Strain Detection Device with Opposed Sensor Sheets
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Solution Overview
Problem
Existing strain gauge sensors face challenges in accurately detecting strain due to differences in temperature conditions between the front and rear sides of the sheet, which affect the alignment of wiring resistance, leading to reduced accuracy in strain detection.
Innovation Solution
A double-sided strain gauge sensor device is designed with a flexible base having a first and second sensor sheet on opposite sides, connected via flexible printed circuits and a relay board, where strain gauges on both sides are opposed and connected in series to minimize the impact of wiring resistance, allowing for simultaneous and accurate detection of strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are provided on both front and rear sides of the sheet to detect curved shape, then the ability to detect curvature is improved, but wiring resistance alignment becomes difficult due to temperature differences between sides
Solution Approach 1:
A temperature measurement unit is introduced as an intermediary to measure the temperature difference between front and rear sides of the sheet. This temperature data is then used to correct the resistance values of strain gauges, allowing accurate curvature detection despite temperature-induced wiring resistance variations. The temperature measurement unit acts as a mediator that enables the system to compensate for environmental effects.
Solution Approach 2:
The system changes the parameter being measured from raw resistance values to temperature-compensated resistance values. By measuring temperature and using it to adjust resistance readings, the system transforms the measurement parameter to account for thermal effects, thereby maintaining wiring resistance alignment and detection accuracy under varying temperature conditions.
2Productivity
If multiple strain gauges are energized simultaneously to improve detection speed, then productivity is improved, but power consumption increases
Solution Approach 1:
Instead of energizing all strain gauges simultaneously, the system employs periodic action by sequentially energizing strain gauges in groups or individually over time. The controller activates different strain gauges at different time intervals, completing full detection cycles periodically. This approach maintains detection productivity while significantly reducing peak power consumption compared to simultaneous energization of all gauges.
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 enables precise detection of strain by isolating resistance changes of the strain gauges from wiring resistances, improving accuracy and reducing power consumption by scanning strain gauges sequentially, while maintaining high precision in curvature detection.
Implementation Method 1
By wrapping the strain gauge sensor around a curved subject and detecting the resistance change of each strain gauge, a curved shape of the subject can be detected
Data Source
AI summary
According to one embodiment, a strain detection device includes a first sensor sheet and a second sensor sheet opposed to the first sensor sheet with a base sandwiched therebetween, and a controller which drives the first sensor sheet and the second sensor sheet. Each of the first sensor sheet and the second sensor sheet includes strain gauges arranged in a row, power supply lines and first signal lines connected to first ends of the strain gauges, and ground lines and second signal lines connected to second ends of the strain gauges. Each of the ground lines of the first sensor sheet is connected to corresponding one of the power supply lines of the second sensor sheet.