Solid-State Sensor for Thermally Activated Magnetic and Resistive Aging
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Solution Overview
Problem
Existing methods for monitoring aging processes, such as in perishable items or engineering applications, fail to accurately account for variations in temperature and ambient conditions, leading to inaccurate determination of end-of-life dates.
Innovation Solution
A solid-state sensor using a composite structure with ferromagnetic nanoparticles in a non-ferromagnetic matrix, where the 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 interactions within the sensor material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed time period from initial manufacture is used to determine end-of-life date, then the method is simple to implement, but it fails to account for variations in temperature or other ambient conditions during the lifetime
Solution Approach 1:
The patent changes the parameter basis from simple time to a combined time-temperature parameter. The sensor material's physical property changes are monitored as a function of both time and temperature, allowing accurate determination of aging under varying ambient conditions while maintaining operational simplicity through automated sensing.
Solution Approach 2:
The patent replaces the mechanical/time-based aging determination method with a physical sensing mechanism. Instead of relying on chronological time tracking, the invention uses changes in physical properties (electrical resistance, magnetoresistance, or magnetization) of sensor material to detect aging, substituting a passive time-based system with an active physical measurement system.
2Measurement precision
If a solid-state sensor with temperature-dependent physical properties is used, then the accuracy of aging monitoring is improved, but the device complexity increases
Solution Approach 1:
The patent employs composite sensor materials that combine ferromagnetic nanoparticles with a matrix material. This composite structure provides both temperature sensitivity and aging detection capabilities in a single integrated material system, achieving enhanced measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The sensor material serves multiple functions simultaneously: it acts as both the sensing element for aging detection and the temperature-dependent physical property indicator. The same material that changes properties due to aging also responds to temperature variations, eliminating the need for separate temperature sensors and reducing overall device complexity.
3Measurement precision
If ferromagnetic nanoparticles are used in a non-ferromagnetic matrix, then the sensor can detect morphological changes through electrical resistance or magnetization changes, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating regions with different ferromagnetic nanoparticle concentrations or sizes within the matrix. This allows the sensor to detect morphological changes through localized property variations, enhancing detection sensitivity while tolerating broader manufacturing variations in overall nanoparticle distribution.
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 determination of aging thresholds, providing both time and temperature-dependent monitoring, which is essential for perishable items and industrial processes, improving the accuracy of expiration dates and process control.
Implementation Method 1
a physical property that varies as a function of both time and temperature... magnetization... Typically, the physical property changes faster with time as the temperature increases
Implementation Method 2
thermally activated magnetic and resistive aging... nanoparticles, such as nanoflakes, of a first material, such as a ferromagnetic material
Implementation Method 3
the physical property may be electrical resistance... Morphological changes occur within the sensor material, causing an appreciable change in electrical conductivity
Implementation Method 4
Morphological changes may reduce the magnetization of the solid-state material, which can be detected using a GMR (giant magnetoresistance) sensor
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
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.