Layered Strain Gauge Lines for Accurate Strain Detection
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Solution Overview
Problem
The accuracy of strain detection in existing strain gauges is reduced due to the line connected to the resistor functioning as a portion of the resistor, which affects the strain measurement.
Innovation Solution
A strain gauge design featuring a flexible substrate with a resistor and electrodes connected via lines, where the lines consist of a first metallic layer and a second metallic layer with lower resistance than the first, limiting the line's resistance to enhance strain detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a line is used to connect the resistor to the electrode, then electrical connection is achieved, but the line functions as a portion of the resistor which reduces strain detection accuracy
Solution Approach 1:
The patent changes the resistance parameter of the line by using a two-layer metallic structure where the second metallic layer has lower resistance than the first. This parameter change ensures the line's resistance is negligible compared to the resistor, preventing the line from functioning as a portion of the resistor and thereby maintaining strain detection accuracy.
2Measurement precision
If the line has low resistance to improve accuracy, then strain detection precision improves, but the line may become more susceptible to thermal effects
Solution Approach 1:
The patent employs a composite metallic layer structure where the first metallic layer provides structural integrity and the second metallic layer provides low resistance. This composite approach balances electrical performance with thermal stability, as the layered structure can be designed to have appropriate thermal properties while maintaining low electrical resistance for accurate strain detection.
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 design improves strain detection accuracy by minimizing the line's resistance, allowing for precise strain measurement and reducing transverse sensitivity, while maintaining mechanical stability and thermal resistance.
Implementation Method 1
Each of the lines includes a first metallic layer and a second metallic layer that is formed of a material having a lower resistance than a material of the first metallic layer
Data Source
AI summary
A strain gauge includes a flexible substrate, at least one resistor formed on or above the substrate, and a pair of electrodes formed on or above the substrate, electrodes being electrically coupled to the resistor via lines, respectively. Each of the lines electrically connects an end of the resistor and a given electrode, the end being situated in a width direction of a grid. Each of the lines includes a first metallic layer and a second metallic layer that is formed of a material having a lower resistance than a material of the first metallic layer, the second metallic layer being situated on the first metallic layer.