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Efficient thermal drift compensation in DNV vector magnetometry

  • US 10,359,479 B2
  • Filed: 02/20/2017
  • Issued: 07/23/2019
  • Est. Priority Date: 02/20/2017
  • Status: Active Grant
First Claim
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1. A system for magnetic detection of an external magnetic field, comprising:

  • a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, the diamond material having a plurality of crystallographic axes each directed in different directions, the NV centers each corresponding to a respective one of the plurality of crystallographic axes;

    a radio frequency (RF) excitation source configured to provide RF excitations to the NV diamond material to excite electron spin resonances corresponding to the RF excitations, each crystallographic axis corresponding to a different electron spin resonance;

    an optical excitation source configured to provide optical excitation to the NV diamond material;

    an optical detector configured to receive an optical signal based on light emitted by the NV diamond material, the optical signal having a plurality of intensity changes corresponding respectively to electron spin resonances of the NV centers; and

    a controller configured to;

    receive a light detection signal from the optical detector based on the optical signal;

    determine the spectral position corresponding to some of the electron spin resonances based on the light detection signal;

    determine a measured four-dimensional projection of a magnetic field based on the determined spectral positions of a subset of all of the plurality of spin resonances, where the number of spin resonances in the subset is one half of a total number of the spin resonances; and

    determine an estimated three-dimensional magnetic field based on the measured four-dimensional magnetic field projections.

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