BHC4 – Hydrophone String
The hydrophone string BHC4 is used to receive P-waves in water filled boreholes. The BHC4 consists of a downhole cable containing a Kevlar tension string and a number of moulded hydrophones at pre-defined intervals. Each hydrophone consists of a sensor with a pre-amplification board. The electronic boards are powered from the surface by a bank of rechargeable AA cells. The cable is terminated by a connector to the seismograph.
Technical Details
| Hydrophone sensor: | SQ54 or AQ2000 |
| Frequency response: | Flat from 1 to 10.000 Hz |
| Pre-Amplification: | 4 or 10 x |
| Power supply: | AA cells (battery box on surface) |
| Operational depth: | Up to 500 m |
| Number of hydrophones: | 24 (others on request) |
| Hydrophone interval: | 1 m (others on request) |
| Hydrophone diameter: | 38 mm |
| Cable weight per metre: | 200 g |
| Cable strength: | 4700 N |
| Borehole diameter: | Min. 50 mm |
| Depth indicator: | Cable marking every 2 m |
| Connector: | To any seismograph |
| Storage: | On drum |
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