Apparatus and method for recovery of three dimensional magnetic field from a magnetic detection system

• US 10,408,889 B2
• Filed: 01/06/2017
• Issued: 09/10/2019
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Kaup, Peter G., Manickam, Arul
• Primary Examiner(s): Aurora, Reena
• Application Number:
  US15/400,794
• Publication Number:
  US 20170115361A1
• Time in Patent Office: 977 Days
• CPC Class Codes: G01R 33/032 using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect

Abstract

A system for magnetic detection of an external magnetic field is disclosed. The system includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a magnetic field generator that generates a magnetic field, a radio frequency (RF) excitation source that provides RF excitation, an optical excitation source that provides optical excitation, an optical detector that receives an optical signal emitted by the NV diamond material, and a controller. The controller is configured to calculate a control magnetic field, control the magnetic field generator to generate the control magnetic field, receive a light detection signal from the optical detector based on the optical signal due to the sum of the generated control magnetic field and the external magnetic field, store measurement data based on the received light detection signal, and calculate a vector of the external magnetic field based on the stored measurement data.

Claims

1. A system for magnetic detection of an external magnetic field, comprising:

a magneto-optical defect center material comprising a plurality of magneto-optical defect centers;

a magnetic field generator configured to generate a magnetic field;

a radio frequency (RF) excitation source configured to provide RF excitation to the magneto-optical defect center material;

an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation; and

a controller configured to;

calculate a control magnetic field that separates the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material;

control the magnetic field generator to generate the control magnetic field;

receive a light detection signal from the optical detector based on the optical signal emitted by the magneto-optical defect center material due to the sum of the generated control magnetic field and the external magnetic field;

store measurement data based on the received light detection signal; and

calculate a vector of the external magnetic field based on the stored measurement data.

2. The system of claim 1, wherein the controller calculates a control magnetic field that equally separates the plurality of reduced responses.

3. The system of claim 1, wherein the controller calculates a control magnetic field that maximally separates the plurality of reduced responses.

4. The system of claim 1, wherein the controller is further configured to calculate an orientation of the magneto-optical defect center material.

5. The system of claim 4, wherein the controller is configured to calculate the orientation of the magneto-optical defect center material based on a rotation and/or reflection of a standard orientation of the magneto-optical defect center material.

6. The system of claim 1, wherein the controller is configured to assign a plurality of sign values to the measurement data such that a sum of the measurement data approaches zero.

7. The system of claim 6, wherein the controller is configured to assign a positive sign value to the largest and smallest measurement data, and a negative sign value to the second-largest and third-largest measurement data.

8. The system of claim 6, wherein the controller is configured to assign a positive sign value to the largest measurement data, and a negative sign value to the second-largest, third-largest, and smallest measurement data.

9. The system of claim 1, further comprising a pivot assembly, wherein the magnetic field generator is affixed to the pivot assembly, the pivot assembly is configured to position the magnetic field generator to a predetermined orientation such that the magnetic field generator generates the calculated control magnetic field, and the controller is further configured to control the pivot assembly.

10. The system of claim 1, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.

11. A system for magnetic detection of an external magnetic field, comprising:

a magneto-optical defect center material comprising a plurality of magneto-optical defect centers;

a radio frequency (RF) excitation source configured to provide RF excitation to the magneto-optical defect center material;

an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation;

a magnetic field generator configured to generate a control magnetic field, the control magnetic field being configured to separate the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material; and

a controller configured to;

receive a light detection signal from the optical detector based on the optical signal emitted by the magneto-optical defect center material due to the sum of the control magnetic field and the external magnetic field;

store measurement data based on the received light detection signal; and

calculate a vector of the external magnetic field based on the stored measurement data.

12. The system of claim 11, wherein the control magnetic field is configured to equally separate the plurality of reduced responses.

13. The system of claim 11, wherein the control magnetic field is configured to maximally separate the plurality of reduced responses.

14. The system of claim 11, wherein the controller is further configured to calculate an orientation of the magneto-optical defect center material.

15. The system of claim 14, wherein the controller is configured to calculate the orientation of the magneto-optical defect center material based on a rotation and/or reflection of a standard orientation of the magneto-optical defect center material.

16. The system of claim 11, wherein the magnetic field generator is a permanent magnet.

17. The system of claim 16, further comprising a pivot assembly, wherein the magnetic field generator is affixed to the pivot assembly, the pivot assembly is configured to position the magnetic field generator to a predetermined orientation such that the magnetic field generator generates the control magnetic field, and the controller is further configured to control the pivot assembly.

