Strain Generation Body for Six-Axis Force Sensor Accuracy
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Solution Overview
Problem
Existing six-axis force sensors face challenges in providing high-density, high-accuracy strain sensors on strain generation bodies, leading to increased temperature errors and external noise interference, which degrade detection accuracy.
Innovation Solution
A strain generation body design featuring a center part, outer-peripheral part, and connecting parts with strain sensors and reference resistors integrated on main surfaces, forming bridge circuits to reduce temperature errors and external noise, while allowing for high-density and accurate sensor placement using a thin-film manufacturing technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain sensors are provided on strain generation bodies with high density and high accuracy, then detection precision is improved, but temperature error between strain sensors and reference resistors increases and external noise influence increases
Solution Approach 1:
The patent merges the reference resistors with the strain sensors by integrating them into a single strain generation body structure. The reference resistors are disposed on the same substrate as the strain sensors, allowing them to experience identical temperature conditions and mechanical strain, thereby eliminating temperature errors and noise through combined measurement and compensation
Solution Approach 2:
The patent introduces an intermediary mechanism where the reference resistors serve as mediators to compensate for temperature effects and external noise. By measuring the same environmental conditions that affect the strain sensors, the reference resistors enable error compensation through bridge circuit calculations, reducing the harmful effects of temperature and noise
2Measurement precision
If a larger number of strain sensors are disposed to supplement detection accuracy, then detection precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple functions into a single integrated structure where strain sensors and reference resistors share the same strain generation body and substrate. This merging reduces the total number of discrete components and simplifies the overall device architecture while maintaining high detection accuracy through the integrated bridge circuit configuration
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 detection accuracy by minimizing temperature errors and external noise, allowing for precise force and torque detection in six-axis directions without the need for numerous additional sensors or adhesive attachments, thus improving sensor performance and reducing manufacturing complexity.
Implementation Method 1
deformation of strain sensors (strain gauges) provided on the strain generation bodies are converted into electrical signals
Implementation Method 2
reference resistors which are provided on a main surface of the center part and which constitute bridge circuits together with the strain sensors
Data Source
AI summary
A strain generation body and a force sensor equipped with the strain generation body, which can reduce a temperature error between strain sensors and reference resistors and the influence of external noise and which can improve detection accuracy, are provided. A strain generation body comprises a center part, an outer-peripheral part, connecting parts, a plurality of strain sensors, a plurality of reference resistors. The outer-peripheral part surrounds a periphery of the center part. The connecting parts connect the center part and the outer-peripheral part. The strain sensors are provided on main surfaces of the connecting parts. The reference resistors are provided on a main surface of the center part and constitute bridge circuits together with the strain sensors.