Seismic Sensor Borehole Triaxial Geophones Downhole or Crosshole Borehole 3D Geophone

• Customization: Available
• Accuracy: <1mm
• Horizontal Line: 1
• Model NO.: GDJ-DJ
• Vertical Lines: 1
• Application: Borehole Seismic Survey
• Frequency (Hz): 4Hz-100Hz
• Cable Depth: 60m/120m
• Working Mini Diameter: 70-120mm
• Working Temperature: 25~55
• Transport Package: Wooden
• Trademark: GOLD
• Origin: Chongqing, China
• Production Capacity: 5000pices/Year

Product Description

Seismic Sensor Borehole Triaxial Geophones Downhole or Crosshole BOREHOLE 3D GEOPHONE

 

Product Description

 The Borehole Triaxial Geophone is lowered into a borehole to measure ground vibration in three planes: vertical, transverse and longitudinal. Vibrations from construction activities, blasting and other applications can travel through the ground and cause damage to underground structures. The Borehole Geophone can be lowered into a hole to monitor the effects of the vibration directly next to the structure without the need for regression analysis.

 

Technical Specification for Borehole Triaxial Geophone

Model	GDJ-DJ	GDJ-JG	GDJ-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
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

 

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.

Working Principle

It is mainly based on the principle of electromagnetic induction or piezoelectric effect. Taking electromagnetic induction as an example, when the coil of the detector moves relative to the magnetic field due to vibration, an induced electromotive force will be generated according to Faraday's law of electromagnetic induction. In a three-axis detector, there are three independent induction systems, corresponding to the three axes. The combination of induction coils and magnets in each axis can independently convert the vibration in that direction into an electrical signal. For a piezoelectric three-axis detector, when the crystal is subjected to pressure (caused by vibration), an electric charge will be generated on the surface of the crystal, and the vibration signals of the three axes will be obtained through the piezoelectric crystals in three directions.