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WIDE BAND MAGNETOTELLURIC STATION LEMI-418 FOR FIELD SURVEY

Main features

bullet6 magnetic field channels with 2 types of magnetometers (3 for flux-gate and 3 for search-coil)
bullet4 telluric field channels
bulletAll channels are calibrated
bulletWide frequency range (DC 300) Hz
bulletSatellite synchronization
bulletExcellent temperature stability
bulletLow noise level
bulletSpecial software for real-time data acquisition and visualization
bulletDigital interface
bulletTwo types lightning protection units to select

 

Main applications

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Exploration of gas, oil and other deposits

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Surveying deep Earth conductivity

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Basic regional survey

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Earthquakes monitoring

Composition (left to right)

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3 induction sensors

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Flux-gate sensor

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Lightning protection units

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Electronic unit

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GPS antenna

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Data Registration Unit (optional)
 

WIDE BAND MAGNETOTELLURIC STATION LEMI-418 FOR FIELD SURVEY


Wide band magnetotelluric station LEMI-418 is intended for the study of Earths crust electromagnetic structure in frequency band (DC-300) Hz in field conditions in wide temperature range. The station maintains automated measurement and digitizing of the data from flux-gate and search-coil magnetometers, 4 telluric channels and thermal sensors inside flux-gate sensor and electronic unit. The real time acquisition, recording and visualization of current and previously recorded data are executed in the external PC or in the Data Registration Unit (optional) to which digital data are transferred through serial RS-422 port. The station operation is GPS synchronized.

MAIN TECHNICAL PARAMETERS

1. Flux-gate magnetometer

Full measuring range      70000 nT
Frequency band (DC-0.3) Hz
Noise level in frequency band (0.01-0.3) Hz
at 0.1Hz (10 s)
< 10 pTrms
20 pT/√ Hz
Temperature drift < 0.2 nT/C
Weight of the sensor  with 10 m cable    1.8 kg
 

2. Search-coil magnetometer

Frequency band (0.0001-300) Hz
Shape of transfer function Linear-flat
Corner frequency 1 Hz (or other on demand)
Transfer factor at flat part 200 mV/nT (or other on demand)
Noise level:
  at 0.001 Hz
  at 0.01 Hz  
 
at 1 Hz
  at 100 Hz 
< 100 pT/√Hz
< 10 pT/√Hz
< 0.1 pT/√Hz
< 0.01 pT/√Hz
Weight of the sensor  5.8 kg
 

3. Electric field meter

Frequency band (DC-300) Hz
Measuring ranges (for measuring base 1 m):
  at gain=1
  at gain=10
  at gain=100
  at gain=1000
5000 mV
750 mV
75 mV
7.5 mV
Offset compensation range 7500 mV
Noise level in frequency band (0.01- 0.3) Hz 0.1 μV rms
Non-polarized electrodes own noise in frequency band (0.010.3) Hz < 10 nV
 

4. Electronic unit

Power supply voltage (9-18) V
Power consumption 5 W
Weight of the electronic unit < 4 kg
Operation temperature range minus 20 C to +60 C
Waterproof housing
 

5. Data Registration Unit (optional)

Processor Intel Atom Z510
1.1GHz
USB interface 2 x USB 2.0
Power consumption
Power consumption when display is off
< 12 W
< 7 W

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Last modified: 26-11-2014

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