Stretchable Device Strain Gauge Sensitivity
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Solution Overview
Problem
Existing stretchable devices face challenges in detecting applied loads with high sensitivity due to limitations in strain gauge sensitivity, particularly in the deformation of meandering hinges.
Innovation Solution
A stretchable device design incorporating a resin base member with meandering hinges and strain gauges arranged in a specific configuration, including inner and outer peripheral strain gauges, and electrical wiring to detect potential differences and enhance sensitivity through a Wheatstone bridge circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are provided to the hinges to detect the amount of strain, then load detection capability is improved, but sensitivity is insufficient
Solution Approach 1:
The patent combines multiple strain gauges (first strain gauge on the inner periphery and second strain gauge on the outer periphery of the hinge) into a single detection system. This merging of multiple sensing elements allows for differential measurement that amplifies the detection sensitivity while compensating for individual gauge limitations, directly resolving the contradiction between sensitivity and accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanism by using the hinge's meandering structure as a strain amplification element. The arcs in the meandering hinge deform under load, creating amplified strain that is then detected by the strain gauges. This intermediary structure enhances the sensitivity of detection without requiring more sensitive gauge materials.
2Measurement precision
If a single strain gauge is used on the hinge, then device complexity is reduced, but detection sensitivity is insufficient
Solution Approach 1:
The patent employs asymmetric placement of strain gauges on opposite sides of the hinge (inner periphery and outer periphery). This asymmetric configuration allows the gauges to experience different strain conditions under load, creating a differential signal that enhances sensitivity. The asymmetric arrangement maximizes the detection capability while maintaining a relatively simple two-gauge structure.
Solution Approach 2:
The patent segments the strain detection function by placing separate strain gauges at different locations on the hinge structure. Instead of using a single complex high-sensitivity gauge, the system divides the detection into multiple simpler gauges positioned at strategic locations, achieving enhanced sensitivity through spatial segmentation of the sensing function.
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 achieves higher sensitivity in detecting strain by utilizing the potential differences across strain gauges, effectively improving the detection of applied loads on the stretchable device.
Implementation Method 1
detect the amount of strain (amount of deformation) of the hinges
Implementation Method 2
When a tensile load acts on the stretchable device, the arcs of the hinge deform to expand
Data Source
AI summary
A stretchable device includes strain gauges and electrical wiring. Each strain gauge includes a first strain gauge and a second strain gauge. The first strain gauge and the second strain gauge are coupled to each other. The electrical wiring includes a first potential line, a second potential line, a coupling line coupling the first potential line to the second potential line, a first signal line, and a second signal line. The first signal line detects a third potential at a first coupling point. The second signal line detects a fourth potential at a midpoint of the coupling line. One of the first strain gauge and the second strain gauge is an inner peripheral strain gauge. The other thereof is an outer peripheral strain gauge. The amount of change in resistance of each strain gauge is detected based on a potential difference between the third potential and the fourth potential.