China Tem Equipment Geo Transient Electromagnetic Test Instrument Tdem Time Domain Electromagnetic Survey Intrument

TEM Equipment GEO Transient Electromagnetic Test Instrument TDEM Time Domain Electromagnetic Survey Intrument
The transient electromagnetic system is the latest scientific research achievement of our company. It is the leader of similar transient electromagnetic systems at home and abroad. It has large transmitting power, fast turn-off, high reliability and super anti-interference (50 or 60Hz power frequency). ) Ability, light weight, low power consumption. Its WTEM-2J transient electromagnetic survey system receiver can work with WTEM-1D high-power transmitter to complete deep exploration tasks, and can work with WTEM-1X low-power transmitter to complete shallow exploration tasks. Usually, when a double loop or a center loop is used, one transmitter is used with one receiver; when a large loop is used, one high power transmitter can be used with multiple receivers.
Users can reasonably select devices for different geological problems, and complete geological tasks such as rapid census, three-dimensional mapping, deep prospecting and shallow sounding. The system is mainly used for metal ore, coal field, oil and gas field, geothermal, hydrogeological engineering and other survey work
1. Three-component simultaneous observation
2. Turn-off time is short and the amount of information is large: Turn-off time is one of the important technical indicators of the transient electromagneticmeter. If the turn-off time is long, the shallow signal will be lost, the secondary field strength will be weakened, and the detection effect will be directly affected. The turn-off time of PROTEM47 can be as short as 0.5μv. The turn-off time depends on transmitter performance, emission current magnitude and transmit coil size.
3. High resolution and large dynamic range: the transient electromagnetic field changes from early to late from n x 105μv to 0. nμv. Up to 6 orders of magnitude, so signal resolution and dynamic range are required to be high. PROTEM's signal resolution is 24 bits, the system resolution is 29 bits, and the dynamic range is 175dB.
4. High signal-to-noise ratio: The PROTEM transient electromagnetic instrument adopts various measures to improve the signal-to-noise ratio, including suppressing power frequency interference, adopting "smart overlay" technology and increasing the repetition rate. The repetition rate is how many bipolar pulses can be emitted within 1 second. The repetition rate of PROTEM is 237.5HZ-0.25HZ, which is 4.2ms-25ms, optional. Therefore, it can transmit 14,250-2,400 pulse signals and receive as many transient electromagnetic signals in a 30 second observation period. If the repetition rate is 25HZ-0.416HZ, ie 40ms-24,000ms, it can only transmit and receive 1,500 -0.083 signals in the 30 second observation time, that is, the former is better than the latter in the
same observation time. 10 times higher than the height.
TEM Equipment GEO Transient Electromagnetic Test Instrument TDEM Time Domain Electromagnetic Survey Intrument
5. Observers are flexible: There are five field observation devices for transient electromagnetic methods, which are suitable for different exploration targets and depths. The five devices are: 1 overlapping return line, 2 center return line, 3 dipole 4 large fixed return lines, and observations within 5 major return lines. The first three devices are suitable for shallow exploration and the latter two are suitable for deep exploration. Since the PROTEM transient electromagnetic instrument uses a separate structure for transmitting and receiving, it is suitable for the other four devices in addition to the overlapping loop device. However, if the integrated transmitting and receiving device is used, it is only suitable for the overlapping loop device. When the other four observing devices are used, the weak transient field signal in the receiving coil must be transmitted to the receiving with a long signal cable. Machine, which brings unpredictable interference.
6. High stability and wide operating temperature: Stability includes observational repeatability and instrument failure rate. PROTEM has an observational repeatability of 100% and instrument failure is extremely low. PROTEM operates over a temperature range of -40°C to +60°C and can be observed smoothly in any region in any season; if the operating temperature range is narrow, field observations can only be made in the appropriate season or in the appropriate area.

Transmitting voltage≤200VTransmitting current≤50A (WTEM-1D); ≤30A(WTEM-1Z)Current measurement precisioncurrent range before power supply being cut off is 0-50A, display resolution is 0.01APower supply frequencies0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32HzTransmitting waveform+On, Off, -On, Off, equal width and dual polarityTurn-off delay time1us-1000usDamping resistance1000Ω (WTEM-1D); 110-1000Ω, in all 16 notches optional (WTEM-1Z)Transmitting coil0.1kmx0.1km single turn-2kmx2km single turn (WTEM-1D)
0.05kmx0.05km single turn-1kmx1km single turn (WTEM-1Z)Synchronization modeexternal synchronization (cable,GPS)Power supplyinternal 12V rechargeable battery (or external 12V power supply) lasting for over 10 hoursDimension525x436x217mm (WTEM-1D); 486x392x192mm (WTEM-1Z)Weight18.5kg (WTEM-1D); 12kg (WTEM-1Z)Working temperature-10ºC- +50ºC