Discrete Sample Introduction Module for Laser Spectroscopy Dilution
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Solution Overview
Problem
Current gas analyzers using Laser Absorption Spectroscopy struggle to accurately measure gas concentrations beyond their analytical range, particularly for samples from environments like the Earth's surface or ocean floor, leading to inaccurate data on gas sources and emissions.
Innovation Solution
A Discrete Sample Introduction Module (DSIM) is developed to couple with laser spectrometers, enabling controlled dilution of gas samples from parts per million to 100% analyte concentration, allowing precise concentration and isotopic analysis by mixing samples with zero gas within a closed system, using electrically actuated valves and mechanical components to configure internal tubing paths for dilution and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas samples with high analyte concentrations are introduced directly to the laser spectroscope, then the spectroscope can analyze the sample, but the analyte concentration exceeds the analytical range resulting in inaccurate measurements
Solution Approach 1:
The system segments the sample introduction process into multiple pathways: a direct pathway for low-concentration samples and a dilution pathway for high-concentration samples. The DSIM divides the sample stream and introduces it in controlled portions to the spectroscope, enabling accurate measurement across a wide concentration range from parts per million to 100% analyte.
Solution Approach 2:
The DSIM acts as an intermediary device between the sample source and the laser spectroscope. It controls the introduction of sample gas through electrically actuated valves and flow regulators, diluting high-concentration samples with carrier gas before they reach the spectroscope, thereby extending the effective analytical range while maintaining measurement accuracy.
2Productivity
If continuous flow-through methods are used to deliver samples to the spectrometer, then continuous readings can be obtained from ambient air flow, but controlled volumes cannot be used limiting discrete sample analysis
Solution Approach 1:
The DSIM employs electrically actuated valves and flow regulators that dynamically control gas flow paths and rates. The system can switch between continuous flow-through mode for ambient air monitoring and discrete sample injection mode for targeted analysis, adapting its operation mode based on measurement requirements.
3Measurement precision
If discrete samples are loaded into an evacuated chamber before analysis, then discrete sample analysis is enabled, but the system requires complex evacuation and loading procedures increasing analysis time
Solution Approach 1:
The DSIM performs preliminary actions by pre-positioning valves and preparing flow paths before sample introduction. Samples are introduced through a controlled pathway that eliminates the need for chamber evacuation, allowing discrete samples to be analyzed immediately upon introduction without time-consuming preparation steps.
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
The DSIM significantly expands the measurable concentration range of gas analyzers by up to three orders of magnitude, providing accurate and precise data for gas sources and emissions, independent of gas constituent, with high sensitivity and minimal dilution error.
Implementation Method 1
Scientists obtain isotopic data using Laser Absorption Spectroscopy (LAS) methods to identify the concentration of specific gas isotopes by observing how light of specific wavelengths is absorbed
Implementation Method 2
The gas sample to be tested is introduced to the DSIM and mixed with a zero gas at a controlled, fixed volume resulting in dilution from greater than 0 to 99.9%
Data Source
AI summary
A Discrete Sample Introduction Module (DSIM) apparatus includes an internal tubing system to receive into the DSIM apparatus a discrete gas sample having a received concentration. A plurality of valves selectively partitions the internal tubing system to form a plurality of loops corresponding to a plurality of loop volumes to contain the discrete gas sample. The plurality of loop volumes receives a carrier gas to dilute the discrete gas sample to a plurality of preselected dilutions. The DSIM apparatus circulates a given one of the plurality of preselected dilutions for analysis by a spectrometer coupled to the DSIM apparatus.