The BGK1000 is a digital borehole geophone used to receive P- and S-waves in dry and water filled boreholes. It is manufactured by Hinz Messtechnik GmbH and exclusively distributed by us. The borehole geophone BGK1000 consists of a downhole probe with a tri-axial sensor and a surface communication unit connected to the USB port of a laptop. An auxiliary channel can be connected to the surface unit to record an external seismic signal, i.e. a pilot vibrator sweep. Triggering is made via the surface unit allowing TTL pulse, geophone or contact triggering. The borehole geophone is designed to run on a winch equipped with a 4-conductor cable and a Gearhart Owen cable head. The geophone is coupled to the borehole wall by a mechanical clamping system (mechanical arm). A magnetic compass is used to get the sensor orientation in the borehole. Seismic data are stored in SEG2 format by the acquisition software. A seismograph is not required.
The seismic signals are digitized downhole and transfered via RS485 to the Surface Unit. The Surface Unit connects to a standard Windows PC by a USB interface and provides inputs for a trigger, a surface geophone and/or a pilot sweep signal. A robust meachnical arm ensurse a proper clamping to the borehole wall under all conditions.
Natural sensor frequency: 15 Hz
Sensor arrangement: Tri- axial
Power supply: 12 V
Operational depth: Up to 1000 m
Max. pressure: 100 bar
Temperature range: 0 - 70 °C
Receiver length: 800 mm
Receiver diameter: 60 mm
Receiver weight: 7.2 kg
Borehole diameter: 75 - 100 mm (others on request)
Clamping system: Mechanical arm
Motor Controller: H-Bridge
Orientation: Magnetic compass (+/- 2.5°)
Telemetry: RS485
Downhole electronics: DSP Blackfin 548, 533 MHZ, 64 MB DDR SRAM
A/D conversion: 24 bit
Sampling frequencies: 250, 500, 1000, 2000, 4000, 8000, 16000, 48000 Hz
Trace length: Max. 21 s
Trigger: TTL, geophone, contact
Software: SmartRec (Geotomographie)
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