Leak Detection Chamber With Adiabatic Noise Cancellation
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Solution Overview
Problem
Existing leak detection methods struggle to accurately test for leaks at production line rates with desired specificity and feasibility, particularly when dealing with small leaks and temperature fluctuations that affect pressure decay measurements.
Innovation Solution
The apparatus and method employ an adiabatic noise cancellation system to stabilize temperature by creating an adiabatic noise cancelling condition, using an infrared reflective barrier and thermal insulating pad to minimize heat transfer, and a controller to determine pressure decay rates for precise leak detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional leak detection methods are used, then leak detection capability is achieved, but temperature-induced errors affect measurement precision
Solution Approach 1:
The system performs preliminary heating of the test specimen before the actual leak detection measurement. This preliminary action stabilizes the temperature of the specimen, preventing temperature-induced pressure changes during the measurement phase, thereby improving measurement precision.
Solution Approach 2:
The system introduces a reference chamber that acts as an intermediary to compensate for temperature effects. By comparing pressure changes in the test chamber against the reference chamber, the system eliminates temperature-induced errors from the leak detection measurement.
2Productivity
If production line rate testing is implemented, then productivity increases, but testing specificity decreases
Solution Approach 1:
The system performs preliminary temperature stabilization and baseline pressure establishment before each rapid sequential test. This allows the system to maintain high measurement precision even when conducting tests at production line speeds, eliminating the trade-off between speed and accuracy.
3Reliability
If vacuum pumping is used to detect leaks, then leak detection capability is achieved, but adiabatic heating causes temperature fluctuations
Solution Approach 1:
The system pre-heats the test specimen to the target temperature before initiating vacuum pumping for leak detection. This preliminary heating ensures that the specimen is already at thermal equilibrium, so the subsequent vacuum process does not cause significant temperature fluctuations that would affect measurement reliability.
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 significantly reduces temperature-induced errors in leak testing, enabling reliable and repeatable detection of small leaks, even under varying environmental conditions, by stabilizing temperature and minimizing heat exchange during the test cycle.
Implementation Method 1
an infrared reflective barrier disposed between the test specimen and at least a portion of the chamber to reduce infrared radiation heat transfer between the test specimen and the chamber
Implementation Method 2
a thermal insulating pad to support the test specimen in a test position and to reduce conduction heat transfer between the test specimen and the chamber
Implementation Method 3
the controller to control the adiabatic noise cancellation valve to cause the vacuum pump to draw a vacuum from a space between the test specimen and the chamber thereby creating an adiabatic noise cancelling condition in which a temperature of the test specimen is stabilized
Data Source
AI summary
An apparatus for automatic leak detection, including a chamber to enclose a test specimen. A vacuum pump is in selectable fluid communication via an adiabatic noise cancellation valve with the chamber. A pressure transducer determines a pressure in the test specimen and transmits a pressure signal to a controller. The controller is to control the adiabatic noise cancellation valve to cause the vacuum pump to draw a vacuum from a space between the test specimen and the chamber thereby creating an adiabatic noise cancelling condition in which a temperature of the test specimen is stabilized. The controller is to control a flow of a test gas into the test specimen, and to determine a pressure decay rate from the pressure signal. The controller is to determine if the test specimen meets a leak test specification based on the pressure decay rate under the adiabatic noise cancelling condition.