GSEM-W10 Magneto-telluric Acquisition System

GSEM-W10 Magneto-telluric (MT) Acquisition System

The GSEM Magneto-telluric (MT) Acquisition System is using the latest power and electronic circuit technology, it has the advantages of high precision, low power consumption, strong anti-interference, light equipment and long networking distance. GSEM series collection station can be compatible with various external sensors, carry out MT, AMT, CSAMT and other methods, and use the configured long-distance wireless sensor technology to realize site self-organizing network and distributed construction in mountainous areas, and can complete large-scale construction at a very low cost 2D and 3D exploration.

Applications

● Exploration of metal minerals (copper, gold, silver, lead, zinc, molybdenum, tungsten, tin, antimony, etc.).

● Exploration of non-metallic minerals (graphite, pyrite, salt mine, phosphate mine, etc.).

● Exploration of groundwater, geothermal, etc.

● Exploration of karst, goaf, landslide, etc.

● Exploration of oil and gas.

● Basic research on volcanoes, earthquakes, microbial activities, bird reef evolution, etc.

● Basic research on geological structure, crustal evolution, etc.

Function

● Full waveform array acquisition of magnetotelluric signals.

● Fast parallel calculation of impedance estimation.

● Time series analysis.

● Spectrum and correlation analysis.

● Analysis of instrument host and magnetic rod response.

● Checkpoint and consistency error calculation.

● Data quality statistics.

● Curve book printing.

Features

● Low Power Consumption

With a 20000mAh light 5V output Power Bank support working 2days MT survey

Only 2.5W with 3 sensors

● Low background Noise

3nV/sqrt(Hz) @ 1000Hz AMT 

5nV/sqrt(Hz)@ 1Hz MT

● IoT long distance communication 

With ZigBee technology, It support 1.6km communication

● AI Impedance estimate

Through the AI learning of much data, the supporting software can realize the automatic adjustment of expert level impedance data

● High Power transmitter

Transmitter 10kw(1000V/10A)，50kw(1000V/50A)）

Full-wave Current Record

Parallelable Rectifier Source （10A，up to 200A）

● Fit for all kinds of Magnetic Sensors

Fit for Phoenix Serial Magnetic Sensors

Detailed description

（一）Why we want to develop new generation IoT MT device ?

Previous MT device problem as following:

• The use of battery power supply (V5-2000, ADU-07, etc.), heavy instruments, construction labor intensity, construction in mountainous areas of low production efficiency
• The use of built-in battery power (Aether), often can not pass the aviation safety inspection, the cargo cycle is long
• One operator can control only one instrument, and large-scale construction is costly
• MT impedance estimation also requires manual knitting points and smooth, low production efficiency

IoT MT device Goal and Idea :

• The device power supply by wide-spread 5V power Bank，It was easy transport by  Air
• Based on the ZigBee Tech, a single operator can control more than 200 MT device
• Using the latest low noise amplifier and ADC, the instrument noise is controlled lower 5nV/sqrt(Hz)
• Adopt DSP real-time processing, real-time 50/60Hz multi-notch, multi-band data real-time output
• MT impedance estimation based on artificial intelligence can output MT impedance data of expert-level points directly

（二）Layout The GSEM system supports audio magnetotelluric (AMT), MT or LMT and controlled source audio magnetotelluric (CSAMT) observations. The AMT and MT or LMT observations generally adopt a cross-shaped device, and the CSAMT observation device of controlled source audio magnetotelluric.

Specifications

1. Receiver（AMT&MT Host）

Item	AMT host	MT host
Number of channels	5(Ex、Ey、Hx、Hy、Hz)	5(Ex、Ey、Hx、Hy、Hz)
Bandwidth	1Hz ~ 10kHz	DC~1kHz
Gain	0.1,1,3,9 optional	MT mode 0.1,1,16, 64
GPS synchronization accuracy	30ns	30ns
ADC bit number	32-bits	32-bits
Total dynamic range	160dB	160dB
Single-machine power consumption	＜2.5W	＜2.5W
Sampling frequency	150Hz/ 2400Hz/ 24000Hz	15Hz/ 150Hz/ 2400Hz
Acquisition method	Parallel collection of 3 frequency bands, supporting real-time digital filtering	Parallel collection of 3 frequency bands, supporting real-time digital filtering
Connection	Support Ethernet and WiFi measurement and control	Support Ethernet and WiFi measurement and control
Power supply	Supports universal power bank power supply	Supports universal power bank power supply

2. Transmitter

Item	Parameters
Max Voltage	1000V(2000V，3000V，4000V，Optional need serial connect)
Max Current	3~250A Optional
Composite	Support Serial and Parallel
Frequency	1/8192-8192Hz
Transmitter Wave	Programmable Support Time Domain and Frequency Domain
GPS Sync Accuracy	+30ns
Connect	Wi-Fi, ZigBee(max to 1.6km),Internet
Operating Temperature	-40℃~60℃

3、MT/AMT broadband magnetic rod CMS-01& CMS-04

Item	CMS-01	CMS-04
Frequency range	0.0001 Hz~10 kHz	0.1 Hz~20 kHz
Output sensitivity	0.2 V /(nTxHz)  f≤4 Hz 0.8 V /nT       f≥4 Hz	0.001 V /(nTxHz)  f≤20 Hz 0.02 V/nT        f≥20 Hz
Weight	8.5 kg	3.0 kg
Dimensions	length 1250 mm, diameter 75 mm	length 760 mm, diame ter 63 mm
Power consumption	800 mW	800 mW
Working temperature	-35°C~70°C	-35°C~70°C

Case study

AMT survey （Pb-Zn deposit）

2D inversion models of AMT data resolved by TE mode,TM mode, and D mode, obtained by ZondMT2D focused inversion and the overlap of the D- mode model with the geological model from Figure 3b. TE mode RMS =18.1%.TM mode RMS=9.7%. D-mode RMS=9.1%.

Details provided by: Geotech, Leo.Li
To view the entire detailed introduction, please visit the following link.

https://geotechcn.net/products/electrical-instrument