Sensor Tag Resonance Element for Non-Electrical Object Detection
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Solution Overview
Problem
Conventional sensor tags require changes in dielectric constant or conductivity to sense physical quantities, limiting their ability to detect changes in objects without alterations in these properties.
Innovation Solution
A sensor tag design featuring a resonance element composed of closely arranged conductors with a sensing member that changes physical properties in response to object changes, allowing for electromagnetic wave frequency characteristic analysis to estimate the object's state without relying on conductivity or dielectric constant changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensing unit relies on changes in dielectric constant or conductivity to sense physical quantities, then the sensing mechanism is simple, but the sensing capability is limited to objects that cause such changes
Solution Approach 1:
The patent replaces the conventional electrical property-based sensing mechanism (dielectric constant/conductivity changes) with a mechanical resonance-based sensing mechanism. The resonance element's resonant frequency changes in response to physical quantities like mass, stiffness, or damping, enabling detection of objects that do not alter electrical properties. This substitution expands sensing versatility while maintaining relatively simple device structure.
Solution Approach 2:
The patent changes the sensing parameter from electrical properties (dielectric constant, conductivity) to mechanical resonance frequency. By monitoring shifts in resonant frequency of the resonance element, the system can detect various physical quantities including mass, stiffness, damping, and other mechanical properties, significantly broadening the range of detectable objects without complicating the sensing mechanism.
2Reliability
If the sensing unit requires changes in electrical characteristics to detect objects, then the detection method is straightforward, but it cannot detect objects that do not alter conductivity or dielectric constant
Solution Approach 1:
The patent substitutes electrical property detection with mechanical resonance detection. The resonance element responds to mechanical interactions with target objects, allowing reliable detection of objects that do not exhibit electrical property changes. This maintains detection reliability through well-established resonance measurement techniques while dramatically expanding the range of detectable objects.
Solution Approach 2:
The patent utilizes mechanical vibration and resonance of the resonance element to detect physical quantities. By exciting the resonance element and measuring its resonant frequency, the system can reliably detect objects through their mechanical interaction (mass loading, stiffness changes, damping) without requiring electrical property alterations, thus expanding detection versatility.
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
Enables the sensing of physical quantities such as displacement, vibration, and temperature without requiring changes in the sensing unit's electrical characteristics, enhancing the tag's ability to detect changes in objects without altering their conductivity or dielectric constant.
Implementation Method 1
a plurality of conductors arranged close to each other and to constitute a resonance element
Implementation Method 2
by a change in dielectric constant or conductivity described in Patent Literature 1
Implementation Method 3
a sensing member interposed between the plurality of conductors and having a physical property that changes due to a change in a physical quantity of an object to be sensed by the sensing member
Data Source
AI summary
A sensor tag includes a plurality of conductors to be arranged close to each other and to constitute a resonance element, and a sensing unit to be interposed between the plurality of conductors and to have a physical property that changes due to a change in a physical quantity of an object to be sensed by the sensing unit.