The Multistation Borehole Acquisition System (MBAS) is a digital three-component geophone string used to receive P- and S-waves in dry or water filled boreholes. Up to ten individual stations with tri-axial sensors can be connected. The stations are aligned to ensure that all horizontal sensors are oriented in same direction. The system can be oriented from the surface by a torsionally stiff hose. Each station is clamped to the borehole wall by two pneumatic cylinders. An external trigger can be plugged into the USB interface on surface which is connected to a laptop. The operation is entirely controlled by the acquisition software. A separate seismograph is not required.
Technical Details
| Natural sensor frequency: | 10 Hz |
| Sensor arrangement: | Tri-axial |
| Operational depth: | Up to 100 m |
| Max. number of stations: | 10 |
| Station interval: | 1 or 2 m |
| Station length: | 735 mm |
| Station diameter: | 65 mm |
| Station weight: | 2.5 kg |
| Cable weight per metre: | 460 g |
| Borehole diameter: | 75 mm |
| Clamping system: | Pneumatic cylinders |
| Orientation: | Torsionally stiff hose |
| Depth indicator: | Cable marking every 2 m |
| Storage: | On drum and in |
Digitization
| Design: | MoHo s.r.l. |
| Power supply: | PC USB interface |
| A/D conversion: | 24 bit |
| Sampling frequencies: | 256 to 32768 Hz |
| Trace length: | Max. 4 s |
| Trigger: | TTL, geophone |
| Software: | Soilspy (MoHo s.r.l.) |
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Manufactured by Geotomographie GmbH
Technical Details
Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions
