Methods for detecting a magnetic field acting on a magneto-optical detect center having pulsed excitation

• US 10,466,312 B2
• Filed: 01/30/2017
• Issued: 11/05/2019
• Est. Priority Date: 01/23/2015
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Egan, Laird Nicholas, Coar, David Nelson, Russo, Jon C.
• Primary Examiner(s): Patidar, Jay
• Application Number:
  US15/419,832
• Publication Number:
  US 20170139017A1
• Time in Patent Office: 1,009 Days
• CPC Class Codes: G01N 21/63 optically excited
• CPC Class Codes: G01N 22/00 Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more G01N3/00 - G01N17/00, G01N24/00 take precedence
• CPC Class Codes: G01R 33/032 using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect

Abstract

A method for detecting a magnetic field acting on a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers may include controlling an optical excitation source and an RF excitation source to apply a pulse sequence comprising two optical excitation pulses and two RF excitation pulses to the NV diamond material, receiving a light detection signal from an optical detector based on an optical signal emitted by the NV diamond material due to the pulse sequence, measuring a first value of the light detection signal at a first reference period, the first reference period being before a period of the light detection signal associated with the two RF excitation pulses provided to the NV diamond material, measuring a second value of the light detection signal at a second reference period, the second reference period being after the period of the light detection signal associated with the two RF excitation pulses provided to the NV diamond material, and computing a measurement signal based on the measured first and second values. Such method may further may further comprise measuring a third value of the light detection signal at a signal period, the signal period being after the first reference period and before the second reference period. Such method may further comprise computing the measurement signal based on a difference between the average of the first and second values and the third value.

Claims

1. A method for detecting a magnetic field acting on a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, comprising:

controlling an optical excitation source and an RF excitation source to apply a pulse sequence comprising two optical excitation pulses and two RF excitation pulses to the magneto-optical defect center material;

receiving a light detection signal from an optical detector based on an optical signal emitted by the magneto-optical defect center material due to the pulse sequence;

measuring a first value of the light detection signal at a first reference period, the first reference period being before a period of the light detection signal associated with the two RF excitation pulses provided to the magneto-optical defect center material;

measuring a second value of the light detection signal at a second reference period, the second reference period being after the period of the light detection signal associated with the two RF excitation pulses provided to the magneto-optical defect center material;

computing a measurement signal based on the measured first and second values; and

measuring a third value of the light detection signal at a signal period, the signal period being after the first reference period and before the second reference period.

2. A method for detecting a magnetic field acting on a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, comprising:

controlling an optical excitation source and an RF excitation source to apply a pulse sequence comprising two optical excitation pulses and two RF excitation pulses to the magneto-optical defect center material;

receiving a light detection signal from an optical detector based on an optical signal emitted by the magneto-optical defect center material due to the pulse sequence;

measuring a first value of the light detection signal at a first reference period, the first reference period being before a period of the light detection signal associated with the two RF excitation pulses provided to the magneto-optical defect center material;

measuring a second value of the light detection signal at a second reference period, the second reference period being after the period of the light detection signal associated with the two RF excitation pulses provided to the magneto-optical defect center material;

computing a measurement signal based on the measured first and second values;

measuring a third value of the light detection signal at a signal period, the signal period being after the first reference period and before the second reference period; and

comprising computing the measurement signal based on a difference between the average of the first and second values and the third value.