Design Of High-density Electrical Data Acquisition System

Currently high-density electrical equipment for weak signals from deepunderground poor weak signal interference.When using the measuring deviceSchellenberg means poor immunity issues become more prominent.A lot ofsurrounding urban areas for ground exploration,urban and rural residents interferenceand high-voltage electrical equipment and other facilities caused by very strong,which is usually greater than the magnitude of the interference to the electrical signalamplitude.Limited depth of the instrument probe,we know the geometry is based onthe sounding of the pole pitch of the method is increased to expand the power supplyelectrodes depth,but this will be subject to the exploration area so that the area of themeasuring line to increase the length of the sounding reach the purpose difficult toaccomplish.The traditional high-density electrical AB equipment powered electrodeand the measuring electrode MN in the same cable line,In this case can only lead tothe survey line arranged in the cable where this line,This limits the application ofhigh-density electrical field in a large extent.Existing high-density electricalinstruments only measure AB electrodes current and MN electrode voltage,For ABelectrodes voltage is calculated to obtain the current through the electrode.AlthoughAB electrode voltage waveform can in theory, But the actual emission process isinevitable to be affected by the external environment, then there will be differencesbetween the actual transmit waveform is not considered if the data processing,Thefinal analysis will affect the measurement accuracy;Further,if the calculation of thecurrent through the AB electrode to obtain AB electrodes voltage,the noise isintroduced into the earth,The accuracy of the data processing and analysis equallyinfluential.Aiming at the high-density electrical problems in measuring instrumentsproposed a high-density electrical measuring instruments overall design,using apseudo-random coding technology,can improve electrical instrument noise immunity.Instruments used in mixing launch divider receives ways one can reduce theamount of labor,improve work efficiency,On the other hand,in the frequency domaindo amplitude-frequency curve,the signal processing performed a greater depth ofdetection.Additional way AB electrode voltage measurement channels to achievethree-channel synchronous acquisition. Electrodes conversion can be flexiblycontrolled,the number of electrodes can be increased or decreased according to theactual work situation,a electrode small cable-power,small size,easy to carry and clothpole.The electrical instrument can achieve both high-density electrical measuringwork,but also can achieve all the functions of an ordinary electrical equipment.