MEMS Flow Sensor Layer Layout for Thermal Differentiation
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Solution Overview
Problem
Existing MEMS-based sensors face challenges in achieving high sensitivity and efficient temperature differentiation for flow rate detection due to inefficient heating and heat transfer between conductive and resistance layers.
Innovation Solution
The sensor design incorporates independently stacked conductive and resistance layers with narrower widths and gaps, along with insulating members to minimize heat conduction, allowing for efficient thermal conduction and enhanced temperature differences between layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conductive and resistance layers are stacked closely for efficient heating, then heating efficiency improves, but heat conduction between layers increases causing temperature differentiation to decrease
Solution Approach 1:
The conductive layer and resistance layer are divided into multiple segments along the flow direction, with insulating members placed between segments to block heat conduction paths while maintaining heating efficiency within each segment
Solution Approach 2:
Insulating members are introduced as intermediary elements between the conductive layer and resistance layer to prevent harmful heat conduction while allowing the desired thermal coupling for heating to occur
2Measurement precision
If the width of resistance layers is reduced to improve temperature differentiation, then sensitivity improves, but the area for heat generation and transfer decreases
Solution Approach 1:
The resistance layer width is locally reduced in specific regions to enhance temperature differentiation and sensitivity, while the conductive layer maintains sufficient width to ensure adequate heating capacity through localized heat generation
3Measurement precision
If gaps between layers are increased to reduce heat conduction, then temperature differentiation improves, but heating efficiency decreases
Solution Approach 1:
The gap structure is segmented with insulating members positioned at specific intervals to block heat conduction paths while maintaining optimal gap distances for efficient thermal coupling in heating regions
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 design achieves higher sensitivity and accuracy in detecting fluid flow by effectively utilizing thermal conduction and minimizing cross-layer heat influence, resulting in improved temperature differentiation.
Implementation Method 1
a first conductive layer provided between the base and the first resistance layer... when a first power is supplied to the first conductive layer
Implementation Method 2
effectively utilizing thermal conduction and minimizing cross-layer heat influence
Data Source
AI summary
According to one embodiment, a sensor includes a base, first and second structures. The first structure includes a first fixed portion and a first element portion. The first element portion includes a first resistance layer and a first conductive layer provided between the base and the first resistance layer. The second structure includes a second fixed portion and a second element portion. The second element portion includes a second resistance layer and a second conductive layer provided between the base and the second resistance layer. A first resistance layer width in the second direction of the first resistance layer is smaller than a first conductive layer width in the second direction of the first conductive layer. A second resistance layer width in the second direction of the second resistance layer is smaller than a second conductive layer width in the second direction of the second conductive layer.