大地电磁天然场远程测量系统的设计

Design of the Remote Measurement System of Magnetotelluric Natural Field

大地电磁天然场测量是地球物理深部探测的重要方法,要求实现长时间的高精度测量,为此设计了大地电磁天然场远程测量系统。系统硬件由传感器、24位ADC数据采集卡、GPRS远程通信电路、PC上位机组成。测试结果表明,系统实现了对大地电磁微弱信号的高精度采集,并能通过GPRS网络将数据远程实时传输至PC上位机,实现现场无人值守测量。同时,系统可开展大地电磁(MT)、音频大地电磁(AMT)、可控源音频大地电磁(CSAMT)等多种测量,可应用在环境、水文、地质灾害监测等其他场合。

The measurement of magnetotelluric natural field is an important method for geophysical deep exploration, in order to achieve long term high precision measurement ; the remote measurement system of magnetotelluric natural field has been designed. The hardware of system is composed of sensors, 24-bit ADC data acquisition card, GPRS remote communication circuit and the PC host computer. The test results indicate that the system carries out high precision acquisition of the weak magnetotelluric signals, and uploads the data to PC via GPRS network in real time j for implementing unattended measurement. In addition, the system is able to perform multiple measurements, e. g. , magnetotellurie {MT）, audio MT （AMT}, and controllable source audio MT （CSAMT）, it can be applied in many fields, including environmental, hydrological, geological disaster monitoring and other occasions.