MEMS Sensor Electrode Reuse for Compact Material Detection
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Solution Overview
Problem
Existing MEMS sensors face challenges in efficiently detecting materials in contact or proximity to their casings or coatings without requiring additional space-consuming structures, which is crucial for area-restricted applications.
Innovation Solution
Reusing existing MEMS sensor structures as electrodes for material sensing, enabling contactless measurement of materials using gel coatings and leveraging electric stray fields, while maintaining functionality and protection from environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional electrodes are placed close to potential materials to detect material contact, then material sensing capability is improved, but device area and complexity increase
Solution Approach 1:
The patent reuses existing MEMS sensor structures (pressure sensor membranes, casings, or coatings) to serve dual functions: their original sensing function and as electrodes for material detection. This eliminates the need for additional dedicated electrode structures, thereby maintaining material sensing capability while avoiding increased device area and complexity
Solution Approach 2:
The patent combines the material sensing function with existing sensor structures by integrating electrode functionality into the pressure sensor membrane, casing, or coating. This merging of functions allows material detection without requiring separate additional structures, thus preventing area increase
2Measurement precision
If additional structures are added to the sensor to enable material detection, then material sensing is improved, but device complexity increases
Solution Approach 1:
The patent makes existing sensor structures serve multiple purposes: the pressure sensor membrane acts as both the pressure sensing element and the electrode for material detection. This multi-functionality approach improves material sensing capability without adding structural complexity
Solution Approach 2:
The existing sensor structures serve themselves by functioning as electrodes for material detection without requiring additional dedicated components. The pressure sensor membrane, casing, or coating inherently provides both its original function and material sensing capability, reducing overall device complexity
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
Enables robust material detection without additional structures, protecting electrodes from environmental effects and maintaining sensor accuracy, suitable for applications requiring compact designs.
Implementation Method 1
MEMS sensors may operate on the principle of detecting changes in a measured physical quantity or parameter and converting it into an electrical signal
Implementation Method 2
waterproof sensors may be covered by a thin layer of gel to protect the sensor (MEMS as well as ASIC) against environmental influence
Implementation Method 3
measure the second physical parameter based on an electric stray field between the micro-mechanical sensing element acting as a first electrode of a capacitor and a further component of the MEMS sensor device acting as a second electrode of the capacitor
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a MEMS sensor device (100; 200), comprising at least one micro-mechanical sensing element (110) and measurement circuitry (120; 510; 520; 530) coupled to the at least one micro-mechanical sensing element (110). The measurement circuitry (120; 510; 520; 530) is configured to, during a first operational mode of the MEMS sensor device (100; 200), control the at least one micro-mechanical sensing element (110) to measure a first physical parameter, and, during a second operational mode of the MEMS sensor device (100; 200), control the at least one micro-mechanical sensing element (110) to measure a different second physical parameter.