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Optical Pumping Magnetometer

  • US 20130265042A1
  • Filed: 03/14/2013
  • Published: 10/10/2013
  • Est. Priority Date: 04/06/2012
  • Status: Active Grant
First Claim
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1. A magnetometer comprising:

  • a magnetic sensor, having a glass cell filled with alkali metal gas, that detects a magnetic field using magneto-optical properties of spin-polarized alkali metal;

    a light source that generates frequency-stabilized excitation light introduced to the magnetic sensor;

    a coil, provided in magnetic shield space including the magnetic sensor, that applies a static magnetic field and an RF magnetic field to the magnetic sensor; and

    a signal processing device that lock-in detects a detection signal of light transmitted through the glass cell of the magnetic sensor, controls intensity of the static magnetic field and a frequency of the RF magnetic field generated from the coil based on a lock-in detection output, and obtains a measurement signal reflecting magnetic field intensity of a measurement subject set in the magnetic shield,wherein the magnetic sensor has a structure where a collimator lens that the frequency-stabilized excitation light from the light source is introduced via a polarized wave holding optical fiber, a polarization optical device that transmits the excitation light passed through the collimator lens to the glass cell, and the glass cell, are integrally accommodated in a non-magnetic case.

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