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《Journal of Vibration and Shock》 2008-02
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A NOVEL GEOPHONE WITH HIGH ACCURACY

TANG Dong-lin,LIANG Zheng,CHEN Hao(School of Mechanical & Electronic Engineering of SWPU,Chengdu 610500,China)  
A novel and improved compact geophone with high sensitivity and low distortion is presented,it is suitable for high resolution seismic exploration.In order to design a high accuracy geophone with high sensitivity and low-distortion,the electromagnetic field in a geophone is studied systematically.It is found that the uniform and high magnetic flux density in a geophone's annular space is important for the geophone to obtain high sensitivity and low-distortion.The unique geophone design method,the radial magnetic field design and the optimizing structure design are proposed.A new radial-magnetization FeCo magnet and a professional software for magnetic circuit design are introduced.The desirable magnetic flux density in the geophone's annular space is obtained.The width of the uniform magnetic field is 13 mm and the magnetic flux density is 560mT.Specifications of the high accuracy geophone are as follows: Frequency: f=10Hz±2.5%,Sensitivity: S=280mV/cm/s±2.5%,damping: b=0.7,and distortion: d0.05%.
【Fund】: 石油天然气装备教育部重点实验室资助项目:2006STS04
【CateGory Index】: P631.436
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