Geotomographie - Model BHC5 - Hydrophone String for Borehole Receivers
From Borehole Receivers
The hydrophone string BHC5 is used to receive P-waves in water filled boreholes. This receiver is used for P-wave tomography is a standard method for high-resolution geological structure exploration between boreholes. P-waves are generated in one borehole and being transmitted to the other. P-wave tomography measurements are easy to analyze due to the easy recognition of the first arriving seismic waves.The BHC5 reciever consists cable drum, hydrophones moulded on cable and battery box for pre-amplication. Accessories, such as a cable spooler device for cable on drums and a clamping device supports a proper positioning and clamping the cable during operation.
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Product Details
The BHC5 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 battery cells. The BHC5 amplifier boards are equipped with an internal test function to allow a quality check at any time. The test function outputs a synthetic signal on each channel where the amplification factors can be evaluated. 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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