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CDJ Series Geophones, natural frequency from 1Hz to 100Hz, include vertical geophone, horizontal geophone, bi-component geophone, tri-component geophone and inner-well geophone.
CDJ low-frequency geophones, 1Hz, 2Hz, 2.5Hz or 3Hz, are widely used in deep seismic prospecting, earthquake monitoring, microseismometry in engineering, surface wave survey and low frequency measurement in other fields.
CDJ middle & high frequency geophones, 4,10,15,28,30,40,60,80 or 100Hz, are widely used to seismic prospecting of petroleum, coal, metallurgy, national defense, engineering and etc.
Well-used geophone (shear wave probe) can be used to receive seismic wave in drilling well (diameter ranges from 60 to 110 mm and well depth is 120 meters) with piston-type or electro-magnetic wall-attached devices. Frequency can be selective from 10Hz to 100 Hz.
SPECIFICATIONS(1Hz-2Hz)
CDJ-Z1 | CDJ-P1 | CDJ-S1 | CDJ-Z2C | CDJ-P2C | CDJ-S2C | |
Vertical | Horizontal | 3-C | Vertical | Horizontal | 3-C | |
| Nature Frequency Fn (Hz) | 1±10% | 2±10% | ||||
| Sensitivity in Open Circuit G (v/cm/s) | 2±10% | |||||
| Sensitivity in Shunt G (v/cm/s) | 1.83±10% | 2±10% | ||||
| Damp in Open Circuit Bt | 0.32±10% | |||||
| Damp in Shunt Bt | 0.43±10% | 0.7±10% | ||||
| Coil Resistance Rc (Ω) | 3400±10% | 6040±5% | ||||
| Resistance R (Ω) | 3100±10% | 5650±5% | ||||
| Insulation Resistance R (MΩ) | ≥10 | ≥20 | ||||
| Harmonic Distortion D (%) | ≤0.2 | |||||
| Coil to Case Movement P-P (mm) | 6 | 3 | ||||
| Suspended Mass M (g) | 770 | 60 | ||||
| Operating Temperature (°C) | -25~+55 | -25~+55 | ||||
| Coil diameter (mm) | Ø65 | Ø38.5 | ||||
| Coil Height (mm) | 107 | 47 | ||||
| Coil Weight (mm) | 1.45 | 0.25 | ||||
| Case Diameter (mm) | 160 | 136 | 230 | 55x70 | 55x70 | 128 |
| Case Height (mm) | 138 | 106 | 148 | 87 | 80 | 134 |
| Weight (g) | 8.15 | 3.4 | 10 | 0.48 | 0.48 | 2.35 |
Geophone