Force Sensor Segmented Conductive Member for Perpendicular Force
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Solution Overview
Problem
Force sensors with isotropic gauge factors face limitations in expanding their application range due to challenges in accurately measuring perpendicular forces.
Innovation Solution
A force sensor design featuring a strain body with a supporting portion and an electrically conductive member placed on its main face, annularly extending around a pole and divided at specific latitude regions, allowing for the measurement of perpendicular force components by offsetting changes in electrical resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electrically conductive member with isotropic gauge factor is used, then the application range is expanded, but the measurement accuracy of perpendicular force components deteriorates
Solution Approach 1:
The annular electrically conductive member is divided into multiple segments along the circumferential direction. This segmentation allows the sensor to selectively detect strain components in specific directions while filtering out others, thereby improving measurement accuracy of perpendicular force components while maintaining the isotropic gauge factor advantage
Solution Approach 2:
The electrically conductive member is positioned at a specific latitude region on the strain body where the sum of longitudinal and latitudinal strain amounts meets a reference value. This localized positioning optimizes the measurement of perpendicular force components by utilizing the specific strain distribution characteristics at that region
2Measurement precision
If the electrically conductive member is placed in a designated latitude region with high strain magnitude, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The strain body is designed with rotational symmetry, allowing the same annular electrically conductive member structure to be used regardless of the number of perpendicular force components to be measured. By rotating the segmented members, the sensor can detect force components in different directions, eliminating the need for multiple different sensor structures and reducing overall device complexity
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 measurement accuracy of perpendicular force components by increasing the change in electrical resistance values, thereby expanding the application range of force sensors with isotropic gauge factors.
Implementation Method 1
an electrically conductive member placed on a main face of the strain body and having an isotropic gauge factor in a direction of the main face
Data Source
AI summary
Provided is a force sensor capable of expanding the application range of an electrically conductive member having an isotropic gauge factor. The electrically conductive member is placed in a designated latitude region on a main face of the strain body to annularly extend around a pole and to be divided at a position. The designated latitude region is a latitude region in which the magnitude of the sum of a first strain amount in the longitude line direction of the strain body relative to the pole and a second strain amount in the latitude line direction is not less than a reference value when a force having a component in the perpendicular direction to the main face is applied to the strain body.