Three-Layer Fuel Cell Membrane Thickness Measurement Without Peak Positioning
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Solution Overview
Problem
Existing methods for measuring the thickness of fuel cell reinforcement membranes with a three-layer structure, where layers have the same medium and refractive index, cannot accurately analyze the position of thickness peaks, making it difficult to assess uniformity and symmetry non-destructively.
Innovation Solution
A method involving the input of white light into a fuel cell reinforcement membrane with a three-layer structure, obtaining a light spectrum, and calculating a thickness spectrum to determine the thicknesses of the layers without analyzing peak positions, using reflective light and Fourier transform to identify overlapping peaks indicating equal or similar thicknesses of ion exchange resin layers and a porous film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the power spectrum method is used to measure thickness of layers with same refractive index, then measurement can be performed, but the position of thickness peaks cannot be accurately analyzed
Solution Approach 1:
The patent changes the measurement parameter from power spectrum (which loses position information) to light spectrum (which preserves position information). By analyzing the light spectrum directly instead of converting to power spectrum, the method maintains both thickness measurement capability and position information, resolving the contradiction between measurement capability and information loss.
2Measurement precision
If the position analysis process is performed to determine layer interfaces, then accurate layer positioning is achieved, but measurement time increases
Solution Approach 1:
The patent extracts only the necessary information (thickness values) from the light spectrum without performing the additional step of analyzing peak positions to determine layer interfaces. By taking out only the required thickness measurements directly from the spectrum analysis, the method achieves accurate thickness measurement while eliminating the time-consuming position analysis process.
3Measurement precision
If the three-layer structure is analyzed by determining individual layer positions, then structural symmetry can be assessed, but the measurement process becomes complex
Solution Approach 1:
The patent merges the thickness measurement of all three layers into a single unified light spectrum analysis process. Instead of separately determining the position of each layer interface and then calculating thicknesses, the method combines all thickness information extraction into one integrated spectral analysis, simplifying the measurement process while maintaining the ability to assess structural symmetry.
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
Enables non-destructive, precise measurement of overall thickness uniformity and symmetry of the three-layer structure, improving the stability and reliability of the reinforcement membrane coating process by omitting the need to analyze peak positions and ensuring uniform coating.
Implementation Method 1
a light spectrum of the reinforcement membrane by spectrally analyzing the white light reflected by respective layers of the reinforcement membrane
Implementation Method 2
converting the reflected light into an electrical signal
Data Source
AI summary
The present invention relates to a method of non-destructively measuring a thickness of a reinforcement membrane, and more particularly, to a method of non-destructively measuring a thickness of a hydrogen ion exchange reinforcement membrane for a fuel cell, in which the reinforcement membrane has a symmetric three-layer structure including a reinforcement base layer and pure water layers disposed at opposing sides of the reinforcement base layer, including performing total non-destructive inspection and omitting a process of analyzing a position by means of a thickness peak of a power spectrum of the respective layers of the reinforcement membrane.