SYSTEM OF ACTIVE ELECTROMAGNETIC MONITORING OF EARTH CRUST SEISMICALLY ACTIVE ZONES Russian patent published in 2010 - IPC G01V3/08 

FIELD: mining.

SUBSTANCE: system consists of control centre, data gathering and processing. The said centre is connected with generator unit and network of measurement stations by means of radio links according to linear network circuit. Each measurement station includes electromagnetic sensor unit that is connected to digital measurement station and data transmitting unit performed in a form of wireless modem. Data transmitting unit is connected with digital measurement station by double-linked communication lines. Measurement station involves test signal generating unit and analog-digital converter (AD converter) connected to instrument amplifier unit and micro computing device. Test signal generator is capable to form calibrated signals under the control of micro computer and is connected via its outputs to electromagnetic sensor unit. The equipment of digital measurement stations and generating unit includes navigation satellite system receiver, precision temperature-compensated voltage controlled crystal oscillator of timing pulses, drive voltage forming unit for precise adjustment of timing pulses generator frequency. Navigation satellite system receiver is connected with micro computer via double-linked communication lines of serial interface. Timing pulse generator is connected by its output to AD converter sync input and in case of generator unit it is connected to diagnostic and control system input. Drive voltage forming unit is connected to micro computer via system integrated busbar. The first input of the said unit receives sync signals generated by navigation satellite system receiver, and the other input (feedback input) receives high-frequency pulses from timing pulse generator output. In its turn timing pulse generator input is connected to control voltage forming unit output.

EFFECT: metering accuracy improvement.

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