kg