Strain Sensor Substrate Error Correction for Curved Surface Measurement
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Solution Overview
Problem
Measurement errors accumulate when calculating the curvature radius of a curved surface using a sensor array sheet with strain gauges, leading to misalignment between the start and end point coordinates, especially as the distance from the calculation start point increases.
Innovation Solution
A detection device with a sensor substrate featuring strain sensors on a flexible substrate, where the curvature radius between adjacent sensors is calculated based on preceding sensor values, and positions are corrected by distributing the misalignment error across nodes, ensuring accurate coordinate matching between the start and end points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential calculation of coordinate values is performed using curvature radius from preceding strain sensors, then the measurement process can be implemented, but measurement errors accumulate as distance from the calculation start point increases
Solution Approach 1:
The patent applies feedback by calculating the displacement between the actual end point position and the calculated end point position, then using this displacement information to correct the coordinate values of all intermediate nodes. This feedback mechanism eliminates the accumulated errors by adjusting the coordinate system based on the known actual position of the end point, thereby improving measurement precision while maintaining the sequential calculation approach.
Solution Approach 2:
The patent changes the parameter reference by switching from using only calculated curvature radii to using the actual measured position of the end point as a reference. By redefining the coordinate system based on the actual end point position rather than relying solely on sequential calculations, the patent eliminates error accumulation and improves the accuracy of all coordinate values in the measurement chain.
2Ease of operation
If sequential calculation is used to determine relative positions of strain sensors, then coordinate values can be obtained, but misalignment occurs between start point and end point coordinates
Solution Approach 1:
The patent uses feedback by comparing the calculated end point position with the actual measured end point position, then applying correction values back to all coordinate points in the sequence. This ensures that the final coordinate system is aligned with the actual physical positions, eliminating misalignment between start and end points while preserving the simplicity of sequential calculation.
Solution Approach 2:
The patent performs preliminary measurement of the actual end point position before final coordinate determination. By having this reference information available in advance, the system can adjust and align all calculated coordinate values to match the actual physical configuration, ensuring proper alignment between start and end points.
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
The solution effectively corrects calculation errors, ensuring precise alignment of start and end point coordinates, improving the accuracy of curved surface measurements by distributing misalignment errors among nodes.
Implementation Method 1
a sensor substrate including a plurality of strain sensors arranged on a rectangular flexible substrate
Data Source
AI summary
Disclosed herein is a detection device including a sensor substrate including strain sensors arranged on a rectangular flexible substrate at fixed intervals in a longitudinal direction. A curvature radius between a pair of adjacent strain sensors is calculated on a value from a preceding strain sensor of the pair of adjacent sensors. When a start point node is defined as a position of a first strain sensor at one end of the strain sensors, a relative position of each of the strain sensors is determined by sequentially adding the relative positions. When the first and second strain sensors overlap, positions of the first and second strain sensors are considered identical on relative space. A position of each strain sensor is corrected based on a difference between a calculated position of the second strain sensor determined by sequentially adding the relative positions and actual position of the second strain sensor.