Strain Gauge Electromagnetic Shielding via Conductive Layer
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Solution Overview
Problem
Strain gauges face challenges in achieving high measurement accuracy due to interference from electromagnetic fields, leading to false measurements.
Innovation Solution
A strain gauge design featuring a resistance element sandwiched between two insulation layers, with an electrically conductive layer on the outer insulation layer that shields electromagnetic interference without electrical connection to the resistance element, ensuring the conductive layer fully covers the resistance element and can extend beyond the insulation layers for enhanced shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the resistance element is exposed to electromagnetic fields, then the strain gauge can be kept simple in structure, but measurement accuracy deteriorates due to electromagnetic interference
Solution Approach 1:
An electrically conductive shielding layer is introduced as an intermediary between the resistance element and the external electromagnetic fields. This shielding layer is arranged on the second insulation layer and extends beyond the insulation layers to provide electromagnetic shielding, while the resistance element remains electrically isolated through the insulation layers. The shielding layer acts as a mediator that protects the measurement element without requiring complex structural modifications.
2Measurement precision
If a shielding layer is added to protect against electromagnetic interference, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The strain gauge structure is segmented into distinct functional layers: a first insulation layer for electrical isolation, a resistance element for measurement, a second insulation layer for additional protection, and an electrically conductive shielding layer for electromagnetic protection. Each layer performs a specific function, allowing the shielding capability to be added without fundamentally redesigning the entire structure. The segmented approach enables incremental improvement of measurement accuracy while maintaining manufacturing feasibility.
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 configuration significantly reduces the impact of electromagnetic interference, thereby increasing measurement accuracy and reliability of strain gauge readings.
Implementation Method 1
An electrically conductive layer, which provides shielding for the resistance element, is therefore arranged on the second insulation layer. The electrically conductive layer is not electrically conductively connected to the resistance layer. In this way, electromagnetic rays in the vicinity of the strain gauge can be shielded from the resistance element by the electrically conductive layer
Data Source
AI summary
A strain gauge for measuring force and strain is provided that has reduced susceptibility to interfering electromagnetic fields. The strain gage includes a first insulation layer, which has a top side, a resistance element, which is arranged on the top side of the first insulation layer, a second insulation layer, which is arranged on the resistance element and which is joined to the first insulation layer at least in some sections, and an electrically conductive layer, which is arranged on the second insulation layer.