基于微机电加速度传感器的海底地震仪
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摘要
针对目前海底地震仪广泛使用的动圈传感器灵敏度低、动态范围小、抗干扰能力差,提出了基于MEMS加速度传感器的海底地震仪。该地震仪以MEMS加速度传感器替换了动圈传感器,采用多通道采集三分量数据,利用倾角传感器和磁阻传感器取代机械结构实现地震数据的水平校正和获取方位信息,并采用SD卡作为大容量存储装置。为将加速度信号还原成真实的速度或位移信号,采用拟合多项式的方法消除加速度积分过程中产生的趋势项,提高加速度信号的转化精度。实验表明,该海底地震仪具有频带宽、噪声低、功耗小等优点,更适合海底地震信号的多场多分量测量。
The traditional ocean bottom seismometers(OBS)for seismic wave field measurement was of low sensitivity,small dynamic range and poor anti-jamming.In order to improve the performance of OBS,a new ocean bottom seismometer based 3-component MEMS accelerometer sensors was developed.A multichannel A/D unit was designed to sample seismic data synchronously,meanwhile,the tilt sensor and magnetoresistance sensor replaced the mechanical structure for compensating seismic data and got attitude information.An SD card was involved to storage sampling data in a handle and sophisticated equipment.In order to get real seismic displacement data,polynomial fitting method was used to remove the trend in integral.Testing results showed that the new measurement system was of high dynamic range,low noise that suited for the high resolution seismicity information in ocean bottom seismic wave field measurement.
The traditional ocean bottom seismometers(OBS)for seismic wave field measurement was of low sensitivity,small dynamic range and poor anti-jamming.In order to improve the performance of OBS,a new ocean bottom seismometer based 3-component MEMS accelerometer sensors was developed.A multichannel A/D unit was designed to sample seismic data synchronously,meanwhile,the tilt sensor and magnetoresistance sensor replaced the mechanical structure for compensating seismic data and got attitude information.An SD card was involved to storage sampling data in a handle and sophisticated equipment.In order to get real seismic displacement data,polynomial fitting method was used to remove the trend in integral.Testing results showed that the new measurement system was of high dynamic range,low noise that suited for the high resolution seismicity information in ocean bottom seismic wave field measurement.
引文
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[2]Dorman L M.ULF/VLF Noise on Basalt and Sediment(NOBS)[R].University of California,San Diego Scripps Institution of Oceanography,1997,
[3]崔培,王纪会,李彪.基于耦合理论的海底地震仪设计方法研究[J].舰船科学技术,2010,32(4):90-96.CUI Pei,WANG Jihui,LI Biao.Research of design method for ocean bottom seismometer based on the coupling theory[J].Ship Science and Technology,2010,32(4):90-96.
[4]王建锋,马建,马荣贵,等.动位移的加速度精确测量技术研究[J].计算机科学,2010,37(12):201-203.WANG Jianfeng,MAJian MA Ronggui,et al.Study on calculation of dynamic displacement from time-frequency integration of acceleration[J].Computer Science,2010,37(12):201-203.
[5]Laine J,Mougenot D.Benefits of MEMS based seismic accelerometers for oil exploration[C]//The 14th International Conference on Solid-State Sensors,Actuators and Microsystems.France.ICSSAM,2007.
[6]Fry B D.Test and evaluation of the micro-observer sensor system use a seismic surveillance device in an integrated sensor[D].California:Naval postgraduate school,2007.
[7]TEXAS Instrument.MSP430X5XX User Guide[R].USA:Texas instruments,2002.
[8]Lecheng.LCW-S03data storage module with SD card of user guider[Z].USA:LeCheng technology,2004.
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