Magnetometer with Dual RF Elements and Optical Waveguide
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Solution Overview
Problem
Current magnetometers using magneto-optical defect center materials face challenges in achieving high sensitivity, rapid signal capture, and compact size, particularly in environments requiring ambient conditions, and struggle with uniform microwave excitation and large bandwidth.
Innovation Solution
A magnetometer design incorporating a nitrogen vacancy (NV) diamond material with a dual RF element arrangement, active cooling for the optical excitation source, and a Halbach array magnetic field generator, along with an optical waveguide assembly and adjustable light collection systems, to enhance light collection and uniform RF excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single RF element is used for excitation, then the device structure is simple, but the RF excitation uniformity and bandwidth are insufficient
Solution Approach 1:
The patent divides the RF excitation function into two separate elements: a first RF element for providing RF excitation and a second RF element for providing bias magnetic field. This segmentation allows each element to be optimized for its specific function, improving overall excitation uniformity and bandwidth while maintaining manageable system complexity through modular design.
Solution Approach 2:
The second RF element serves dual purposes: it provides both RF excitation and bias magnetic field generation. This multi-functionality reduces the number of separate components needed while improving excitation uniformity, effectively resolving the contradiction between measurement precision and device complexity.
2Productivity
If the magnetometer is designed for high sensitivity and rapid signal capture, then the bandwidth is improved, but the device size and power consumption increase
Solution Approach 1:
The patent combines multiple functions into integrated components: the optical excitation source and optical detector are mounted on the same substrate as the magneto-optical defect center material, and the dual RF elements are positioned to provide both excitation and bias fields simultaneously. This merging reduces overall device volume while maintaining high bandwidth and signal capture rate through efficient spatial utilization.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of components, particularly in the positioning of RF elements relative to the magneto-optical defect center material and in the mounting structures. This dimensional optimization allows high-performance components to be packed into a compact volume without compromising signal capture capabilities.
3Measurement precision
If the magnetometer operates in restricted conditions (high vacuum and cryogenic temperatures), then the measurement precision is improved, but the adaptability to ambient conditions is reduced
Solution Approach 1:
The patent employs magneto-optical defect center materials whose properties can be tuned through parameter changes in the material composition and defect structure. This allows the system to maintain high measurement precision across different temperature conditions without requiring cryogenic cooling, thereby adapting to ambient environments while preserving accuracy.
Solution Approach 2:
The patent replaces mechanical cooling systems with optical and electromagnetic control mechanisms. By using optical excitation and RF field control to achieve the desired measurement conditions, the system eliminates the need for cryogenic temperature maintenance, enabling operation in ambient conditions while maintaining precision.
4Measurement precision
If the light collection system is enhanced to improve sensitivity, then the optical signal detection is improved, but the device complexity and alignment requirements increase
Solution Approach 1:
The patent integrates the optical excitation source and optical detector directly onto the substrate containing the magneto-optical defect center material. This merging eliminates the need for separate light collection assemblies, reducing device complexity while maintaining high optical signal detection sensitivity through direct coupling.
Solution Approach 2:
The patent introduces an optical waveguide as an intermediary to couple the magneto-optical defect center material to the optical detector. This waveguide simplifies the light collection path, reducing alignment requirements and structural complexity while maintaining efficient optical signal transmission and detection sensitivity.
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 design improves sensitivity and bandwidth, allowing for efficient magnetic field detection in various conditions while maintaining a compact form factor, and enables accurate magnetic field measurement with improved light collection and uniform RF excitation.
Implementation Method 1
Magneto-optical defect center materials with defect centers can be used to sense an applied magnetic field by transmitting light into the materials and measuring the responsive light that is emitted
Implementation Method 2
an optical waveguide assembly comprising an optical waveguide with a hollow core and at least one optical filter coating, wherein the optical waveguide assembly is configured to transmit the optical signal to the optical detector through the at least one optical filter coating
Implementation Method 3
a magnetic field generator configured to generate a magnetic field detected at the magneto-optical defect center material
Data Source
AI summary
A magnetometer for magnetic detection includes a magneto-optical defect center material having at least one magneto-optical defect center; a radio frequency (RF) exciter system including a radio frequency (RF) excitation source; an optical excitation system including an optical excitation source; an optical detector configured to receive an optical signal based on light emitted by the magneto-optical defect center material due RF excitation and optical excitation provided to the magneto-optical defect center material via the RF excitation source and the optical excitation source, respectively; a magnetic field generator configured to generate a magnetic field detected at the magneto-optical defect center material; and a system controller.