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WIDE BAND MAGNETOTELLURIC STATION FOR FIELD
SURVEY LEMI-423
Main
features:
 |
3 AC magnetic field sensors
|
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2 telluric field channels |
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Wide frequency range
(0.0001…1000) Hz |
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Satellite synchronization |
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Excellent temperature stability |
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Low noise level |
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All sensors are calibrated |
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Special software for real-time data
acquisition and visualization |
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Digital USB interface |
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SD card 32GB |
|
Two types of lightning protection
units to select |
|
Main applications:
|
Exploration of gas, oil and
other deposits |
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Surveying deep Earth
conductivity |
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Basic regional survey |
Composition (left to right):
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3 induction sensors
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Electronic unit
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Lightning protection units
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GPS antenna |
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Non-polarizing electrodes
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Wide band
magnetotelluric station LEMI-423 is intended for the study of natural
electromagnetic fluctuations in field conditions in wide temperature range.
The station registers and digitizes automatically the data from 3
search-coil magnetometers and 2 electric channels. The electric channels include lightning
protection unit, one of two its constructions differing by the connectors
type for electric lines connection (see photo) may be selected. The real
time acquisition, recording and visualization of current and previously
recorded data are executed in the external PC to which digital data are
transferred through USB port. The station operation is GPS synchronized. |
MAIN
TECHNICAL PARAMETERS
|
1. Search-coil
magnetometer |
| Frequency band |
(0.0001-1000)
Hz |
| Shape of transfer function |
Linear-flat |
| Corner frequency |
1 Hz |
| Transfer factor at flat part (differential) |
200 mV/nT |
Noise level:
at 0.001 Hz
at 0.01 Hz
at 1 Hz
at 300 Hz |
< 100 pT/√Hz
< 10 pT/√Hz
< 0.1 pT/√Hz
< 0.01 pT/√Hz |
| Weight of one sensor |
5,8
kg |
|
2. Electric field meter |
| Frequency band |
(DC-1000) Hz |
Measuring ranges (for measuring base 1 m):
at gain=1 |
± 600 mV |
| Noise level in frequency band (0.01- 0.3)
Hz |
35 nV/√Hz |
| Non-polarized electrodes (optional) own
noise in frequency band (0.01…0.3) Hz |
< 10nV/√Hz |
| 3. Electronic
unit |
| Sample rate per second |
1, 250, 500, 1k, 2k, 4k |
| Power supply voltage |
(9-18) V |
| Power consumption (with three sensors) |
1.7 W |
| Weight |
2 kg |
| Operation temperature range |
minus 20° to +60°C |
| Waterproof housing |
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