BGK1000

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 Geotomographie. The borehole geophone BGK1000 consists of a downhole probe with a tri-axial geophone sensor and a surface communication unit connected to the USB port of a laptop. Optionally, a hydrophone sensor can be added. 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 (motor-driven 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.

Technical Details

Natural geophone sensor frequency: 15 Hz (others on request)
Sensor arrangement: Tri-axial
Power supply: 12 V input 72 V output
Operational depth: Up to 2000 m
Max. pressure: 200 bar
Temperature range: 0 - 70 °C
Receiver length: 800 mm
Receiver diameter: 60 mm
Receiver weight: 8 kg
Borehole diameter: 75 - 200 mm
Clamping system: Motor-driven clamping arm
Orientation: Magnetic compass (+/- 2.5°)
Communication: 2 wire RS-485
Downhole electronics: DSP = Blackfin 548, 64 MB SDRAM
Cable head: GO-4