Mass Spectrometry Permeation Testing Apparatus
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Solution Overview
Problem
Current methods for testing fluid permeability, particularly in low permeability films like ultra-low permeability films, face challenges in accurately measuring low gas and moisture permeation rates without altering total pressures or requiring complex mathematical corrections.
Innovation Solution
A permeation testing apparatus utilizing a mass spectrometer fluidly coupled to a test cell, with a controller managing the introduction of test and challenge fluids to detect analyte permeation through a test film, maintaining balanced pressures and using pulsed sampling to minimize pressure changes and enhance sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional permeation testing methods are used, then measurement can be performed with simple equipment, but measurement precision deteriorates for low permeability films
Solution Approach 1:
The patent replaces conventional mechanical/gravimetric measurement systems with a mass spectrometer-based detection system. The mass spectrometer uses mass-to-charge ratio separation to detect permeating gas molecules, substituting mechanical balance measurements with spectral analysis, thereby achieving superior measurement precision for ultra-low permeation rates
Solution Approach 2:
The patent introduces a mass spectrometer as an intermediary detection device between the test film and the measurement system. The mass spectrometer acts as a mediator that converts invisible low-concentration gas permeation into detectable mass spectral signals, enabling precise measurement of otherwise undetectable permeation rates
2Measurement precision
If continuous sampling is performed to improve detection sensitivity, then measurement precision improves, but total pressure in the test cavity changes
Solution Approach 1:
The patent implements periodic/pulsed sampling instead of continuous sampling. The mass spectrometer samples the test cavity headspace at discrete time intervals, allowing the system to maintain total pressure stability between samples while still achieving high detection sensitivity through repeated measurements. This periodic action resolves the conflict between sampling frequency and pressure stability
3Reliability
If barrier film performance is improved to ultra-low permeability, then protection capability improves, but measurement difficulty increases
Solution Approach 1:
The patent replaces conventional mechanical detection methods with mass spectrometry, which can detect gas molecules based on their mass-to-charge ratio. This substitution enables detection of ultra-low permeation rates that are below the detection threshold of conventional methods, thereby matching the measurement capability to the improved barrier performance
4Measurement precision
If mathematical corrections are applied to account for pressure changes, then measurement accuracy improves, but device complexity increases
Solution Approach 1:
The patent uses periodic sampling with sufficiently long intervals between samples to allow pressure to stabilize. This temporal separation eliminates the need for mathematical corrections related to pressure changes, as each measurement is taken under stable pressure conditions. The simplicity of this approach avoids complex correction algorithms while maintaining measurement accuracy
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 precise measurement of fluid permeation rates through low permeability films without mathematical corrections, achieving sensitivity to detect permeability rates as low as 10−6 g/m2/day, suitable for ultra-barrier films protecting organic integrated circuits from oxygen and moisture.
Implementation Method 1
a mass spectrometer fluidly coupled to a test cell apparatus... Presence of the analyte indicative of challenge fluid permeation through the test film is detected using the mass spectrometer
Data Source
AI summary
A fluid permeation testing apparatus provides for filling a first cavity of a test cell with a test fluid and filling a second cavity of the test cell with a challenge fluid. The challenge fluid comprises at least one analyte useful for testing permeation of the challenge fluid through a test film that separates the first and second cavities. Samples of the test fluid in the first cavity are introduced to a mass spectrometer, such as in a pulsed manner, without substantially changing the total pressure in first cavity. Samples of the test fluid in the first cavity may be introduced to the mass spectrometer while maintaining substantially balanced total pressures in the first and second cavities.