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Apparatus with ambient magnetic field correction

  • US 8,525,516 B2
  • Filed: 12/10/2008
  • Issued: 09/03/2013
  • Est. Priority Date: 12/11/2007
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a cell filled with a gas;

    an exciter of the gas to make atoms of the gas jump to a higher energy level;

    a detector to collect a light signal passing through the gas;

    means for applying an essentially static magnetic field and two oscillating magnetic fields directed perpendicular to each other; and

    means for controlling the means for applying the essentially static magnetic field and the two oscillating magnetic fields in order to regulate in direction and in intensity the essentially static magnetic field, and cause a reduction in an amplitude of spectral lines of the light signal passing through the gas among frequencies (Ω

    /2π

    , ω

    /2π

    ) of the two oscillating magnetic fields, a sum (ω



    )/2π

    ) of said frequencies and a difference (ω



    Ω

    )/2π

    ) of said frequencies.

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