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US 12,656,426 B2Granted
Quantum magnetic sensing technologies, systems and methods using the same
AssigneeBattelle Memorial Institute
InventorsSteven M. Risser, Andy F. Kirby, Richard J. Higgins, Anthony F. George
Life of this patent
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Abstract
In an approach to measuring a magnetic field of a sample, a system includes an optical fiber comprising a first end and a second end, the optical fiber having a core; and a nitrogen vacancy (NV) diamond sensor; where the first end of the optical fiber is configured to receive excitation light from an optical excitation source; and the NV diamond sensor is coupled to the second end of the optical fiber with an optical matching material, the optical matching material configured to optically match the NV diamond sensor to the core of the optical fiber.
Claims17
A system for measuring a magnetic field of a sample, the system comprising:
- an optical fiber comprising a first end and a second end, the optical fiber having a core;
- and
- a nitrogen vacancy (NV) diamond sensor;
- wherein:
- the first end of the optical fiber is configured to receive excitation light from an optical excitation source;
- and
- the NV diamond sensor is coupled to the second end of the optical fiber with an optical matching material, the optical matching material configured to optically match the NV diamond sensor to the core of the optical fiber;
- wherein:
- the core of the optical fiber has an optical index Ncore, the NV diamond sensor has an optical index Nd, and the optical matching material has an optical index Nom;
- responsive to the Nd is greater than the Ncore, select the optical matching material with the Nom in a range of Ncore+0.2 (Nd−Ncore)<Nom<Ncore+0.8 (Nd−Ncore);
- and
- responsive to the Nd is less than the Ncore, select the optical matching material with the Nom in the range of Nd+0.2 (Ncore−Nd)<Nom<Nd+0.8 (Ncore−Nd).
9 more elements
A system for measuring a magnetic field of a sample, the system comprising:
- a nitrogen vacancy (NV) diamond sensor;
- an optical excitation source optically coupled to the NV diamond sensor;
- wherein:
- the optical excitation source is optically coupled to the NV diamond sensor with an optical matching material;
- and
- the optical matching material has a first optical index that differs from a second optical index of the NV diamond sensor by less than five percent;
- an RF source configured to produce RF field at or proximate to the NV diamond sensor;
- an optical detector configured to receive signal light produced by the NV diamond sensor in response to application of excitation light to the NV diamond sensor;
- and
- a controller configured to perform measurement operations, the measurement operations comprising:
- cause the optical detector to:
- receive the signal light produced by the NV diamond sensor in response to the excitation light produced by the optical excitation source;
- determine a first number of photons P1 with a first wavelength λ2 in the signal light that correspond to photons emitted from a first excited state ms=+/−1 state to a first ground ms=+/−1 state in the NV diamond sensor in an absence of an RF field produced by the RF source;
- determine a second number of photons P2 with the first wavelength λ2 in the signal light that correspond to the photons emitted from the first excited state ms=+/−1 state to the first ground ms=+/−1 state in the NV diamond sensor following application of the RF field produced by the RF source;
- and
- determine a component of an external magnetic field proximate the NV diamond sensor using a ratio of the first number of the photons P1 and the second number of photons P2.
13 more elements
A system for measuring a magnetic field of a sample, the system comprising:
- a nitrogen vacancy (NV) diamond sensor;
- an optical excitation source optically coupled to NV diamond sensor,
- wherein:
- the optical excitation source is optically coupled to the NV diamond sensor with an optical matching material;
- and
- the optical matching material has a first optical index that differs from a second optical index of the NV diamond sensor by less than five percent;
- an RF source configured to produce RF field at or proximate to the NV diamond sensor;
- an optical detector configured to receive signal light produced by the NV diamond sensor in response to application of excitation light to the NV diamond sensor;
- and
- a controller configured to perform measurement operations, the measurement operations comprising:
- cause the optical detector to:
- receive the signal light produced by the NV diamond sensor in response to the excitation light produced by the optical excitation source;
- measure the signal light during a pulsed optically detected magnetic resonance (ODMR) measurement;
- and
- determine a component of an external magnetic field proximate the NV diamond sensor based on the ODMR measurement.
12 more elements
A magnetometer comprising:
- a photonic sensor;
- a microwave source;
- an NV diamond;
- and
- a light source, wherein:
- the NV diamond is a magnetometry medium;
- the magnetometer is stable at room temperature;
- the light source is coupled to the NV diamond with an optical matching material;
- and
- the optical matching material has a first optical index that differs from a second optical index of the NV diamond by less than five percent.
7 more elements
Dependencies are inferred from the claim text.