The Mini-Geophone M40 is used to receive P- and S-waves in horizontal boreholes. The borehole geophone consists of a tri-axial sensor. The geophone is coupled to the borehole wall by a pneumatic clamping system (inflatable bladder). Air is supplied to the M40 through the cable. The orientation of the M40 geophone is controlled from surface by a torsionally stiff hose. The cable is terminated by a connector to the seismograph.
Technical Details
Geophone sensor: | GS14-L9 |
Natural sensor frequency: | 28 Hz |
Sensor arrangement: | Tri-axial |
Operational depth: | Up to 10 m |
Receiver length: | 405 mm |
Receiver diameter: | 42 mm |
Receiver weight: | 3 kg |
Cable weight per metre: | 480 g |
Borehole diameter: | 50 mm (or larger if spacers are used) |
Clamping system: | Inflatable bladder |
Orientation: | Torsionally stiff hose |
Depth indicator: | Cable marking every 2 m |
Connector: | To any seismograph |
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