Functional Layer Gas Diffusion Testing for Internal Defect Detection
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Solution Overview
Problem
Visual inspections of electrochemical cell and sensor membranes and catalyst layers are inadequate as they only detect surface defects, missing internal defects like increased gas permeability.
Innovation Solution
A method involving a test gas diffusion analysis through the functional layer, where a predefined amount of test gas is directed to the first surface and its passage through the layer is quantitatively determined on the second surface, allowing for the detection of defects like holes, density differences, or cracks, using a device with a test gas chamber and detection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection is used to detect defects, then the inspection method is simple and quick, but only surface defects can be detected while internal defects remain undetected
Solution Approach 1:
The patent uses gas diffusion through the functional layer to detect defects. A test gas is introduced on one side of the layer and its passage is measured on the other side. This pneumatic approach enables detection of internal defects such as holes, cracks, and density variations that visual inspection cannot detect, while maintaining operational simplicity.
Solution Approach 2:
The patent changes the measurement parameter from visual observation to quantitative gas diffusion measurement. By measuring the amount, concentration, or flow rate of test gas that passes through the functional layer, the system achieves precise detection of internal defects while keeping the inspection process simple and quick.
2Device complexity
If a fixed-width test gas chamber is used, then the device design is simple, but the analysis is limited to specific areas and lacks adaptability
Solution Approach 1:
The patent employs a movable or adjustable test gas chamber that can be positioned at different locations along the functional layer. This dynamic capability allows the same simple chamber design to analyze various areas of the layer by moving the chamber to different positions, providing both simplicity and adaptability.
Solution Approach 2:
The test gas chamber is designed to serve multiple analysis locations on the functional layer. By making the chamber movable or adjustable, a single chamber structure can perform defect detection across the entire functional layer, achieving universal applicability without increasing device complexity.
3Reliability
If quantitative determination of test gas passage is implemented, then defect detection reliability is improved, but measurement accuracy may be affected by gas diffusion losses
Solution Approach 1:
The patent uses a detection unit to quantitatively measure the test gas that passes through the functional layer. This feedback mechanism provides real-time information about the amount of gas transmitted, enabling reliable defect detection. The system can detect changes in gas passage caused by defects while compensating for normal diffusion losses through calibrated measurements.
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 method enables quick, reliable, and easy detection of defects within the functional layer, ensuring comprehensive analysis without significant technical effort, and the device facilitates continuous and rapid analysis with minimal measurement inaccuracies.
Implementation Method 1
The test gas diffuses through the functional layer and exits the functional layer on the second surface of the functional layer
Data Source
Figure 1~2
AI summary
The invention relates to a method and device for analysing a functional layer (10) of an electrochemical cell or an electrochemical sensor application, wherein the method comprises the following steps: i) conveying a predefined amount of test gas to a first surface (11) of the functional layer (10); and ii) quantitatively determining the amount of test gas passing through the functional layer (10) by means of a detection unit (3) which is arranged on a second surface (12) of the functional layer (10), which second surface is arranged opposite the first surface (11) of the functional layer (10).