Wearable ADFMR Sensor for Biological EM Field Monitoring
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Solution Overview
Problem
Current magnetic sensors for monitoring biological electromagnetic fields, such as brain activity, are large, costly, and limited by environmental conditions, making them inflexible and unsuitable for diverse user sizes, and are typically restricted to stationary measurements.
Innovation Solution
A wearable device integrating acoustically driven ferromagnetic resonance (ADFMR) sensors that are compact, operate at normal temperatures, and can be positioned directly on the scalp, enabling high-resolution, real-time monitoring of biological EM fields with reduced noise density and power consumption, and can be adapted for different user sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SERF and SQUID magnetic sensors are used to monitor biological activity, then measurement precision is improved, but device complexity and size increase significantly
Solution Approach 1:
The patent extracts the sensing function from complex room-sized systems into compact integrated circuits. The ADFMR sensor design isolates the essential ferromagnetic resonance detection mechanism while eliminating the need for large cavities, heavy shielding, and complex cryogenic infrastructure, achieving high sensitivity in a miniaturized form factor suitable for wearable devices
Solution Approach 2:
The patent changes the operating parameters of magnetic sensors by using acoustically driven ferromagnetic resonance at room temperature instead of requiring cryogenic temperatures. This parameter change enables the use of standard semiconductor manufacturing processes and eliminates complex temperature control systems, reducing device complexity while maintaining measurement precision
2Measurement precision
If SERF and SQUID sensors are used for biological monitoring, then measurement precision is improved, but the system requires room-sized infrastructure and heavy shielding
Solution Approach 1:
The patent extracts the sensing function from complex room-sized systems into compact integrated circuits. The ADFMR sensor design isolates the essential ferromagnetic resonance detection mechanism while eliminating the need for large cavities, heavy shielding, and complex cryogenic infrastructure, achieving high sensitivity in a miniaturized form factor suitable for wearable devices
Solution Approach 2:
The patent uses standard semiconductor manufacturing processes to create integrated circuit copies of the ADFMR sensor design. This copying approach enables mass production of compact sensors that can be deployed in wearable devices, replacing the need for unique, large-scale laboratory installations
3Device complexity
If Hall effect sensors and magnetoresistive sensors are used, then device size is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the operating parameters of magnetic sensors by using acoustically driven ferromagnetic resonance at room temperature instead of requiring cryogenic temperatures. This parameter change enables the use of standard semiconductor manufacturing processes and eliminates complex temperature control systems, reducing device complexity while maintaining measurement precision
4Measurement precision
If traditional FMR techniques are used, then measurement precision is improved, but the device requires large cavities and high power drive
Solution Approach 1:
The patent uses acoustic waves to drive ferromagnetic resonance in the sensor material. This mechanical vibration approach replaces the need for large electromagnetic cavities and high power RF drive signals, enabling compact sensor design with low power consumption while maintaining measurement precision
Solution Approach 2:
The patent replaces traditional electromagnetic cavity-based FMR excitation with acoustic wave-driven resonance. This substitution eliminates the need for large cavities and high power RF amplifiers, reducing both device size and power consumption while achieving the same magnetic property detection 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 ADFMR sensor system provides a portable, flexible, and cost-effective solution for monitoring biological EM fields, allowing for continuous, real-time biometric data collection during movement and integration with various devices, including brain-computer interfaces, with improved sensitivity and reduced power usage.
Implementation Method 1
Ferromagnetic resonance (FMR) may be used to measures magnetic properties of materials by detecting the precessional motion of the magnetization in a ferromagnetic sample
Implementation Method 2
A sensor device includes an acoustically driven ferromagnetic resonance (ADFMR) sensor that propagates acoustic waves on a surface of a piezoelectric substrate
Data Source
AI summary
A system and method for a wearable field sensing device for biological electromagnetic (EM) field measurement including: a wearable structure; a biological sensor array, on or within the wearable structure, such that each biological sensor is situated adjacent to the body of the user, and wherein each biological sensor includes at least one ferromagnetic resonance (FMR) sensor; a power system, providing the power for the system; and control circuitry, electrically coupled to the system. The FMR sensor comprises an acoustically driven ferromagnetic resonance (ADFMR) sensor. The system may additionally include sensor shielding and an ambient sensor array to detect a block external fields.