Apparatus and method for high sensitivity magnetometry measurement and signal processing in a magnetic detection system

摘要

A system for magnetic detection may include a nitrogen vacancy (NV) diamond material, a radio frequency (RF) excitation source, an optical excitation source, an optical detector, a magnetic field generator, and a controller. The controller may control the excitation sources to apply a first pulse sequence. The controller may receive a first light detection signal due to the first pulse sequence, measure first and second values of the first light detection signal at first and second reference periods, and compute a first measurement. The controller may further control the excitation sources to apply a second pulse sequence, receive a second light detection signal due to the second pulse sequence, measure first and second values of the second light detection signal at first and second reference periods, and compute a second measurement. The first and second measurements may be based on high and low resonance frequencies of the NV diamond material.

主权项

1. A system for magnetic detection, comprising:
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; a magnetic field generator configured to generate a magnetic field applied to the NV diamond material; and a controller configured to: control the optical excitation source and the RF excitation source to apply a first pulse sequence comprising two optical excitation pulses and two RF excitation pulses to the NV diamond material; receive a first light detection signal from the optical detector based on an optical signal emitted by the NV diamond material due to the first pulse sequence; measure a first value of the first light detection signal at a first reference period, the first reference period being before a period of the first light detection signal associated with the two RF excitation pulses of the first pulse sequence provided to the NV diamond material; measure a second value of the first light detection signal at a second reference period, the second reference period being after the period of the first light detection signal associated with the two RF excitation pulses of the first pulse sequence provided to the NV diamond material; compute a first measurement based on the measured first and second values of the first light detection signal; control the optical excitation source and the RF excitation source to apply a second pulse sequence comprising two optical excitation pulses and two RF excitation pulses to the NV diamond material; receive a second light detection signal from the optical detector based on an optical signal emitted by the NV diamond material due to the second pulse sequence; measure a first value of the second light detection signal at a first reference period, the first reference period being before a period of the second light detection signal associated with the two RF excitation pulses of the second pulse sequence provided to the NV diamond material; measure a second value of the second light detection signal at a second reference period, the second reference period being after the period of the second light detection signal associated with the two RF excitation pulses of the second pulse sequence provided to the NV diamond material; and compute a second measurement based on the measured first and second values of the second light detection signal, wherein the first measurement is based on a high resonance frequency of the NV diamond material, and wherein the second measurement is based on a low resonance frequency of the NV diamond material.