Membrane Inlet for Rapid Dissolved Gas Analysis
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Solution Overview
Problem
Current in situ ratiometric measurement systems for dissolved gases face challenges due to slow equilibration times, poor accuracy, and calibration limitations, especially in dynamic environments like the ocean, where membrane permeability variability and temperature changes complicate precise measurements.
Innovation Solution
A membrane inlet system with a controller that integrates measurement signals to determine analyte concentrations independently of membrane permeability, allowing for rapid and accurate ratiometric measurements by stopping sample flow, receiving permeation flux signals, and integrating them to calculate concentrations, thereby overcoming the limitations of existing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If membrane equilibration analysis is used for dissolved gas measurement, then measurement accuracy can be improved, but equilibration time becomes excessively long
Solution Approach 1:
The system uses periodic sampling and integration of permeation flux signals over time to determine analyte concentrations. By continuously measuring and integrating the flux signals rather than waiting for equilibrium, the system achieves accurate measurements without requiring long equilibration times, thus resolving the contradiction between measurement accuracy and time consumption.
Solution Approach 2:
The system changes the measurement parameter from equilibrium concentration (which requires long time) to permeation flux (which can be measured rapidly). By integrating the flux signals over time, the system obtains concentration information without waiting for equilibration, thereby improving measurement speed while maintaining accuracy.
2Device complexity
If traditional membrane inlet systems are used, then device simplicity is maintained, but measurement accuracy deteriorates due to membrane permeability variability
Solution Approach 1:
The system measures the actual permeation flux through the membrane and uses this feedback information to calculate analyte concentrations. By basing measurements on actual flux data rather than assuming constant membrane permeability, the system compensates for membrane variability and achieves high accuracy without adding complex calibration systems.
Solution Approach 2:
The system uses the membrane's own permeation behavior as the measurement signal. By measuring the flux through the membrane and integrating it over time, the system makes the membrane self-characterizing, eliminating the need for external calibration standards and maintaining device simplicity while improving accuracy.
3Measurement precision
If external calibration standards are used, then measurement accuracy can be maintained, but system complexity and calibration requirements increase
Solution Approach 1:
The system eliminates the need for external calibration standards by using the membrane's own permeation flux as the measurement basis. The analyte concentration is determined by integrating the flux signal over time, making the system self-calibrating and removing the complexity of external calibration 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
This approach enables high-precision, rapid ratiometric analysis of multiple analytes, independent of membrane characteristics, and eliminates the need for external calibration standards, improving measurement speed and accuracy in dynamic environments.
Implementation Method 1
membrane inlets achieve these goals by a simple means... the membrane capillary 114 might be supported by the membrane's inherent strength, itself, or the membrane physical support 120
Implementation Method 2
the membrane physically separates the sample volume form the analysis volume, and the membrane is configured to permeate the plurality of analytes from the sample solution into the analysis volume
Data Source
AI summary
Disclosed is a membrane inlet for chemical analysis with fixed volume sample degassing of a plurality of analytes within a sample solution. The membrane inlet comprises a housing, a membrane within the housing, a sensor, and a controller. The housing includes a sample volume, an analysis volume, an inlet of the sample volume, an outlet of the sample volume, and an exhaust outlet of the analysis volume. The housing is configured to receive a flow of the sample solution through the sample volume, the membrane physically separates the sample volume form the analysis volume, and the membrane is configured to permeate the plurality of analytes from the sample solution into the analysis volume. The sensor is configured to measure a concentration for each of the analytes of the plurality of analytes in the analysis volume.