18. The system of claim 11, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.

19. A system for magnetic detection of an external magnetic field, comprising:

a magneto-optical defect center material comprising a plurality of magneto-optical defect centers;

a radio frequency (RF) excitation source configured to provide RF excitation to the magneto-optical defect center material;

an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation;

a magnetic field generator affixed to a pivot assembly, the pivot assembly being configured to position the magnetic field generator to a predetermined orientation such that the magnetic field generator generates a control magnetic field that separates the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material; and

a controller configured to;

control the pivot assembly to position the magnetic field generator to the predetermined orientation to generate the control magnetic field;

receive a light detection signal from the optical detector based on the optical signal emitted by the magneto-optical defect center material due to the sum of the control magnetic field and the external magnetic field;

store measurement data based on the received light detection signal; and

calculate a vector of the external magnetic field based on the stored measurement data.

20. The system of claim 19, wherein the control magnetic field is configured to equally separate the plurality of reduced responses.

21. The system of claim 19, wherein the control magnetic field is configured to maximally separate the plurality of reduced responses.

22. The system of claim 19, wherein the controller is configured to calculate an orientation of the magneto-optical defect center material based on a rotation and/or reflection of a standard orientation of the magneto-optical defect center material.

23. The system of claim 19, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.

24. A system for magnetic detection, comprising:

a magneto-optical defect center material comprising a plurality of NV magneto-optical defect centers;

a magnetic field generator configured to generate a magnetic field;

a radio frequency (RF) excitation source configured to provide RF excitation to the magneto-optical defect center material;

an optical excitation source configured to provide optical excitation to the magneto-optical defect center material;

an optical detector configured to receive an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation; and

a controller configured to;

calculate a control magnetic field that separates the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material; and

control the magnetic field generator to generate the control magnetic field.

25. The system of claim 24, wherein the controller calculates a control magnetic field that equally separates the plurality of reduced responses.

26. The system of claim 24, wherein the controller calculates a control magnetic field that maximally separates the plurality of reduced responses.

27. The system of claim 24, wherein the controller is further configured to:

receive a light detection signal from the optical detector based on the optical signal emitted by the magneto-optical defect center material due to the sum of the generated control magnetic field and the external magnetic field;

store measurement data based on the received light detection signal; and

calculate a vector of the external magnetic field based on the stored measurement data.

28. The system of claim 24, further comprising a pivot assembly, wherein the magnetic field generator is affixed to the pivot assembly, the pivot assembly is configured to position the magnetic field generator to a predetermined orientation such that the magnetic field generator generates the control magnetic field, and the controller is further configured to control the pivot assembly.

29. The system of claim 24, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.

30. A method for detecting an external magnetic field applied on a magneto-optical defect center material comprising a plurality of NV centers, comprising:

providing radio frequency (RF) excitation to the magneto-optical defect center material;

providing optical excitation to the magneto-optical defect center material;

detecting an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation;

calculating a control magnetic field that separates the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material;

applying the control magnetic field to the magneto-optical defect center material;

receiving a light detection signal based on the optical signal emitted by the magneto-optical defect center material due to the sum of the generated control magnetic field and the external magnetic field;

storing measurement data based on the received light detection signal; and

calculating a vector of the external magnetic field based on the stored measurement data.

31. The method of claim 30, wherein the control magnetic field separates the plurality of reduced responses.

32. The method of claim 30, wherein the control magnetic field maximally separates the plurality of reduced responses.

33. The method of claim 30, further comprising calculating an orientation of the magneto-optical defect center material.

34. The method of claim 33, wherein calculating the orientation of the magneto-optical defect center material is based on a rotation and/or reflection of a standard orientation of the magneto-optical defect center material.

35. The method of claim 30, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.

36. A system for detecting an external magnetic field acting on a magneto-optical defect center diamond material comprising a plurality of NV magneto-optical defect centers, comprising:

means for providing radio frequency (RF) excitation to the magneto-optical defect center material;

means for providing optical excitation to the magneto-optical defect center material;

means for detecting an optical signal emitted by the magneto-optical defect center material, the optical signal being a fluorescence intensity having a plurality of reduced responses across a frequency range of the RF excitation;

means for generating a control magnetic field that separates the plurality of reduced responses in the optical signal emitted by the magneto-optical defect center material;

means for receiving a light detection signal based on the optical signal emitted by the magneto-optical defect center material due to the sum of the generated control magnetic field and the external magnetic field;

means for storing measurement data based on the received light detection signal; and

means for calculating a vector of the external magnetic field based on the stored measurement data.

37. The system of claim 36, further comprising means for calculating an orientation of the magneto-optical defect center material.

38. The system of claim 36, wherein the magneto-optical defect center material is a nitrogen vacancy (NV) diamond material.