Dimensional Fluid Mapping via Multifrequency Thermal Excitation
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Solution Overview
Problem
Current water management systems in proton exchange membrane fuel cells (PEMFCs) face challenges in optimizing hydration levels, as excessive liquid water can lead to performance deterioration, including voltage loss and corrosion, and existing diagnostic techniques like neutron imaging have limited application due to specialized equipment requirements.
Innovation Solution
A dimensional fluid mapping system using a thermal measurement system with a heating device driven by a multifrequency excitation signal and a thermal measuring device to generate a dimensional thermal map, which includes deconvoluting thermal signals to create a multifrequency phase shift map, allowing for non-invasive, in-situ water distribution mapping within PEMFCs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If neutron imaging is used to map water distribution, then measurement precision is improved, but device complexity and cost increase due to specialized equipment requirements
Solution Approach 1:
The patent replaces neutron imaging (a complex mechanical/physical system requiring specialized equipment) with a thermal measurement system that uses temperature mapping to infer water distribution. This substitution maintains measurement capability while eliminating the need for specialized neutron imaging equipment, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to indirectly measure water distribution. Instead of directly imaging water with neutron beams, the system measures temperature fields and uses thermal diffusion characteristics to infer water locations and concentrations, thereby achieving accurate water mapping without complex specialized equipment
2Ease of operation
If optical inspection is used to map water, then ease of operation is improved, but measurement precision deteriorates due to limited penetration depth
Solution Approach 1:
The patent transitions from surface-level optical inspection to three-dimensional thermal field measurement. By measuring temperature distribution throughout the internal cavities and using thermal diffusion characteristics, the system achieves deep internal water mapping capability while maintaining ease of operation, effectively adding a dimensional aspect to the measurement approach
3Device complexity
If single-frequency excitation is used, then device complexity is reduced, but measurement precision deteriorates in detecting features at different depths
Solution Approach 1:
The patent segments the measurement process by using multiple excitation frequencies, where each frequency provides information about features at different depths. This segmentation of the thermal excitation into frequency components allows the system to resolve depth information and detect features at various locations within the internal cavities, improving measurement precision without significantly increasing device complexity
Solution Approach 2:
The patent employs periodic thermal excitation at multiple frequencies to probe the internal structure. By applying periodic heating at different frequencies and analyzing the phase and amplitude responses, the system can distinguish features at different depths, as deeper features respond differently to various excitation frequencies compared to surface features
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 approach enables improved water management in PEMFCs by providing detailed, non-invasive water distribution maps, enhancing performance, durability, and design optimization without the need for specialized equipment, thus addressing the limitations of existing diagnostic methods.
Implementation Method 1
A heating device is configured to apply heat to the first side when driven with a multifrequency excitation signal
Implementation Method 2
A thermal measuring device is configured to record thermal signals emitted from the second side
Implementation Method 3
A controller is configured to receive the thermal signals from the thermal measuring device, to deconvolute the thermal signals to obtain a multifrequency phase shift thermal map
Data Source
AI summary
A dimensional fluid mapping system. An internal fluid device having one or more internal cavities configured to contain a fluid is disclosed. The one or more internal cavities have one or more internal features. The internal fluid device has a first side and a second side opposing the first side. A heating device is configured to apply heat to the first side when driven with a multifrequency excitation signal including first and second frequencies. A thermal measuring device is configured to record thermal signals emitted from the second side. A controller is configured to receive the thermal signals from the thermal measuring device and to generate a dimensional thermal map of one or more internal features of one or more internal cavities and/or an internal fluid distribution of the fluid contained in the one or more internal cavities in response to the thermal signals.