Stretchable Strain Gauge Layout for Low-Noise Load Detection
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Solution Overview
Problem
Stretchable devices with strain gauges face noise input issues due to deformation of stretchable resins, which affects accurate load detection in unintended directions.
Innovation Solution
A stretchable device design featuring a detection region and a non-detection region, where detection hinges with strain gauges are only over the detection region, and stretchable resins are unbonded in the detection region to prevent noise from being transmitted to the strain gauges, allowing for accurate load detection in the intended direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If strain gauges are provided to all hinges to detect loads in multiple directions, then detection capability is improved, but noise from unintended direction loads increases
Solution Approach 1:
The stretchable substrate is divided into a detection region and a non-detection region. Strain gauges are only provided on hinges within the detection region, while hinges in the non-detection region are excluded from load detection. This segmentation allows the system to detect loads in the intended direction while preventing noise from unintended directions.
Solution Approach 2:
Different regions of the stretchable substrate are assigned different functions: the detection region is designed to detect loads with strain gauges on hinges, while the non-detection region is designed to prevent noise transmission. This local differentiation enables selective load detection without noise interference.
2Strength
If stretchable resins are bonded across the entire substrate, then structural integrity is improved, but noise transmission to strain gauges increases
Solution Approach 1:
The bonding configuration of stretchable resins is segmented into two zones: in the non-detection region, resins are bonded to the stretchable substrate to maintain structural integrity, while in the detection region, resins are not bonded to prevent noise transmission to strain gauges. This segmentation resolves the contradiction between strength and noise prevention.
Solution Approach 2:
The bonding properties of stretchable resins are locally differentiated: bonded in the non-detection region for structural support, and unbonded in the detection region to eliminate noise transmission. This local quality variation enables simultaneous achievement of structural integrity and noise reduction.
3Area of stationary object
If strain gauges are provided on hinges in the non-detection region, then detection coverage is improved, but measurement precision deteriorates due to noise
Solution Approach 1:
The detection substrate is segmented into detection and non-detection regions. Strain gauges are exclusively placed on hinges in the detection region, while hinges in the non-detection region are excluded from detection. This segmentation ensures that only hinges free from noise transmission contribute to load detection, thereby maintaining high measurement precision.
Solution Approach 2:
Different regions are assigned different detection qualities: the detection region has high measurement precision with strain gauges on unbonded hinges, while the non-detection region is excluded from detection to prevent noise. This local quality differentiation optimizes both detection coverage and accuracy.
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 configuration effectively reduces noise input to strain gauges, enhancing the accuracy of load detection by isolating the detection hinges from resin deformation, thereby improving detection sensitivity and reducing false readings.
Implementation Method 1
provide strain gauges to the hinges and detect the amount of strain (amount of deformation) of the hinges
Implementation Method 2
when a load is applied to the stretchable device, and the stretchable resins deform, the stretchable substrate deforms with the deformation of the stretchable resins
Data Source
AI summary
According to an aspect, a stretchable device includes: a stretchable substrate comprising bodies and hinges that couple the bodies to each other; and a pair of stretchable resins with the stretchable substrate interposed therebetween. The stretchable device includes a detection region in which a load is capable of being detected and a non-detection region when viewed in a stacking direction in which the stretchable substrate and the stretchable resins overlap. One or more of the hinges are detection hinges each provided with a strain gauge. All of the detection hinges overlap the detection region when viewed in the stacking direction. The stretchable resins each includes: a bonded region that overlaps the non-detection region when viewed in the stacking direction and is bonded to the stretchable substrate; and an unbonded region that overlaps the detection region when viewed in the stacking direction and is not bonded to the stretchable substrate.