Leak Detection System Using Tracer Gas for Selective Permeability
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Solution Overview
Problem
Current methods for detecting leaks in walls or hollow parts with selective leak tightness, particularly those requiring water tightness under specific conditions, are imprecise and unable to reliably measure small leaks, often requiring lengthy tests or assumptions about reference objects that may not be applicable.
Innovation Solution
A leak detection system using a test liquid circuit with a sealed wall between two test chambers, where the first chamber is pressurized and the second chamber is under vacuum, allowing for the detection of vaporized liquid to measure parameters indicative of leaks, such as pressure variations or flow rates, enabling precise detection of small leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional leak detection methods (air pressure testing, cold water drop test) are used on walls with selective permeability, then the testing process is simple to implement, but the measurement precision is insufficient and cannot detect very small leaks
Solution Approach 1:
The patent introduces a tracer gas as an intermediary substance that passes through the wall under test. The tracer gas serves as a mediator between the liquid on one side of the wall and the detection system on the other side, enabling indirect detection of liquid penetration through selective permeability membranes that would otherwise be impossible to measure directly
Solution Approach 2:
The patent replaces direct mechanical/physical leak detection methods (pressure differential, visual inspection) with a chemical detection system. Instead of mechanically pressing or visually inspecting for leaks, the system uses chemical analysis of tracer gas composition to detect and quantify liquid penetration through the wall
2Reliability
If air pressure testing is used to test impermeability, then the test can be performed on inflatable and deformable fabrics, but the test remains approximate and cannot detect very small leaks
Solution Approach 1:
The patent changes the detection parameter from macroscopic pressure differential to microscopic chemical composition analysis. By measuring the concentration and type of tracer gas molecules that have passed through the wall, the system achieves much higher sensitivity and can detect very small leaks that would be imperceptible through pressure testing alone
3Measurement precision
If cold water drop test is used, then a binary result (leak or no leak) can be obtained quickly, but no information about the degree of leak tightness or its measurement is provided
Solution Approach 1:
The patent implements a continuous feedback measurement system that monitors tracer gas concentration over time. This provides real-time quantitative data about the rate and extent of liquid penetration through the wall, allowing for precise measurement of leak tightness rather than just a binary pass/fail result
Solution Approach 2:
The patent applies tracer gas to the liquid before the actual leak detection test. This preliminary action ensures that if liquid penetrates through the wall, the tracer gas is already present and can be immediately detected, eliminating the need for time-consuming post-test analysis
4Adaptability or versatility
If reference objects with similar characteristics are assumed for air leakage threshold calibration, then water tightness can be presumed from air leakage rate, but the assumption is not reliable and not applicable in many situations
Solution Approach 1:
The patent makes the testing system self-calibrating by using actual measurement data from the specific wall being tested. Instead of relying on predetermined thresholds based on reference objects, the system performs its own calibration by measuring the actual tracer gas transmission characteristics of the specific membrane under test, ensuring reliability for each individual case
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 allows for fast and reliable detection of small liquid leaks in walls or hollow parts with selective permeability, providing precise measurements even for very small leaks, and can be applied to various applications like diving watches and portable electronic devices.
Implementation Method 1
generating by a vacuum production device a pressure level P2 in said test chamber such that said pressure P1 in said injection chamber is higher than the pressure P2 in said test chamber and that any liquid leak from said injection chamber to said test chamber causes the leakage liquid to evaporate in said test chamber
Implementation Method 2
said means being used to detect and/or measure at least one parameter related to a quantity of liquid vapour (vapor) and/or a variation of the quantity of liquid vapor in said second test chamber
Data Source
AI summary
A leak detection device and method for use in testing a wall with selective gas/liquid permeability. The wall is sealed inside a containment including an injection chamber and a test chamber. The injection chamber is in communication with an injection and pressurization source and the test chamber is in communication with a vacuum production device. A vaporized liquid detector is in communication with the test chamber operable to detect and/or measure a parameter related to a quantity of liquid vapor or a variation in the quantity of liquid vapor which is indicative of a leak condition through the wall.