Capacitive Sensor Asymmetric Deformation Thermal Stability
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Solution Overview
Problem
Existing sensors face limitations in accurately detecting substances in gases due to temperature-induced deformations affecting electrode distances, leading to unstable capacitance measurements and reduced detection accuracy.
Innovation Solution
A sensor design featuring a structure body with asymmetric deformable and intermediate portions that deform oppositely with temperature changes, maintaining stable electrode distances and incorporating a controller to manage capacitance changes via a resistance layer, allowing for precise detection of gas-borne substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sensor structure is used, then the device is simple, but temperature-induced deformations cause unstable electrode distances and reduced measurement accuracy
Solution Approach 1:
The structure body is divided into multiple segments including a deformable portion and an intermediate portion, each capable of independent deformation. This segmentation allows the deformable portion to respond to temperature changes while the intermediate portion maintains structural stability, thereby preserving measurement accuracy without requiring complete structural redesign.
Solution Approach 2:
The deformable portion is designed with an asymmetric structure where different regions have different deformation characteristics. The first region deforms in one direction while the second region deforms in the opposite direction, creating a balanced compensation effect that stabilizes the overall electrode distance despite temperature variations.
2Measurement precision
If the structure body is made rigid to maintain stable electrode distances, then measurement accuracy improves, but the ability to detect gas-borne substances through deformation is reduced
Solution Approach 1:
The structure body transitions from a completely rigid design to a dynamic design where specific portions are made deformable. The deformable portion can dynamically adjust its shape in response to gas substance interactions, while the intermediate portion maintains relative rigidity to preserve electrode distance stability, achieving both detection capability and measurement precision.
Solution Approach 2:
Different regions of the structure body are assigned different mechanical properties. The deformable portion has high flexibility to respond to gas substances, while the intermediate portion has higher rigidity to maintain structural stability. This local differentiation of material properties allows simultaneous achievement of substance detection and electrode distance stability.
3Device complexity
If the deformable portion deforms uniformly with temperature, then the structure is simple, but electrode distance instability increases due to lack of compensation
Solution Approach 1:
The deformable portion incorporates asymmetric regions that deform in opposite directions in response to temperature changes. This asymmetric design creates a self-compensation mechanism where the deformations of different regions counterbalance each other, maintaining stable electrode distances without requiring complex external compensation systems.
Solution Approach 2:
The intermediate portion acts as a counterbalancing element that offsets the deformations of the deformable portion. When the deformable portion changes shape due to temperature or gas interaction, the intermediate portion provides opposing structural support that stabilizes the overall electrode distance, similar to a counterweight mechanism.
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 sensor achieves improved accuracy in detecting substances by minimizing temperature-induced effects on electrode distances, resulting in more stable and precise capacitance measurements.
Implementation Method 1
with a rise of a temperature, the first deformable surface deforming into one of a concave shape and a convex shape, and the first intermediate surface deforming into an other of the concave shape and the convex shape
Implementation Method 2
a first capacitance between the first fixed electrode and the first movable electrode
Data Source
AI summary
According to one embodiment, a sensor includes a sensor element. The sensor element includes a first base body, a first fixed electrode fixed to the first base body, and a first structure body. The first structure body includes a first fixed portion fixed to the first base body, a first deformable portion supported by the first fixed portion, a first intermediate portion supported by the first deformable portion, and a first movable portion supported by the first intermediate portion. The first deformable portion includes a first deformed facing surface facing the first base body, and a first deformable surface. The first intermediate portion includes a first intermediate facing surface facing the first base body, and a first intermediate surface. The first deformable surface is possible to be deformed depending on a gas included in a space around the first structure body.