NV Diamond Magnetometry Thermal Drift Compensation
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Solution Overview
Problem
Advanced magnetic detection systems face limitations in ambient conditions and require improvements in size, weight, and power (SWAP) for moderate sensitivity and vector accuracy, especially for applications like imaging.
Innovation Solution
A magnetic detection system utilizing nitrogen vacancy (NV) diamond material with RF and optical excitations to determine a three-dimensional magnetic field by analyzing the spectral positions of a subset of electron spin resonances, which are insensitive to thermal drift, allowing for faster vector sampling and accurate field estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all eight electron spin resonances are used to determine the magnetic field, then measurement precision is improved, but processing time increases and thermal drift affects accuracy
Solution Approach 1:
The patent extracts and utilizes only a subset of four electron spin resonances from the total eight available resonances. By selecting specific resonances that are less susceptible to thermal drift, the system achieves accurate magnetic field measurements without processing all resonances, thereby reducing processing time while maintaining measurement precision.
Solution Approach 2:
The patent changes the selection criteria for electron spin resonances based on their thermal sensitivity parameters. By identifying and using resonances with lower thermal drift characteristics, the system optimizes the balance between measurement accuracy and processing efficiency, eliminating the need to process all eight resonances.
2Measurement precision
If all eight electron spin resonances are analyzed, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the necessary four electron spin resonances from the full set of eight, reducing the complexity of signal processing while maintaining sufficient measurement precision. This selective approach simplifies the computational burden and reduces device complexity.
Solution Approach 2:
The patent applies partial action by using only a subset of the available resonances rather than all eight. This partial utilization of the physical resource achieves the required measurement accuracy without the excessive complexity of processing all resonances.
3Measurement precision
If thermal drift compensation is implemented using all resonances, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent extracts and uses only four electron spin resonances for thermal drift compensation instead of all eight resonances. By selecting resonances with complementary thermal sensitivity characteristics, the system achieves effective thermal compensation with reduced processing time.
4Productivity
If sampling rate is increased for faster vector measurement, then productivity is improved, but thermal drift effects worsen
Solution Approach 1:
The patent changes the selection of electron spin resonances to include those with varying thermal sensitivity parameters. By using a specific combination of four resonances with different thermal characteristics, the system can perform faster sampling while compensating for thermal drift effects, thus maintaining reliability at higher productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves efficient and accurate magnetic field detection in ambient conditions with reduced thermal sensitivity, enabling faster sampling rates and robust performance across varying temperatures.
Implementation Method 1
a radio frequency (RF) excitation source configured to provide RF excitations to the NV diamond material to excite electron spin resonances corresponding to the RF excitations
Implementation Method 2
an optical excitation source configured to provide optical excitation to the NV diamond material; an optical detector configured to receive an optical signal based on light emitted by the NV diamond material, the optical signal having a plurality of intensity changes corresponding respectively to electron spin resonances
Data Source
AI summary
A system for magnetic detection of an external magnetic field is described. The system includes a nitrogen vacancy (NV) diamond material having a plurality of crystallographic axes, a radio frequency (RF) excitation source, an optical excitation source, an optical detector, and a controller. The RF radio frequency excitation source is configured to provide RF excitations to the NV diamond material to excite electron spin resonances corresponding to the RF excitations. The controller determines the spectral position corresponding to some of the electron spin resonances, determines a measured four-dimensional projection of a magnetic field based on the determined spectral positions of a subset of all of the plurality of spin resonances, where the number of spin resonances in the subset is one half of a total number of the spin resonances, and determines an estimated three-dimensional magnetic field based on the measured four-dimensional magnetic field projections.