Gas Sensor Porous Protective Layer Uniformity
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Solution Overview
Problem
Existing gas sensors face challenges in maintaining waterproofing performance, especially when exposed to large amounts of water, which can lead to cracking and reduced accuracy in detecting gas concentrations.
Innovation Solution
A gas sensor element with a porous protective layer having a standard deviation of porosity of 2.3% or less, ensuring reduced thermal shock vulnerability and improved waterproofing by minimizing variations in porosity, thereby enhancing the sensor's ability to operate effectively in wet environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous protective layer is formed on the gas sensor element to prevent cracking, then the waterproofing performance is improved, but the variations in porosity cause thermal shock vulnerability
Solution Approach 1:
The invention controls the porosity parameters of the protective layer by adjusting manufacturing conditions (spray distance, number of coats, material composition) to achieve a standard deviation of porosity of 2.3% or less, thereby resolving the contradiction between waterproofing performance and thermal shock resistance
Solution Approach 2:
The protective layer is formed as a composite structure with controlled porosity characteristics, combining adequate porosity for gas permeability with low porosity variation for thermal stability, achieving both waterproofing and crack prevention functions
2Measurement precision
If the porosity of the protective layer is increased to improve gas detection, then the heat insulating ability is reduced, but this increases cooling effect and cracking risk when moisture adheres
Solution Approach 1:
The invention optimizes the porosity parameter within a specific range (20-60%) and controls its standard deviation (≤2.3%) to balance gas detection capability with thermal stability, preventing excessive cooling effects while maintaining measurement precision
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 solution significantly improves the waterproofing performance of the gas sensor element, reducing the occurrence of cracking and maintaining accurate gas concentration detection even in the presence of moisture, thus addressing the limitations of existing technologies.
Implementation Method 1
the standard deviation of the porosity of the protective layer is 2.3% or less... the volume of partial portions whose porosity is small, i.e., partial portions whose heat insulating ability is low, is small, so that the degree of cooling of the element body when moisture adheres to the gas sensor element is reduced
Data Source
AI summary
A sensor element includes: an element body including an oxygen-ion-conductive solid electrolyte layer; and a protective layer that covers at least part of the element body and is a porous body having a plurality of pores thereinside. The standard deviation of the porosity of the protective layer is 2.3% or less.