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Solving the overlapped absorbance profile in gas detection by Lorentz distribution solution based on direct
Linquan Lai1, Kaiwen Yin1, Jiale Tang1
1Department of Electronic Engineering, Xiamen University, Xiamen 361005, China.
Summary
A new Lorentz distribution solution (LDS) method accurately extracts gas concentration from incomplete absorbance profiles. This direct absorption spectroscopy technique significantly reduces errors compared to conventional methods.
Area of Science:
- Spectroscopy
- Analytical Chemistry
- Physical Chemistry
Background:
- Direct absorption spectroscopy (DAS) often faces challenges with incomplete absorbance profiles.
- Extracting accurate gas concentration from overlapped spectral data is difficult.
Purpose of the Study:
- To introduce and validate a novel Lorentz distribution solution (LDS) method for gas concentration extraction.
- To address the limitations of conventional DAS in handling incomplete absorbance profiles.
Main Methods:
- Experimentally demonstrated a new LDS method using the ratio of integrals of Lorentzian profiles.
- Developed a formulation and detection procedure for the LDS technique.
- Applied the method to extract gas concentration from various overlapped absorbance profiles and concentrations.
Main Results:
- The LDS method significantly minimized maximum relative errors in gas concentration extraction from 25.55% to 2.64%.
- Gas concentrations obtained by LDS showed a strong linear relationship.
- Conventional DAS (C-DAS) results exhibited significant deviations.
Conclusions:
- The novel LDS method effectively overcomes challenges in gas concentration extraction from incomplete absorbance profiles.
- LDS offers superior accuracy and linearity compared to C-DAS for spectral analysis.
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