| Customization: | Available |
|---|---|
| Accuracy: | Downhole Seismic Testing ASTM D7400 Downhole Seism |
| Horizontal Line: | Downhole Seismic Testing ASTM D7400 Downhole Seism |
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Downhole Seismic Testing ASTM D7400 Downhole Seismic Test for geotechnics Geophysical Surveys Cross Hole Test Seismograph Cross Hole Seismic Tomography
Downhole seismic test is complete unit downhole seismograph, included ground monitor, software, donwhole geophone ( donwhole sensor). The depth will be 60m and 120m.
Downhole seismic test is an in-situ test and determine the velocity of primary (P) and secondary (S) seismic waves to provide the elastic soil parameters. The P and S waves velocities are used in geotechnical foundation analysis, static and dynamic soil analysis, liquefaction assessment and etc.
Downhole seismic testing is one field test that is commonly used to determine compression-wave (P) and shear- wave (S) velocity profiles in geotechnical earthquake engineering investigations.
Crosshole (or "crosswell") seismic measures the velocity of seismic waves between boreholes.
CDJ-JG38 down-hole three-component geophone, is a kind of electrodynamics velocity sensor, generally used to receive seismic waves down the hole. The geophone is made up from 3 high-sensitivity orthogonal Cartesian coordinates, which can sense the seismic wave from the 3-directions respectively. There is a air-lock device, being to suit for drilling well of a diameter of Φ50~Φ110 (if the diameter is more than Φ110, we will supply additional chock ). Mechanic one can couple rigidly with the well utmost, so it can reflect seismic real signals better and avoid the trouble of lacerating the gasbag. Utilizing a special cable and gas tube, lightweight (total of 120m of cable and gas tube is 17Kg, total of 60m cable and tube is 12Kg).
Downhole Seismic Testing ASTM D7400 Downhole Seismic Test for geotechnics Geophysical Surveys Cross Hole Test Seismograph Cross Hole Seismic Tomography
Downhole Seismic Testing ASTM D7400 Downhole Seismic Test for geotechnics Geophysical Surveys Cross Hole Test Seismograph Cross Hole Seismic Tomography
Technical Specifictaion
| Model | DJ | JG | JF |
| / | Electromagnetic borehole geophone series | Piston type borehole geohphone series | Non-adjacent borehole geohphone series |
| Frequency (Hz) | 4HZ-100HZ optional | 4HZ-100HZ optional | 4HZ-100HZ optional |
| Working Mini Diameter (mm) | Φ70-φ120 | Φ50-φ110 | Φ50 |
| Working Temperature | 25~55 | 25~55 | 25~55 |
| Diameter(mm) | φ55 | φ50 | φ45 |
| Height (mm) | 465 | 500 | 300 |
| Weight (kg) | 60m-10kg, 120m-14kg | 60m-12kg,120m-17kg | 60m-60kg,120m-10kg |
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