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[Application of FTIR spectra fitting method in retrieving gas concentrations]
Jun Zhu1, Wen-qing Liu, Jian-guo Liu
1Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|January 7, 2006
Summary
This study presents a method for measuring carbon monoxide (CO) gas concentrations using Fourier-transform infrared (FTIR) spectroscopy. The technique achieves high accuracy, with results within 1%-5% of the actual values.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Environmental Monitoring
Context:
- Quantitative analysis of gases is crucial for environmental and industrial applications.
- Fourier-transform infrared (FTIR) spectroscopy offers a non-invasive method for gas detection.
- Accurate measurement of carbon monoxide (CO) is vital due to its toxicity and role in combustion processes.
Purpose:
- To develop and validate a method for retrieving carbon monoxide (CO) gas concentrations.
- To utilize the Non-Linear Least Squares (NLLS) fitting algorithm for quantitative spectral analysis.
- To employ the HITRAN database for calibrating and training FTIR spectral measurements.
Summary:
- A method for gas concentration retrieval using FTIR spectra measurement systems was investigated.
- Quantitative analysis of CO gas was performed using the NLLS fitting algorithm under a WINDOWS operating system.
- The HITRAN database spectra were used for fitting measured FTIR spectra, leading to CO concentration determination with 1%-5% absolute accuracy.
Impact:
- Provides a validated, accurate method for CO gas concentration measurement.
- Demonstrates the effectiveness of NLLS fitting with HITRAN database for FTIR spectral analysis.
- Contributes to advancements in gas sensing technologies for environmental and industrial monitoring.