China Geophysical Tem Equipment Electric Magnetic Time-Domain Transient Electromagnetic Instrument for 1000m Deep Exploration Instrument

Geophysical TEM Equipment Electric Magnetic Time-Domain Transient Electromagnetic Instrument for Deep Exploration Instrument
Transient electromagnetic method (TEM) is a method of detecting dielectric resistivity by transmitting a primary pulsed magnetic field to the underground by an ungrounded loop or grounded wire source, and observing the secondary induced eddy current field in the underground medium by coils or grounded electrodes during the interval of the primary pulsed magnetic field. Its basic working method is to set up a launching coil with a certain waveform current on the ground or in the air, so as to generate an electromagnetic field in the surrounding space, and generate an inductive current in the underground conductive rock orebody: after power failure, the inductive current decays with time due to heat loss.
Deep TEM Exploration System
Medium-Deep/Deep TEM Exploration System is applicable to medium-deep/deep transient electromagnetic exploration, one of our latest researches, with all functions of transient electromagnetic survey system. It boasts high power, short turn off time, high reliability, strong anti-interference performance (against atmospherics, 50Hz or 60 Hz industrial frequency interference), lightweight and low power consumption.
Transient electromagnetic detection has the following advantages
(1) Because of its high construction efficiency, pure secondary field observation and sensitivity to low resistivity, it has become the preferred method in the current hydrogeological exploration of coalfields.
(2) Transient electromagnetic method (TEM) is the most sensitive method to find low resistivity geological body in high resistivity surrounding rock, and it has no topographic influence.
(3) Using the same point combination observation, it has the best coupling with the detection target, strong abnormal response, simple shape and strong resolution.
(4) Profile survey and bathymetry are completed simultaneously to provide more useful information.

TransmitterTransmitting voltage≤200VTransmitting current≤50ACurrent measurement precisioncurrent range before power supply being cut off is 0~50A, display resolution is 0.01A.Power supply frequencies 0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32HzTransmitting waveform +ON, OFF, -ON, OFF, equal width and dual polarityTurn-off delay time1μs~1000μsTurn-off time≤1.2μs (pure resistance), changing with the transmitting current and transmitting coil when connecting to the coilsDamping resistance1000ΩTransmitting coil0.1kmx0.1km single turn ~ 2kmx2km single turnSynchronization modeexternal synchronization (cable, GPS)Power supplyinternal 12V8.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hoursDimension525x436x217mm 3Weight18.5kgWorking temperature-10°C~+50°C ReceiverNumber of channel1Pre-amplification gain8, 32 timesMain amplification gain1, 2, 4, 8, 32, 64, 128 timesBand-pass0~50k Hz (liner phased filter), full band-pass 0~400k HzSuppression80dB A/D16 bitMin sample interval1μsTrace number≤128Stacking times1~9999 timeSynchronization modeinternal 12V9.6Ah rechargeable battery (or external 12V power supply) lasting for over 10 hoursPocket PCWindows Mobile 6.0 system with software such as Word, Excel, etc., 320x240 true color, 64MB Flash Rom/ 64MB SDRAM/64MB 2GB CF card, able to store over 200,000 readings of sampled data,2 original rechargeable batteriesPortsBluetooth, infrared and serial port Dimension340x295x152mmWeight5.3kgWorking temperature-10°C~+50°C