Helium Leak Detection Correlation Method
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Solution Overview
Problem
Existing gas leak detection methods face challenges in distinguishing genuine leak signals from interfering signals, particularly on large test objects with multiple leak points and long vacuum system transit times, and require cumbersome handling of heavy test gas cylinders, often necessitating two people for operation.
Innovation Solution
A method utilizing a test gas spray device that records and transmits spraying times to an evaluation unit for correlating measurement signals, employing pulsed test gas delivery and data communication to differentiate between genuine leaks and background noise, allowing for single-person operation and reduced helium consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous test gas spraying is used for leak detection, then the ability to detect leaks is maintained, but it becomes difficult to distinguish genuine leak signals from background noise and interfering signals
Solution Approach 1:
The patent applies periodic pulsed spraying instead of continuous spraying. The control unit activates the spray device in periodic pulses, creating distinct test gas applications separated by intervals. This periodic action allows the evaluation unit to correlate measurement signals with specific spray events, enabling differentiation between genuine leaks (which respond to pulses) and background noise (which remains constant or drifts slowly).
Solution Approach 2:
The patent implements a feedback mechanism where the control unit receives both spray timing information and measurement signals from the detector, correlates them in time, and uses this correlation to determine genuine leaks. The feedback loop enables the system to distinguish true leak signals from interfering signals by analyzing the temporal relationship between spray events and detected gas concentrations.
2Quantity of substance
If heavy test gas cylinders are transported manually for leak detection, then test gas supply is ensured, but operation requires two people and mobility is reduced
Solution Approach 1:
The patent segments the test gas storage system into multiple smaller pressure vessels instead of using one large heavy cylinder. This segmentation allows the system to maintain adequate test gas supply while reducing the weight and size of individual containers, enabling single-person operation and improved mobility without compromising the quantity of test gas available.
Solution Approach 2:
The patent introduces a pressure regulator and control unit as intermediary components between the test gas source and the spray device. These intermediaries manage the test gas flow and pressure, allowing the use of smaller pressure vessels while maintaining sufficient test gas supply for effective leak detection.
3Measurement precision
If test gas is sprayed continuously for extended periods, then comprehensive leak detection is achieved, but helium consumption increases
Solution Approach 1:
The patent uses periodic pulsed spraying instead of continuous spraying to reduce helium consumption. The control unit activates the spray device only during necessary detection intervals in periodic pulses, maintaining comprehensive leak detection coverage while minimizing test gas usage during non-critical periods.
Solution Approach 2:
The patent applies partial action by using brief spray pulses rather than continuous spraying. The pulsed operation provides sufficient test gas application for leak detection during each pulse while avoiding excessive gas consumption that would occur with continuous spraying over extended periods.
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 enhances the accuracy of leak detection by correlating spraying times with measurement signals, reduces helium usage, and enables single-person operation, improving accessibility and reducing interference from background noise and system delays.
Implementation Method 1
the specimen is being evacuated by a vacuum system. This vacuum system includes a vacuum pump for evacuating the specimen
Implementation Method 2
a gas detector for detecting the proportion of test gas in the evacuated gas stream
Data Source
AI summary
A method for testing a gas leak detection device with a test gas spray device (12) and a vacuum arrangement (30) in the form of a helium vacuum leak detector flanged to a test object (20) in the form of a spray-on pin leak, with a vacuum pump (26) for evacuating the test object (20), with a test gas detector (28) arranged downstream of the test object, which determines the test gas fraction in the gas stream evacuated from the test object (20) as a measurement signal, and with an evaluation unit (32) for evaluating the measurement signal, comprises the following steps: spraying the test object (20) with helium, recording at least one point in time of the spraying process with the spray device (12), transmitting the recorded time to the evaluation unit (32), and correlating the transmitted spraying time with the measurement signal by the evaluation unit in order to determine at least the test gas fraction at the respective time of the spraying process.and determining the reaction time of the vacuum arrangement (30).