BGK5 – 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.
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 |
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