Force Sensor Thermal Insulation via Elastomer Segmentation
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Solution Overview
Problem
Force sensors using semiconductor or metal strain gauges face detection accuracy issues due to temperature-induced resistance imbalances, particularly when heat is generated and transferred unevenly across the force-sensitive diaphragm, leading to false strain measurements.
Innovation Solution
A force sensor design incorporating a force-sensitive elastomer with a thermal conductivity component and strategically placed strain gauges, where the peripheral part of the elastomer contacts the thermal conductivity component, and the remaining part is separated, creating an air gap for thermal insulation, thereby extending the heat conduction path and ensuring more uniform heat dissipation to the strain gauges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are mounted on the force-sensitive diaphragm to detect force, then force detection capability is achieved, but temperature-induced resistance imbalances cause detection errors
Solution Approach 1:
The force-sensitive diaphragm is divided into two distinct regions: a first region where strain gauges are mounted for force detection, and a second region that is thermally isolated from heat-generating components. This spatial segmentation allows the strain gauges to be positioned in a thermally stable environment, eliminating temperature-induced resistance imbalances while maintaining force detection capability.
Solution Approach 2:
A thermally insulating structure is introduced as an intermediary between the heat-generating component and the strain gauges. This intermediary blocks the thermal conduction path, preventing heat from reaching the strain gauges and causing resistance imbalances, while still allowing the force detection function to operate accurately.
2Measurement precision
If the force-sensitive diaphragm is made thin-walled for sensitivity, then detection sensitivity is improved, but heat conduction within the diaphragm causes temperature distribution errors
Solution Approach 1:
The thin-walled force-sensitive diaphragm is segmented into a first region for force sensing and a second region for thermal isolation. This segmentation allows the diaphragm to maintain its thin-walled sensitive structure where needed while creating a thermally protected zone for the strain gauges, resolving the conflict between sensitivity and thermal stability.
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 design enhances the detection accuracy of the force sensor by minimizing temperature-induced errors and ensuring more uniform heat transfer to the strain gauges, reducing detection inaccuracies caused by resistance imbalances.
Implementation Method 1
a thermal conductivity component adapted to transfer an external load to the force-sensitive elastomer
Implementation Method 2
A peripheral part of the force-sensitive elastomer is in contact with the thermal conductivity component, and a remaining part of the force-sensitive elastomer is separated from the thermal conductivity component
Data Source
AI summary
A force sensor includes a force-sensing elastomer, a thermal conductivity component adapted to transfer an external load to the force-sensitive elastomer, a plurality of strain gauges attached to the force-sensitive elastomer, and a circuit board. The circuit board electrically connects the plurality of strain gauges to a detection circuit adapted to detect a strain of the force-sensitive elastomer. A peripheral part of the force-sensitive elastomer is in contact with the thermal conductivity component, and a remaining part of the force-sensitive elastomer is separated from the thermal conductivity component. The plurality of strain gauges are attached to the remaining part of the force-sensitive elastomer and do not contact the thermal conductivity component.