Multi-Layer Strain Gauge Sensor for Curved Surface Detection
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Solution Overview
Problem
Existing strain detection devices face challenges in accurately detecting curved surfaces due to limitations in sensitivity and precision, particularly when dealing with complex geometries.
Innovation Solution
A strain detection device comprising a flexible base material with multiple insulating layers, four sensor patterns with strain gauges arranged in a specific configuration to face each other with insulating layers in between, and a controller to apply voltage and read detection values, enabling precise detection of curved surfaces by calculating radii of curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single layer of strain gauges is used, then the device structure is simple, but the detection precision of curved surfaces is insufficient
Solution Approach 1:
The sensor pattern is segmented into multiple layers (first sensor pattern and second sensor pattern) with strain gauges arranged at different positions. Each layer detects strain at its specific location, and the controller processes differential values between layers to calculate curvature. This segmentation enables precise curved surface detection while maintaining manageable structural complexity through systematic layering.
Solution Approach 2:
The detection capability is extended from a single plane to multiple layers in the thickness direction. By arranging strain gauges in the first sensor pattern and second sensor pattern at different positions along the thickness direction, the system captures three-dimensional curvature information, transforming two-dimensional surface detection into three-dimensional spatial detection.
2Adaptability or versatility
If multiple strain gauges are arranged on front and back sides, then curved shape detection capability is improved, but the device structure becomes more complex
Solution Approach 1:
The sensor system is divided into functionally distinct first and second sensor patterns, each with strain gauges arranged in specific configurations. The first sensor pattern includes strain gauges at first and second positions, while the second sensor pattern includes strain gauges at third and fourth positions. This segmentation allows versatile curved surface detection through differential measurement while organizing complexity into manageable, systematic layers.
Solution Approach 2:
Multiple strain gauges across different layers serve multiple functions: detecting strain at various positions, determining curvature radius, and characterizing curved surface morphology. The same multi-layer structure can detect different types of curvature (convex, concave, complex geometries) by processing differential values from appropriate gauge combinations, providing universal curved surface detection capability.
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 device achieves high accuracy in detecting curved surface morphologies by utilizing the differential detection of strain gauge values across multiple layers, effectively overcoming previous limitations in sensitivity and precision.
Implementation Method 1
detecting the resistance change of each strain gauge
Data Source
AI summary
According to one embodiment, a strain detection device includes a flexible base material, first, second, third, and fourth sensor patterns on the base material, each including a plural strain gauges provided in a row. First strain gauges of the first sensor pattern, second strain gauges of the second sensor pattern, third strain gauges of the third sensor pattern, and fourth strain gauges of the fourth sensor pattern are arranged facing each other in a thickness direction of the base material. The first and fourth strain gauges are arranged symmetrically with a center position of the base material in the thickness direction, and the second and third strain gauges are arranged symmetrically with the center position of the base material in the thickness direction.