Barrier-Layer Strain Gauge for Electromagnetic Noise Shielding
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Solution Overview
Problem
Conventional strain gauges experience noise superimposition on the resistor, which affects their accuracy, particularly in those with a high gauge factor, leading to reduced measurement precision.
Innovation Solution
A strain gauge design incorporating a flexible substrate with a Cr, CrN, and Cr2N film resistor, covered by an insulating layer and a conductive barrier layer, which reduces noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a strain gauge with high gauge factor is used to improve measurement sensitivity, then measurement sensitivity is improved, but noise impact increases significantly leading to decreased measurement accuracy
Solution Approach 1:
The patent introduces a barrier layer as an intermediary component between the resistor and the external environment. This barrier layer specifically targets and blocks electromagnetic waves and static electricity noise from reaching the resistor, thereby reducing noise impact while preserving the high gauge factor and measurement sensitivity of the strain gauge.
Solution Approach 2:
The patent converts the harmful effect of noise into a design consideration by implementing specific protective structures. The barrier layer is designed to block electromagnetic waves and static electricity, transforming the previously harmful noise environment into an opportunity to enhance measurement accuracy through targeted noise filtration.
2Device complexity
If conventional resistor structures are used to simplify the design, then device complexity is reduced, but noise superimposition on the resistor increases leading to measurement errors
Solution Approach 1:
The patent employs a composite structure consisting of multiple layers with different functions: the flexible substrate, the Cr-CrN-Cr2N resistor film, the insulating layer, and the barrier layer. Each layer contributes specific properties, and their combination achieves both noise reduction and maintained measurement accuracy without excessive complexity.
Solution Approach 2:
The patent divides the strain gauge into distinct functional segments: the resistor layer for strain detection, the insulating layer for electrical isolation, and the barrier layer for noise protection. This segmentation allows each component to perform its specific function optimally while keeping the overall structure manageable and not overly complex.
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 design effectively minimizes noise superimposition on the resistor, enhancing the accuracy of strain measurements, especially for highly sensitive gauges with a gauge factor of 10 or more.
Implementation Method 1
a conductive barrier layer covering the insulating layer
Data Source
AI summary
A strain gauge includes a flexible substrate, a resistor on one surface of the substrate, an insulating layer covering the resistor, and a conductive barrier layer covering the insulating layer. The conductive barrier layer includes a first layer portion extending over a surface of the resistor via the insulating layer, and a second layer portion extending over side surfaces of the resistor via the insulating layer and continuously connected to the first layer portion.