Thermopile Metal Ring Stabilizes Thermal Conductivity
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Solution Overview
Problem
Conventional methods fail to maintain a constant thermal conductivity for the membrane of newly developed thermopiles, which is crucial for maintaining accuracy and reducing sensitivity to environmental changes.
Innovation Solution
A metal ring is formed over the substrate around the thermopile's functional area, comprising multiple metallization layers with thermally conductive layers in between, which are thermally coupled to the substrate, along with a passivation layer and a cover plate to stabilize thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional methods are used for thermopile membrane stabilization, then manufacturing simplicity is maintained, but thermal conductivity stability deteriorates
Solution Approach 1:
The stabilization structure is segmented into multiple metallization layers (first, second, and third metallization layers) with via layers positioned at different locations around the functional area. Each layer and via is segmented to provide distributed thermal conduction paths, ensuring stable thermal conductivity through the substrate while maintaining manufacturing feasibility through standardized layering processes.
2Stability of the object's composition
If the metal ring structure with multiple metallization layers is implemented, then thermal conductivity stability is improved, but manufacturing complexity increases
Solution Approach 1:
The via layers serve multiple functions: they provide thermal conduction paths through the substrate, act as structural anchors for the metallization layers, and facilitate the formation of the metal ring geometry. This multi-functionality reduces the need for additional specialized structures, thereby improving ease of manufacture while maintaining thermal conductivity stability.
Solution Approach 2:
The invention utilizes changes in material parameters by selecting specific materials for the via layers and metallization layers with appropriate thermal conductivities. By adjusting material composition and layer thickness parameters, the thermal conduction characteristics are optimized to stabilize the membrane's thermal conductivity without requiring overly complex manufacturing processes.
3Measurement precision
If the metal ring is thermally coupled to the substrate, then thermal conductivity consistency is improved, but sensitivity to environmental changes worsens
Solution Approach 1:
The metal ring structure with via layers acts as an intermediary thermal management system between the substrate and the membrane. It mediates thermal conduction by providing controlled thermal paths that stabilize the membrane temperature, thereby improving measurement accuracy. The intermediary structure reduces direct sensitivity to environmental temperature fluctuations while maintaining precise thermal coupling where needed.
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 ensures a consistent thermal conductivity for the thermopile, enhancing accuracy and reducing sensitivity to changes in atmospheric pressure and temperature differences.
Implementation Method 1
a metal ring formed over the substrate along the periphery of the functional area, wherein the metal ring is thermally coupled to the substrate
Data Source
AI summary
Here, an apparatus is provided. The apparatus generally comprises a substrate and a thermopile. The thermopile includes a cavity that is etched into the substrate, a functional area that is formed over the substrate (where the cavity is generally coextensive with the functional area), and a metal ring formed over the substrate along the periphery of the functional area (where the metal ring is thermally coupled to the substrate).