Metal Oxide Hydrogen Sensor With Via-Based Heat Dissipation
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Solution Overview
Problem
Existing heat conduction gas sensors, such as those disclosed in Japanese Unexamined Patent Application Publication No. 2018-119846, consume high power and have low accuracy in detecting hydrogen.
Innovation Solution
A hydrogen sensor design featuring planar electrodes with a metal oxide layer and vias connected to terminals and heat dissipation portions, which includes vias above and below the electrodes to dissipate heat and maintain a constant current for accurate hydrogen detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a heat conduction gas sensor is heated to several hundred degrees Celsius to detect gas, then gas detection capability is improved, but power consumption increases to around 100 mW
Solution Approach 1:
The patent changes the operating temperature parameter from several hundred degrees Celsius to a lower temperature range, enabling hydrogen detection without high-temperature heating. This parameter change resolves the contradiction by achieving detection capability at reduced power consumption levels.
Solution Approach 2:
The patent replaces the thermal-based detection mechanism with an electrical resistance-based mechanism using a metal oxide layer. Instead of relying on heat conduction changes at high temperatures, the sensor detects hydrogen through resistance changes in the metal oxide layer, eliminating the need for high-power heating.
2Ease of operation
If a heat conduction gas sensor is used to detect hydrogen, then gas detection function is provided, but detection accuracy is low
Solution Approach 1:
The patent uses a metal oxide layer as the active sensing material, which provides superior hydrogen detection accuracy compared to traditional heat conduction sensor materials. The metal oxide layer's specific properties enable high-precision hydrogen detection while maintaining operational simplicity.
3Loss of energy
If vias are provided to connect heat dissipation portions, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the electrode structure into multiple segments with separate vias for signal transmission and heat dissipation. This segmentation allows independent optimization of heat dissipation pathways without complicating the overall device architecture, as the vias are integrated into the existing multi-layer structure.
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 low-power consumption and high accuracy in detecting hydrogen by effectively dissipating heat and maintaining a stable current, reducing power consumption to several tens of mW while enhancing detection sensitivity.
Implementation Method 1
a metal oxide layer interposed between the two facing surfaces of the first electrode and the second electrode and having the resistance value that is changed by the exposed portion being exposed to the gas
Implementation Method 2
a heat dissipation portion spaced apart from each other; one or more third vias that are provided above the second electrode and are in contact with the heat dissipation portion
Data Source
AI summary
A hydrogen sensor includes a first electrode that is a planar electrode; a second electrode that is a planar electrode facing the first electrode and includes an exposed portion to be exposed to a gas containing hydrogen; a metal oxide layer disposed between the two facing surfaces of the first electrode and the second electrode and having the resistance value that is changed by the exposed portion being exposed to the gas; a first terminal, a second terminal, and a heat dissipation portion spaced apart from each other; one or more first vias provided above the second electrode and electrically connected to the first terminal and the second electrode; one or more second vias provided above the second electrode and electrically connected to the second terminal and the second electrode; and one or more third vias above the second electrode and in contact with the heat dissipation portion.