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Home Sensors Long-Period Magnetotelluric Station LEMI-417

Long-Period Magnetotelluric Station LEMI-417

Description

LEMI-417 digital seven-component magnetotelluric station (MTS) (three magnetic + three electric channels) is intended for the measurement of natural magnetic and electric field components and their variations in laboratory and field conditions.

The magnetometer is produced on the base of flux-gate sensor, all three components of which are implemented in the same thermostable housing. The electrometer has four channels with high input resistance and offset compensation, which can operate with any type of measuring electrodes. The electronic unit allows acquisition, processing and storage of data about magnetic and electric fields variations in internal memory and their transmission to the computer via RS-232 interface. Built-in GPS receiver provides satellite synchronization of the internal clock and the coordinates of the MTS location. MTS operation algorithm allows organizing both autonomous and synchronous operation of a set of the MTS installed at the studied area. Low magnetism of all components allows the magnetic sensor operating conveniently close to the electronic unit.

Technical specification

  • Magnetic variations measuring ranges along each component: –––––––––––––––– ± 68 000 nT
  • Resolution –––––––––––––––––––––––––––––––––––––––––––––––––––––––––– 10 pT
  • Noise level at analog output at 1 Hz ––––––––––––––––––––––––––––––––––––– < 7 pT
  • Long-term zero drift –––––––––––––––––––––––––––––––––––––––––––––––––– < ± 5 nT/year
  • Temperature drift –––––––––––––––––––––––––––––––––––––––––––––––––––– < 0.2 nT/°C
  • Transformation factor linearity error ––––––––––––––––––––––––––––––––––––– < 0.01%
  • Components orthogonality error –––––––––––––––––––––––––––––––––––––––– < 30 min of arc
  • Electric voltage total measurement range –––––––––––––––––––––––––––––––– ±240 mV
  • Resolution of the electric channel ––––––––––––––––––––––––––––––––––––––– 10 nV
  • Input resistance ––––––––––––––––––––––––––––––––––––––––––––––––––––– > 10 GOhm
  • Measurement time ––––––––––––––––––––––––––––––––––––––––––––––––––– 1 s
  • Internal FLASH-memory volume –––––––––––––––––––––––––––––––––––––––– 512MB - 2 GB
  • Operating temperature range –––––––––––––––––––––––––––––––––––––––––– minus 20 to +60 °C
  • Power supply source ––––––––––––––––––––––––––––––––––––––––––––––––– built-in battery 12 V
  • Power consumption –––––––––––––––––––––––––––––––––––––––––––––––––– 0.9 W
  • Weight of electronic unit with magnetic sensor––––––––––––––––––––––––––––– 4 kg
  • Length of connecting cable between magnetic sensor  and electronic unit up to –– 10 m

Optional: Cu-CuSO4 electrodes (matched pairs).

Innovative Aspect and Main Advantages

LEMI-417 major advantages are very low temporal drift and high accuracy of measurements, what makes it especially efficient for deep sounding application. LEMI-417 is high sensitive device, which has unique low power consumption – 1 W at the maintenance of main technical characteristics at the level of the best word standards. The station has waterproof housing and can autonomously operate during 6 months and longer in wide tem-perature range.

Product name and
manufac-turer
Magnetic channel
noise
Power
consumption
LEMI-417, LC ISR, Ukraine ~ 7 pTrms. in band (0.03-1)Hz < 1 W;
battery 12-3+6V
Magnetotelluric System NIMS,
Narod Geo-physics LTD, Canada
14 pТ/√(Hz) at 1 Hz;
100 pТ/√(Hz) at 0.01Hz
1.3 W;
V8 Phoenix, Canada 0.06 pТ/√(Hz) 15 W; 12 V

Areas of Application

LEMI-417 is used for deep sounding of the Earth’s crust and the determination of vertical resistivity profile parameters down to 400 km with the purpose of mineral prospecting and search of earthquake precursors.


Fig. 1 Magnetotelluric station LEMI-417.


Fig. 2 Main window of LEMI-417.exe program.

Stage of Development

LEMI-417 is already on the market. LC ISR produces them for individual orders in the amount of 50-100 pieces per year.

Contact Details

Valery Korepanov
Organization: Lviv Center of Institute of Space Research NASU-NSAU
Address: 5A, Naukova str. Lviv-060, 79000, Ukraine
(38-0322) 639163
This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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