DNV magnetic field detector

Patent metadata

Field	Value
Publication number	US-9910105-B2
Application number	US-201615179957-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Mar 20, 2014
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

First claim

What is claimed is:

1. A system for magnetic detection, comprising:
a magneto-optical defect center sensor 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, wherein the optical signal is based on hyperfine states of the magneto-optical defect center material;
a controller configured to detect a gradient of the optical signal based on the hyperfine states emitted by the magneto-optical defect center material; and
a reflector positioned about the magneto-optical defect center material to reflect a portion of light emitted from the magneto-optical defect center material.

2. The system of claim 1 , wherein the magneto-optical defect center sensor further comprises:
a magnetic field generator configured to generate a magnetic field;
wherein the controller is further configured to:
control the magnetic field generator to apply a time varying magnetic field at the magneto-optical defect center material;
determine a magnitude and direction of the magnetic field at the magneto-optical defect center material based on a received light detection signal from the optical detector; and
determine a magnetic vector anomaly due to an object based on the determined magnitude and direction of the magnetic field according to a frequency dependent attenuation of the time varying magnetic field.

3. The system of claim 1 , wherein the magneto-optical defect center sensor further comprises:
a magnetic field generator comprising at least two magnetic field generators including a first magnetic field generator configured to generate a first magnetic field and a second magnetic field generator configured to generate a second magnetic field;
wherein the controller is further configured to:
modulate a first code packet and control the first magnetic field generator to apply a first time varying magnetic field at the magneto-optical defect center material based on the modulated first code packet, and
modulate a second code packet and control the second magnetic field generator to apply a second time varying magnetic field at the magneto-optical defect center material based on the modulated second code packet, wherein the first code packet and the second code packet are binary sequences which have a low cross correlation with each other, and each of the binary sequences has a good autocorrelation.

4. The system of claim 3 , wherein a direction of the first time varying magnetic field at the magneto-optical defect center material is different from a direction of the second time varying magnetic field at the magneto-optical defect center material.

5. The system of claim 3 , wherein the controller is further configured to:
receive first light detection signals from the optical detector based on the optical signal emitted by the magneto-optical defect center material based on the first code packet transmitted to the magneto-optical defect center material, and receive second light detection signals from the optical detector based on the optical signal emitted by the magneto-optical defect center material based on the second code packet transmitted to the magneto-optical defect center material simultaneous with the first code packet being transmitted to the magneto-optical defect center material;
apply matched filters to the received first and second light detection signals to demodulate the first and second code packets;
determine a magnitude and direction of the first magnetic field and the second magnetic field at the magneto-optical defect center material based on the demodulated first and second code packets; and
determine a magnetic vector anomaly based on the determined magnitude and direction of the first magnetic field and the second magnetic field.

6. The system of claim 3 , wherein the first and second code packets are modulated by continuous phase modulation.

7. The system of claim 3 , wherein the first and second code packets are modulated by MSK frequency modulation.

8. The system of claim 3 , wherein the controller is further configured to control the RF excitation source and the optical excitation source to provide a sequence of pulses to the magneto-optical defect center material.

9. The system of claim 1 , further comprising:
a transmitting device comprising:
a first processor configured to transmit data to a transmitter; and
the transmitter, wherein the transmitter is configured to transmit the data via a magnetic field.

10. The system of claim 9 , further comprising:
a receiving device comprising:
the magneto-optical defect center sensor configured to detect the magnetic field; and
a second processor configured to decipher the data from the detected magnetic field.

11. The system of claim 10 , wherein the first processor is further configured to:
receive a first data stream comprising the data; and
interleave the data into a plurality of second data streams, and
wherein the transmitter is configured to transmit each of the second data streams on one of a plurality of channels.

12. The system of claim 11 , wherein each of the plurality of channels comprises one of a plurality of magnetic fields.

13. The system of claim 12 , wherein each of the plurality of magnetic fields is orthogonal to one another.

14. The system of claim 11 , wherein the magneto-optical defect center sensor is configured to detect the magnetic field in a plurality of directions.

15. The system of claim 14 , wherein the plurality of directions are tetrahedrally arranged.

16. The system of claim 14 , wherein the second processor is configured to:
receive a plurality of signals from the magneto-optical defect center sensor, wherein each of the plurality of signals corresponds to one of the plurality of directions;
decipher each of the plurality of second data streams from the plurality of signals; and
de-interleave the plurality of second data streams to determine the data.

17. The system of claim 11 , wherein to transmit the data via the magnetic field, the transmitter is configured to transmit two data streams via two magnetic fields, and wherein each of the two data streams corresponds to one of the two magnetic fields.

18. The system of claim 11 , wherein to transmit the data via a magnetic field, the transmitter is configured to transmit three data streams via three magnetic fields, wherein each of the three data streams corresponds to one of the three magnetic fields.

19. The system of claim 11 , wherein the first processor is further configured to:
receive a first data stream comprising the data;
interleave the data into a plurality of second data streams; and
append a synchronization sequence to each of the plurality of second data streams to form a plurality of third data streams, and
wherein the transmitter is configured to transmit each of the third data streams on one of a plurality of channels.

20. The system of claim 19 , wherein the magneto-optical defect center sensor is configured to detect the magnetic field in a plurality of directions, wherein the plurality of directions are orthogonal to one another; and
wherein the second processor is configured to:
receive a plurality of signa

Assignees

• Lockheed Corp

Inventors

• Boesch Brian P
• Bruce Gregory Scott
• Cammerata Jeff D
• COAR David Nelson
• Egan Laird Nicholas
• Fisk Bryan Neal
• Lew Wilbur
• Manickam Arul
• SEKELSKY Stephen Michael
• Stetson Jr John B
• Kaup Peter G
• MILLER Julie Lynne
• Russo Jon C
• Stockman Emanuel Solomon
• Meyer Thomas J
• Krause James Michael
• Mabry James P
• Pepa Elton

Classifications

• B64U2201/10

  autonomous, i.e. by navigating independently from ground or air stations, e.g. by using inertial navigation systems [INS] · CPC title

• G05D1/0088

  characterized by the autonomous decision making process, e.g. artificial intelligence, predefined behaviours (using knowledge based models G06N5/00) · CPC title

• G01R33/032 Primary

  using magneto-optic devices, e.g. Faraday {or Cotton-Mouton effect} · CPC title

• G01C21/00

  Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 (measuring distance traversed on the ground by a vehicle G01C22/00; control of position, course, altitude or attitude of vehicles G05D1/00; traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968) · CPC title

• B64C2201/141

  Operations & Transport · mapped topic