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Home Sensors 3-component 1-second observatory magnetometer LEMI-025 to measure Earth's magnetic field

3-component 1-second observatory magnetometer LEMI-025 to measure Earth's magnetic field

Description

Fluxgate magnetometer LEMI-025 was specially developed for the super stable 3-component measurements of Earth magnetic field induction and their variations in accordance with new 1-second INTERMAGNET standard. In order to realize this design major attention was paid to frequency response and sampling synchronization accuracy as well as thermal and temporal stability and noise level for magnetic channels. In order 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 using well-proved technology on the base of marble and quartz combination. The rotating sensor support has two bubble levels and levelling facilities to provide proper orientation of its components at the selected place. The instrument is intended for operation in the geomagnetic observatory conditions and is both accumulating data into a removable Compact flash memory card up to 2 GB and/or transmitting to the external PC for storing of the acquired data.


LEMI-025 magnetometer

Technical specification

  • Measured range of magnetic field variations ............................................. ± 4000 nT
  • Offset compensation band along each magnetic component ...................... ± 70 000 nT
  • Resolution along each component:
    • at the display, 1-second and 1-minute data files .................................. 0.01 nT
    • at 0.1-second file and Flash card data ................................................ 0.001 nT
  • Temperature drift .................................................................................... < 0.2 nT/°C
  • Noise level at 1 Hz ................................................................................. < 10 pT rms
  • Components orthogonality error ............................................................... < 30 min of arc
  • Components orthogonality error after calibration ........................................ < 2 min of arc
  • Sample rate
    • at the magnetometer digital output and FLASH card ............................ 10 per second
    • after PC software digital filtration ........................................................ 1 per second or 1 per minute
  • Frequency band for 10 per second data output ........................................... DC – 3.5 Hz
  • Volume of the removable Compact FLASH memory card (CF FAT16) ............ ≤ 2 GB
  • Digital output .......................................................................................... RS 232
  • GPS timing and coordinates determination
    • Operating temperature range .............................................................. minus 10 to +50° C
    • Power supply ................................................................................... 12+3-2V
    • Power consumption .......................................................................... < 4 W
  • Weight
    • sensor with 10 m cable ..................................................................... 3.3 kg
    • electronic unit with cables ................................................................. 3.8 kg
    • GPS antenna with 15 m cable ............................................................ 0.7 kg

Innovative Aspect and Main Advantages

  • High resolution and precision
  • Low noise level
  • Low time shift of the acquired data
  • Low temperature offset
  • Convenience of installation and service
  • Automatic operation control
  • 2 GB removable Flash card
  • Satellite synchronization
  • RS - 232 output
  • IAGA2002 formatted 1-sec and 1-min data
  • Deep suppression of the power mains interference
  • 18 months operational guarantee

Areas of Application

Fluxgate magnetometer LEMI-025 for the super stable measurements of 3-component Earth magnetic field and its variations in accordance with new 1-second INTERMAGNET standard in the geomagnetic observatory conditions. The only commercially available instrument of this class. Used in space on satellites.

Magnetometer LEMI-025 in Conrad Observatory, Austria

Stage of Development

Magnetometer is already for the market

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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