Index Contrast Imaging for Hydrogen and SF6 Leak Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current gas leak detection technologies, particularly for hydrogen, hydrogen fluoride, and SF6, are expensive and ineffective in distinguishing gas leaks from normal hot air flows, lacking a cost-effective imaging solution that can identify specific gas types without an artificial background screen.
Innovation Solution
A method and system utilizing index contrast imaging with visible cameras to detect gas leaks by analyzing refractive index variations, employing multiple cameras and imagers, and integrating computational fluid dynamics and AI for precise gas identification and localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional IR camera spectroscopy is used for gas leak detection, then detection capability is achieved, but cost becomes expensive and gas-specific identification is lost
Solution Approach 1:
The patent replaces expensive IR camera spectroscopy systems with inexpensive visible light cameras that capture transient refractive index variations. The visible cameras are standard, low-cost devices that can detect gas leaks through index contrast imaging without requiring specialized expensive equipment, thus resolving the cost contradiction while maintaining detection capability
Solution Approach 2:
The patent changes the detection parameter from spectral analysis (IR spectroscopy) to refractive index variation analysis using visible light. By monitoring how gas leaks alter the refractive index of air in the scene, the system achieves gas-specific identification through visible cameras, eliminating the need for expensive IR equipment while improving both cost-effectiveness and gas-specific detection
2Ease of manufacture
If index contrast imaging is used to detect gas leaks, then cost is reduced, but gas-specific identification capability is lost and hot air flow cannot be distinguished
Solution Approach 1:
The patent performs preliminary action by projecting a known dot pattern onto the scene before gas leak detection. This pre-established reference pattern allows the system to later distinguish between patterns caused by hot air flow (which would affect the entire scene uniformly) and patterns caused by specific gas leaks (which would cause localized distortions). The preliminary projection creates a baseline for comparison that enables gas-specific identification
Solution Approach 2:
The patent introduces a dot pattern projection as an intermediary element between the visible camera and the gas leak. This intermediary pattern serves as a probe that interacts differently with hot air flow versus specific gases, allowing the system to distinguish between them through pattern distortion analysis. The dot pattern acts as a mediator that translates invisible refractive index variations into visible, analyzable image data
3Device complexity
If index contrast imaging without artificial background screen is used, then device complexity is reduced, but measurement precision for distinguishing gas types deteriorates
Solution Approach 1:
The patent implements self-service by using the scene itself and naturally occurring light sources (such as ambient lighting or projections) as the background reference, eliminating the need for artificial background screens. The system analyzes refractive index variations relative to the existing scene structure, allowing gas-specific identification without adding complex artificial background elements. The environment serves its own function as the reference framework
Solution Approach 2:
The patent makes the visible camera system universal by enabling it to perform multiple functions: detecting gas leaks, identifying gas types, and operating without artificial background screens. By using standard visible light cameras with dot pattern projection and CFD analysis, the system achieves gas-specific identification capabilities that were previously only available with specialized expensive equipment, thus resolving the contradiction between device simplicity and 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
Enables cost-effective, precise detection and localization of hydrogen, hydrogen fluoride, and SF6 leaks in industrial plants, enhancing safety and reducing environmental impact by distinguishing these gases from other substances and hot air flows.
Implementation Method 1
analyzing image data of a scene in an industrial plant to identify a presence of a unique gas within the scene based on variations in a refractive index of the unique gas relative to surrounding materials
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A method and system for gas leak detection can involve analyzing image data of a scene in an industrial plant to identify a presence of a unique gas within the scene based on variations in a refractive index of the unique gas relative to surrounding materials, wherein the image data of the scene can be captured without an artificial background screen. Variations in the refractive index can be compared with typical index contrast imaging profiles to distinguish the unique gas from other substances within the scene. A signal or notification indicating a presence of a leak of the unique gas within or from the industrial plant can be output when the unique gas is distinguished from the other substances within the scene.