Nanostructured Ferromagnetic Sensor for Aging Monitoring
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Solution Overview
Problem
Current methods for monitoring aging processes, such as in perishable items or engineering applications, fail to account for variations in temperature and ambient conditions, leading to inaccurate determination of end-of-life dates.
Innovation Solution
A solid-state sensor apparatus with nanostructured ferromagnetic materials embedded in a non-ferromagnetic matrix, where physical properties like electrical resistance or magnetization change with both time and temperature, allowing for more accurate monitoring of aging by detecting morphological changes and temperature-dependent decay rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple timing mechanism is used to determine end-of-life date, then the device complexity is low, but the measurement precision of aging is insufficient
Solution Approach 1:
The patent uses composite materials consisting of ferromagnetic nanoparticles embedded in a non-ferromagnetic matrix material. This composite structure enables the sensor to exhibit both magnetic and resistive aging properties that are sensitive to temperature and time, thereby improving aging monitoring accuracy without requiring complex device architecture
Solution Approach 2:
The patent exploits changes in physical parameters (magnetization and electrical resistance) of the sensor material as functions of time and temperature. By monitoring these parameter changes, the system achieves precise aging detection while maintaining relatively simple device structure
2Reliability
If fixed time period from manufacture is used for end-of-life determination, then the ease of operation is high, but the reliability of aging assessment is low
Solution Approach 1:
The patent implements a feedback mechanism where the sensor continuously monitors its own magnetization and resistance changes, providing real-time information about the aging state of the monitored item. This feedback enables reliable aging assessment while automating the process to maintain ease of operation
Solution Approach 2:
The patent replaces simple mechanical timing mechanisms with a physical field-based sensing system that uses magnetic and electrical property changes to monitor aging. This substitution improves reliability by accounting for temperature and actual usage conditions while maintaining operational simplicity through automated detection
3Measurement precision
If temperature variations are not accounted for in aging monitoring, then the device complexity is low, but the measurement precision of end-of-life date is insufficient
Solution Approach 1:
The patent merges temperature sensing capability with the aging monitoring function by utilizing the inherent temperature dependence of the magnetic and resistive properties of the sensor material. This integration allows simultaneous measurement of temperature and aging state without requiring separate temperature compensation mechanisms
Solution Approach 2:
The sensor material exhibits multiple functions: it serves as both the aging indicator and the temperature sensor. The same ferromagnetic nanoparticle composite that shows aging-related magnetization changes also exhibits temperature-dependent magnetic properties, enabling dual functionality in a single component system
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
This approach enables precise tracking of aging processes, providing a more accurate indication of spoilage or degradation by considering both time and temperature variations, thus improving the determination of expiration dates and maintaining product quality.
Implementation Method 1
Morphological changes occur within the sensor material, causing an appreciable change in electrical conductivity. Nanostructures may melt and interact with each other to form nanowires of the first material within the matrix material.
Implementation Method 2
Morphological changes may reduce the magnetization of the solid-state material, which can be detected using a GMR (giant magnetoresistance) sensor.
Data Source
AI summary
Examples of the present invention include apparatus and methods for monitoring aging of an item. A solid-state structure is located within, adjacent to, or otherwise proximate the item, the solid-state structure including nanostructures. The electrical resistance and/or magnetization of the solid-state structure is determined to determine the degree of aging of the item. In representative examples, the solid-state structure includes nanostructures of a metal, such as a ferromagnetic metal, within a non-magnetic matrix, such as a semimetal, semiconductor, or insulator.