Two different types of sources can be connected to the same power supply IPG5000 which supplies both P- and S–wave source with energy of 5000 V.
The borehole source SBS42 generates compressional waves (P) in water filled boreholes. The seismic signals are highly repeatable. Energy released by the IPG5000 discharges through a coaxial cable terminated by two adjacent spark electrodes. The spark discharge vaporizes water by a high-pressure plasma. This generates vapour bubbles which expand and collapse, thereby generating high-frequency seismic waves.
| Generated wave types: | P |
| Signal frequencies: | Up to 5 kHz (depending on geology and borehole distance) |
| Operational depth: | Up to 400 m |
| Source length: | 645 mm |
| Source diameter: | 45 mm |
| Source weight: | 3.8 kg |
| Cable weight per metre: | 206 g |
| Cable strength: | 3400 N |
| Borehole diameter: | Min. 50 mm |
| Clamping system: | Not required |
| Depth indicator: | Cable marking every 2 m |
| Connector: | To Impulse Generator IPG5000 |
| Storage: | On drum |
The borehole source BIS-SH generates horizontally polarized shear waves (SH) and compressional waves (P). The seismic signals are highly repeatable. The source works in dry or water filled boreholes and can be used in vertical or horizontal boreholes.
Energy released by the IPG5000 discharges through a system of electromagnetical coils adjacent to a copper plate. If the plate is rejected a mechanical impact to the borehole wall is generated. The borehole source is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). The orientation of the source is controlled from surface by a torsionally stiff hose.
|
Generated wave types |
SH/P |
|
Signal frequencies: |
Up to 4 kHz (depending on geology and borehole distance) |
|
Operational depth: |
Up to 100 m |
|
Source length: |
880 mm |
|
Source diameter: |
65 mm |
|
Source weight: |
8.5 kg |
|
Cable weight per metre: |
665 g |
|
Borehole diameter: |
75 - 100 mm (or larger if spacers are used) |
|
Clamping system: |
Inflatable bladder |
|
Orientation: |
Torsionally stiff hose |
|
Depth indicator: |
Cable marking every 2 m |
|
Connector: |
To Impulse Generator IPG5000 |
The impulse generator IPG800 is developed to supply energy of 800 V only to the smaller S-wave source type.
The borehole source BIS-SH-DS generates horizontally polarized shear waves (SH) and compressional waves (P). The seismic signals are highly repeatable. The source works in dry or water filled boreholes and can be used in vertical or horizontal boreholes. Energy released by the IPG800 discharges through a system of coupled coils. They generate a mechanical impact to the borehole wall that releases seismic waves.
The borehole source is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). The orientation of the source is controlled from surface by a torsionally stiff hose.
|
Generated wave types: |
SH/P |
|
Signal frequencies: |
Up to 4 kHz (depending on geology and borehole distance) |
|
Operational depth: |
Up to 60 m |
|
Source length: |
880 mm |
|
Source diameter: |
65 mm |
|
Source weight: |
8.5 kg |
|
Cable weight per metre: |
665 g |
|
Borehole diameter: |
75 - 100 mm (or larger if spacers are used) |
|
Clamping system: |
Inflatable bladder |
|
Orientation: |
Torsionally stiff hose |
|
Depth indicator: |
Cable marking every 2 m |
|
Connector: |
To Impulse Generator IPG800 |
|
Storage: |
On drum |
