Background Compensation in Absorption Spectroscopy Gas Sensing
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Solution Overview
Problem
Absorption spectroscopy-based gas sensing systems face limitations in detecting trace gas contaminants due to interfering absorption from background gases, which can lead to reduced detection sensitivity and pose risks to human health, environmental hazards, and increased production costs.
Innovation Solution
A method and apparatus that quantify target analyte concentration by calculating inferred background reference analyte absorption using a background gas adjustment factor, allowing for real-time compensation of background absorption interferences, thereby improving measurement accuracy without requiring complex calibration experiments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If absorption spectroscopy is used to detect trace gas contaminants, then detection capability is provided, but detection sensitivity is reduced due to interfering absorption from background gases
Solution Approach 1:
The patent segments the absorption measurement into two distinct components: target analyte absorption and background gas absorption. By measuring at multiple wavelengths (target wavelength and reference wavelength) and applying separate correction factors, the method isolates and compensates for background interference, thereby restoring detection sensitivity without requiring the target absorption to be completely free of background interference.
Solution Approach 2:
The patent introduces reference wavelength measurements as an intermediary mechanism to indirectly measure background gas absorption. These reference measurements serve as a mediator that allows the system to quantify and subtract background interference from the target wavelength measurements, enabling accurate trace gas detection even in the presence of significant background absorption.
2Measurement precision
If multiple-peak measurements with background compensation are implemented, then measurement accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent performs preliminary calibration to determine correction factors that relate reference wavelength absorption to target wavelength background absorption. These correction factors are pre-established and stored, allowing the system to quickly compensate for background interference during actual measurements without performing complex real-time calculations, thus maintaining high accuracy while minimizing processing complexity.
3Reliability
If trace gas contaminant detection is performed in the presence of background gases, then detection capability is maintained, but reliability is reduced due to inability to sensitively detect critical contaminants
Solution Approach 1:
The patent implements a feedback mechanism where reference wavelength measurements continuously monitor background gas absorption levels. This information is fed back into the calculation process to dynamically adjust and compensate for background interference in the target wavelength measurements, ensuring reliable detection of trace contaminants even when background gas concentrations vary.
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
Significantly reduces the influence of background variations on target gas concentration measurements, enhancing accuracy and simplifying processing resources, and effectively corrects for background analyte absorption even when present at concentrations similar to or greater than the target analyte.
Implementation Method 1
absorption spectroscopy-based gas sensing systems
Implementation Method 2
quantifying a target absorption of light in a gas sample at a target wavelength and a reference absorption of light in the gas sample at a reference wavelength
Data Source
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AI summary
Concentrations of a target analyte in a gas mixture containing one or more background analytes having potentially interfering spectral absorption features can be calculated by compensating for background analyte absorption at a target wavelength used to quantify the target analyte. Absorption can be measured at a reference wavelength (302) chosen to quantify the concentration of the background analyte. Using a background gas adjustment factor or function, the absorption measured at the reference wavelength can be used to calculate absorption due to the background analyte at the target wavelength (304) and thereby compensate for this background absorption to more accurately calculate the target analyte concentration in real or near real time (306). Additional background analytes can optionally be compensated for by using one or more additional reference wavelengths.