CDJ Series Digital Seismic Geophones

 ​ Description

CDJ Series Digital Seismic Sensor (Geophone) are available frequencies from 1Hz to 100Hz vertical and horizontal direction, and geophone-consisted three-component geophones, borehole geophone, tomographic imaging geophone series with stable performance, high fidelity and consistent quality in oil, gas exploration and other fields.

  Applications and Features
1~3Hz geophones applied for deep seismic prospecting, natural earthquake surveillance and prediction, pulse and microseismic measurement for bridge and highways, etc.
4~100 Hz widely used to seismic prospecting of petroleum, coal, metallurgy, defense engineering and etc.
High sensitivity, low-distortion, reasonable damping coefficient, good linear response, good parameter conformity, higher resolution and excellent waterproof property.
Small-sized, easy to install, easy to operate, large ambient temperature range, can meet the demand of multi-wave component seismic data acquisition technology

Technical Specifications
Table 1

Medium–High Frequency (vertical and horizontal) Geophones
Parameter\type name			CDJ-Z/P4	CDJZ/P4.5	CDJ-Z/P10	CDJ-Z/P15	CDJ—Z/P28		CDJ-Z/P30	CDJ—Z/P38
Natural Frequency (Hz)			4±10%	4.5±10%	10±5%	15±5%	28±5%		30±5%	38±5%
Sensitivity G			0.28±5%							0.26±5%
(v/cm.s-1)
Coil Resistance Rc(Ω)			365±5%		365±5%	365±5%	500±5%		500±5%	650±5%
Internal Resistance			345±5%		335±5%	310±5%	415±5%		415±5%	560±5%
（Ω）
Damping Coefficient Bt			0.7±10%		0.58±10%	0.58±10%	0.62±10%		0.6±10%	0.6±10%
Harmonic Distortion D			≤ 0.2
Insulating Resistance			≥ 20
Ri (MΩ)
Coil’S Maximum Displacement P-P(mm)			2
Suspension Mass( g )			13.2		12.8		8.6			7.9
Working Temperature			— 40 ～ ＋ 70
（℃）
Weight ( g )			255