DCR Gas Absorbance Analysis Using Dual Wavenumber Filters
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Solution Overview
Problem
Current absorbance analysis methods, such as NDIR, face challenges in accurately measuring the concentration and flow rate of DCR gas in mixed gases with CO due to overlapping absorption spectra, making it difficult to isolate and calculate DCR gas concentrations accurately.
Innovation Solution
An absorbance analysis apparatus utilizing a DCR filter and a CO filter to separate absorbance peaks, with an interference estimation and correction mechanism to accurately calculate DCR gas volume by distinguishing between DCR and CO gas absorbances, employing specific wavenumber domains to minimize interference and enable precise concentration measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NDIR method is used to measure DCR gas concentration in mixed gas with CO, then the measurement can be performed, but the measurement precision deteriorates due to overlapping absorption spectra
Solution Approach 1:
The patent segments the absorption spectrum analysis into two distinct wavelength domains: a first wavelength domain centered on the DCR absorption peak and a second wavelength domain centered on the CO absorption peak. By measuring absorbance in both domains separately and processing them through specific calculation steps, the patent isolates the DCR signal from CO interference, thereby resolving the spectral overlap problem and improving measurement precision.
2Measurement precision
If optical filters are used to separate absorbance wavelengths, then the interference from CO can be reduced, but the device complexity increases
Solution Approach 1:
The patent employs a single broadband infrared light source that simultaneously provides illumination for both the first wavelength domain (DCR peak) and the second wavelength domain (CO peak). This multi-functional approach allows one light source to serve dual purposes in detecting both gases, avoiding the need for separate light sources or complex filter assemblies, thereby reducing device complexity while maintaining absorbance separation 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 accurate calculation of DCR gas concentration and partial pressure by isolating DCR gas absorbance from CO gas interference, improving measurement accuracy and reliability in mixed gas environments.
Implementation Method 1
a DCR filter that is configured to transmit a light in a first wavenumber domain including an absorbance peak of the DCR gas
Implementation Method 2
a CO filter that is configured to transmit a light in a second wavenumber domain that is the absorbance wavenumber domain of the CO gas
Implementation Method 3
It can be conceived that the NDIR (Non Dispersive infrared) method is used for measuring the concentration of the DCR gas
Data Source
AI summary
In order to provide an absorbance analysis apparatus for DCR gas that can measure a concentration of a DCR gas by separating absorbance of the DCR gas alone even in a mixed gas consisting of the DCR gas and CO gas whose absorption spectrum overlaps each other, the absorbance analysis apparatus for DCR gas comprises a DCR filter 31 that is configured to transmit a light in a first wavenumber domain including an absorbance peak of the DCR gas, a CO filter 32 that is configured to transmit a light in a second wavenumber domain that is different from the first wavenumber domain, and a DCR gas volume calculator 4 that is configured to calculate volume of the DCR gas based on a first absorbance measured by the light transmitted through the DCR filter 31 and a second absorbance measured by the light transmitted through the CO filter 32.