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.
Technical Details
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 metre: | 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 |