Stretchable Strain Gauge Layout for Higher Sensitivity
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Solution Overview
Problem
Existing stretchable devices require improved sensitivity in detecting the amount of strain in their strip portions.
Innovation Solution
A stretchable device with a resin base member comprising island-shaped portions and strip portions, equipped with a first and second gauge lines, where the second gauge line has a higher gauge factor than the first, and both lines extend along the strip portion direction with the second gauge line having a shorter length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single gauge line is used in the strip portion, then the device structure is simple, but the strain detection sensitivity is insufficient
Solution Approach 1:
The gauge line is divided into multiple segments (first gauge line and second gauge line) with different characteristics. The first gauge line has a lower gauge factor and longer length, while the second gauge line has a higher gauge factor and shorter length. This segmentation allows each segment to serve different detection purposes, improving overall strain detection sensitivity without creating a single point of failure.
Solution Approach 2:
Different portions of the strip are assigned different gauge line configurations based on local strain characteristics. The first gauge line is positioned in regions experiencing lower strain, while the second gauge line with higher gauge factor is positioned in regions experiencing higher strain. This local optimization maximizes detection sensitivity in each specific location.
2Measurement precision
If the gauge line length is increased to cover more strain areas, then the detection coverage is improved, but the risk of gauge line breakage increases
Solution Approach 1:
The gauge line is segmented into multiple independent lines with different lengths. The first gauge line extends further to cover larger strain areas, while the second gauge line is shorter and positioned in critical high-strain regions. This segmentation ensures that if one line breaks, the other can still provide detection coverage.
Solution Approach 2:
The gauge lines have different parameters (length, gauge factor) optimized for different functions. The first gauge line uses longer length for broader coverage in low-strain areas, while the second gauge line uses higher gauge factor for sensitive detection in high-strain areas with reduced length to minimize breakage risk.
3Measurement precision
If the same gauge line is used throughout the strip portion, then the manufacturing process is simple, but the detection accuracy for different strain regions is insufficient
Solution Approach 1:
The patent implements different gauge line configurations in different regions of the strip based on local strain characteristics. The first gauge line with lower gauge factor is used in low-strain regions, while the second gauge line with higher gauge factor is used in high-strain regions. This local differentiation improves detection accuracy while maintaining manufacturability through standardized fabrication processes.
Solution Approach 2:
The gauge lines have different parameters (gauge factor, length) tailored to their specific functional requirements. The first gauge line has lower gauge factor and longer length for low-strain regions, while the second gauge line has higher gauge factor and shorter length for high-strain regions. These parameter variations are achieved through controlled fabrication processes that maintain manufacturability.
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
Enhances strain detection sensitivity and reduces the risk of gauge line breakage by utilizing a higher gauge factor line for areas with significant strain and a shorter length for less strained areas, improving overall detection accuracy.
Implementation Method 1
a first gauge line and a second gauge line having a gauge factor higher than a gauge factor of the first gauge line, the first gauge line and the second gauge line being provided to each of the strip portions
Data Source
AI summary
According to an aspect, a stretchable device includes: a resin base member including a plurality of island-shaped portions spaced apart from each other and a plurality of strip portions that couple the island-shaped portions; and a first gauge line and a second gauge line having a gauge factor higher than a gauge factor of the first gauge line, the first gauge line and the second gauge line being provided to each of the strip portions. The first gauge line and the second gauge line each extend along an extending direction of the strip portion and are coupled along the extending direction of the strip portion. The length of the second gauge line along the extending direction of the strip portion is shorter than the length of the first gauge line along the extending direction of the strip portion.