Stress Sensor With Intermediate Layer for Detection Accuracy
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Solution Overview
Problem
Conventional stress sensors using diaphragms for pressure detection face limitations in accurately measuring stress due to the direct contact between the sensitive membrane and the diaphragm, which results in inadequate stress concentration and detection accuracy.
Innovation Solution
The introduction of an intermediate layer with a Young's modulus between that of the diaphragm and the sensitive membrane, enhancing stress concentration at the contact region with piezoresistive elements, improves detection accuracy by increasing the stress applied to the diaphragm when the sensitive membrane adsorbs substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitive membrane is disposed directly on the diaphragm, then the device complexity is reduced, but the measurement precision deteriorates due to inadequate stress concentration
Solution Approach 1:
An intermediate layer with intermediate Young's modulus is introduced between the diaphragm and sensitive membrane. This intermediate layer acts as a stress concentration mechanism, amplifying the stress applied to the diaphragm when the sensitive membrane adsorbs substances, thereby improving measurement precision without requiring direct contact between the sensitive membrane and diaphragm
2Measurement precision
If an intermediate layer is introduced to enhance stress concentration, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The intermediate layer's Young's modulus is specifically designed to be between that of the diaphragm and sensitive membrane. By controlling this physical parameter, the system achieves optimal stress concentration and amplification effects, improving measurement precision while maintaining a relatively simple three-layer structure
3Measurement precision
If the detector is disposed in the contact region with the intermediate layer, then the measurement precision improves through enhanced stress concentration, but the ease of manufacture deteriorates
Solution Approach 1:
The detector is specifically positioned in the contact region between the diaphragm and intermediate layer, where stress concentration is maximized. This localized placement optimizes the detection of stress changes while the intermediate layer's mechanical properties ensure that this region experiences the highest stress amplification during substance adsorption
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 leads to improved detection capability by increasing the stress applied to the contact region, resulting in greater changes in resistance of the piezoresistive elements and enhanced detection accuracy for substances adsorbed by the sensitive membrane.
Implementation Method 1
a first detector (40) disposed in a region of the diaphragm in contact with an outer edge of the intermediate layer
Implementation Method 2
when the sensitive membrane adsorbs substances
Data Source
AI summary
A stress sensor comprises: a diaphragm; an intermediate layer disposed on a surface of the diaphragm; a sensitive membrane disposed on the intermediate layer; and a piezoresistive element disposed in a region of the diaphragm in contact with an outer edge of the intermediate layer.