Ramsey Vector Magnetometry Using Defect Center Segmentation
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Solution Overview
Problem
Advanced magnetic imaging systems often require operation in restricted conditions like high vacuum or cryogenic temperatures, limiting their applicability to industrial and scientific applications that need operation in ambient conditions, and they suffer from sensitivity loss in multi-axis measurements.
Innovation Solution
A system utilizing magneto-optical defect center materials, such as diamond with nitrogen vacancy centers, that employs RF and optical excitation sources, a bias magnet, and a controller to apply binary code sequences and modulate light detection signals, enabling simultaneous measurement of magnetic fields on multiple axes without sensitivity loss, using techniques like shifted magnetometry adapted cancellation (SMAC) to cancel out noise and improve sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If advanced magnetic imaging systems are designed to operate in ambient conditions, then ease of operation and adaptability improve, but measurement precision deteriorates due to sensitivity loss in multi-axis measurements
Solution Approach 1:
The system segments the measurement process by using multiple sets of defect centers with different lattice orientations (e.g., <100> and <110> orientations) to simultaneously measure different axes of the magnetic field. Each orientation subset is excited with specific binary code sequences, allowing independent measurement channels that maintain sensitivity while operating in ambient conditions
Solution Approach 2:
The system applies periodic binary code sequences (e.g., pseudo-random binary sequences) to modulate the excitation of defect centers at different lattice orientations. This periodic modulation allows the system to distinguish between signals from different orientations through correlation detection, maintaining measurement precision across multiple axes while operating at room temperature
2Productivity
If multiple RF frequencies are applied simultaneously to measure magnetic fields on multiple axes, then productivity improves, but device complexity increases due to the need for multiple excitation sources and signal processing channels
Solution Approach 1:
The system combines multiple measurement functions into a single defect center material by utilizing different lattice orientations within the same material. Multiple RF frequencies are applied simultaneously to the same material, and the responses are separated through signal processing using binary code modulation and correlation detection, eliminating the need for physically separate sensors for each axis
Solution Approach 2:
The defect center material serves multiple functions simultaneously: it acts as both the sensing element and the signal modulation medium. The same material responds to multiple RF frequencies with different binary code sequences, allowing a single device to perform multi-axis measurements without requiring separate specialized components for each measurement channel
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
Enables sensitive magnetic field measurements at room temperature and atmospheric pressure, maintaining high sensitivity across multiple axes without the sensitivity loss associated with sequential measurements, effectively addressing the limitations of existing systems.
Implementation Method 1
a magneto-optical defect center material comprising a plurality of defect centers
Implementation Method 2
a bias magnet configured to separate RF resonance responses of the lattice oriented subsets of the magneto-optical defect center material
Implementation Method 3
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
Data Source
AI summary
The present disclosure relates to apparatuses and methods to utilize techniques to simultaneously measure Ramsey pulses on a plurality of axes of the magneto-optical defect center material with defect centers. When measuring simultaneously, there is potentially no relative sensitivity loss relative to scalar measurements. Therefore, Ramsey pulses on a plurality of axes of a magneto-optical defect material with defect centers are measured while bypassing the sensitivity loss incurred with sequential measurement techniques. The axes are interrogated simultaneously while allowing for isolation of the individual responses from the signal detected from the magneto-optical defect center material. In some embodiments, the system utilizes a special Ramsey pulse sequence pair or a ‘shifted magnetometry adapted cancellation’ (SMAC) pair to detect and measure the magnetic field acting on the system.