BGK 5: Borehole Geophone

The borehole geophone BGK5 is used to receive P- and S-waves in dry or water filled boreholes. The borehole geophone BGK5 consists of four horizontal sensors, separated by 45° intervals, and one vertical sensor. The geophone is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). Air is supplied to the BGK5 through an electro-pneumatic hybrid cable with a Kevlar tension string. The cable is terminated by a connector to the seismograph.

Typical Applications: Downhole surveys, crosshole measurements and shear wave tomography

Included Accessories: Cable on drum, Air pump

Accessories on Request: Toolbox, Adapter cable to connect to seismograph, Clamping tool, Spare aire bladders

Natural sensor frequency: 10 Hz (others on request)

Sensor arrangement: 4 horizontal (45°)/1 vertical

Operational depth: Up to 100 m

Receiver length: 600 mm

Receiver diameter: 51 mm

Receiver weight: 2.8 kg

Cable weight per meter: 145 g

Cable strength: 2150 N

Borehole diameter: 75 mm (or larger if spacers are used)

Clamping system: Inflatable bladder

Depth indicator: Cable marking every 2 m

Connector: To any seismograph

Storage: On drum