Micro-DNV Sensor for Compact Vector Magnetometry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current magnetic sensing technologies, such as Hall-effect devices, are limited by their size, weight, power consumption, and sensitivity, making them inadequate for applications requiring compact, high-sensitivity, and low-power magnetic field measurements, especially in ambient conditions and for applications like navigation and biological imaging.
Innovation Solution
A micro-diamond nitrogen-vacancy (micro-DNV) sensor is developed by embedding a micron-sized DNV crystal into a bonding material, integrated with a micro-RF source, a micron-sized light source, and micro-photo detectors, allowing for vector magnetometry at room temperature and atmospheric pressure, enabling precise magnetic field measurements with reduced size, weight, and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional magnetic sensing technologies (e.g., Hall-effect devices) are used, then magnetic field detection is achieved, but the device size, weight, and power consumption are excessive for compact applications
Solution Approach 1:
The patent replaces conventional Hall-effect magnetic sensors with nitrogen-vacancy (NV) centers in diamond, which utilize quantum mechanical effects (spin resonance) instead of classical electromagnetic induction. This substitution enables miniaturization to micron-scale while maintaining or improving magnetic field sensitivity, directly resolving the contradiction between device size and measurement precision.
Solution Approach 2:
The patent changes the operating parameters of magnetic sensing by using NV centers that can be optically initialized and read out at room temperature, unlike conventional sensors that require cryogenic temperatures or high vacuum. This parameter change (operating temperature, readout mechanism) enables compact device design without sacrificing detection sensitivity.
2Measurement precision
If advanced magnetic imaging systems are used, then high sensitivity is achieved, but the systems require high vacuum and/or cryogenic temperatures which limit applicability
Solution Approach 1:
The patent replaces cryogenic cooling systems and vacuum chambers with optically addressable NV centers that operate at room temperature. The quantum spin states of NV centers can be initialized, manipulated, and read out using laser excitation and microwave pulses, eliminating the need for extreme environmental conditions and greatly expanding operational versatility.
Solution Approach 2:
The patent changes the operational temperature parameter from cryogenic (near absolute zero) to room temperature by utilizing the unique property of NV centers in diamond that maintain quantum coherence at ambient conditions. This parameter change enables deployment in diverse environments including biological systems, portable devices, and field applications.
3Use of energy by moving object
If compact magnetic sensors are developed, then size and power are reduced, but sensitivity and vector accuracy deteriorate
Solution Approach 1:
The patent replaces power-intensive conventional sensor electronics with optically driven NV center detection. The readout mechanism uses photoluminescence detection of NV centers, which consumes minimal power compared to amplifiers and signal processing electronics in Hall-effect devices. The micron-scale NV crystal embedded in a chip integrates sensing, processing, and readout in a low-power configuration that maintains vector accuracy.
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 micro-DNV sensor provides a compact, low-power solution for sensitive magnetic field detection, suitable for various industrial applications, including navigation and communication devices, with extended battery life and enhanced precision, capable of operating below 1.0 micro-Tesla sensitivity.
Implementation Method 1
A micro-DNV assembly is formed by integrating the micro-DNV sensor with a micro-radio-frequency (RF) source, a micron-sized light source, a near-field fixed bias magnet, and one or more micro-photo detectors
Implementation Method 2
one or more micro-photo detectors that are configured to detect fluorescence radiation emitted by stimulated nitrogen-vacancy centers
Data Source
AI summary
A method for providing a miniature vector magnetometer includes embedding a micron-sized diamond nitrogen-vacancy (DNV) crystal into a bonding material. The bonding material including the embedded micron-sized DNV crystal is cured to form a micro-DNV sensor. A micro-DNV assembly is formed by integrating the micro-DNV sensor with a micro-radio-frequency (RF) source, a micron-sized light source, a reference bias magnet, and one or more micro-photo detectors. The micro-DNV assembly is operable to perform vector magnetometry when positioned in an external magnetic field.