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Home Sensors Intermagnet 1-second standard flux-gate magnetometer LEMI-036

Intermagnet 1-second standard flux-gate magnetometer LEMI-036

Description

Fluxgate magnetometer (FGM) LEMI-036 was specially developed for the super sensitive measurements of 3 components of Earth magnetic field induction and their variations in accordance with new 1-second INTERMAGNET standard. The signals with periods from 1 to 100.000 seconds and more may be collected with reasonable error. In order to realize this design the major attention was paid to such principal FGM characteristics and parameters as frequency response and sampling synchronization accuracy as well as thermal and temporal stability and noise level. To fulfil such mutually contradictory requirements as speed of response and deep suppression of industrial noise, the specific combination of analogue and digital filters was realized in this instrument. The magnetic sensor of flux-gate type, which mainly determines magnetometer stability and noise level, was manufactured with high-tech glass-ceramics having close to zero thermal expansion factor using well-proved technology, which implements recent findings in the excitation circuit construction and operation mode. Using best available voltage references and passive components provides excellent stability of the FGM electronics.

This FGM can be installed into empty boreholes with a diameter 0.2 m and more. The fluxgate sensor is fixed at the suspended platform in order to automatically keep the horizontal level. The instrument operates with an external computer, which controls magnetometer operation and stores acquired data. Communication between a computer and LEMI-036 is provided by the RS-422 digital interface. The instrument has GPS receiver for data sampling synchronization and FGM location co-ordinates determination.

Main technical parameters

  • Measured range of magnetic field variations(with analogue outputs available) ..... ± 4000 nT
  • Automated offset compensation band along each magnetic component ............ ± 70000 nT
  • Resolution along each component:
    • in the 1-second and 1-minute data files .................................................... 0.01 nT
    • in the 0.1-second file .............................................................................. 0.001 nT
  • Temperature drift .......................................................................................... < 0.5 nT/°C
  • Frequency band ........................................................................................... DC-3.5 Hz
  • Output noise in frequency band (0.01 – 1) Hz ................................................. < 0.01 nT rms
  • Magnetic sensor components orthogonality ................................................... < 30 min of arc
  • Range of sensor tilt compensation ................................................................ < 8 deg of arc
  • Sampling rate
    • at the magnetometer digital output .......................................................... 10 per second
    • after PC software digital filtration ............................................................. 1 per second, 1 per minute
  • Error of synchronization with UTC time .......................................................... < 10 ms
  • Digital output ............................................................................................... RS 422
  • Analogue outputs ......................................................................................... Single-ended,  ± 4V
  • Operating temperature range ......................................................................... Minus 5 to +40°C
  • Power supply .............................................................................................. 12+3-2 V
  • Power consumption ..................................................................................... < 4 W
  • Physical dimensions
    • sensor .................................................................................................. Ø160 x 360 mm
    • electronic unit ....................................................................................... 402 x 160 x 91 mm
  • Weight:
    • Sensor with cable .................................................................................. 6.9 kg
    • Electronic unit with power supply/interface test cable ................................3.9 kg
    • GPS antenna with test cable and support ................................................ 0.8 kg
  • Cables: Sensor cable up to .......................................................................... 50 m

Innovative Aspect and Main Advantages

  • High resolution and precision
  • Low noise level
  • Guaranteed low time shift of the acquired data
  • Low temperature offset
  • Convenience of installation and service
  • Automatic operation control
  • Satellite synchronization
  • RS - 422 output
  • IAGA2002 formatted 1-sec and 1-min data
  • Deep suppression of the power mains interference
  • 3 years operational guarantee

Areas of Application

Fluxgate magnetometer (FGM) LEMI-036 was specially developed for the super sensitive measurements of 3 components of Earth magnetic field induction and their variations in accordance with new 1-second INTERMAGNET standard.


LEMI-036 magnetometer

Stage of Development

Magnetometer is already on the market, and Lviv Center of Institute of Space Research(LC ISR) can produce 200-300 magnetometers 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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