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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
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[Improving the temperature robustness of the DOAS based on two-dimensional correlation spectroscopy technology]
Hong-lian Li1, Yong-jie Wei2, Chuan-ming Lü3
1State Key Lab of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. lhl79@tju.edu.cn
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|December 28, 2013
Summary
This study introduces a novel method using two-dimensional correlation spectroscopy to enhance the temperature robustness of Differential Optical Absorption Spectroscopy (DOAS) for accurate real-time monitoring.
Area of Science:
- Atmospheric Chemistry
- Spectroscopy
- Environmental Monitoring
Context:
- Real-time monitoring using Differential Optical Absorption Spectroscopy (DOAS) is susceptible to ambient temperature variations.
- Accurate SO2 measurements are crucial for environmental and industrial applications.
Purpose:
- To develop and validate a novel method for improving the temperature robustness of DOAS technology.
- To enhance the accuracy of SO2 measurements under fluctuating temperatures.
Summary:
- A two-dimensional correlation spectroscopy approach was employed to analyze SO2 absorption cross-sections at varying temperatures.
- The method identified an optimal inversion wavelength range (300.5-310 nm) for improved accuracy.
- Field measurements demonstrated a significant reduction in average error from 22.5% to 9.9% within the optimized range.
Impact:
- The proposed two-dimensional correlation DOAS technology significantly enhances temperature robustness.
- This advancement leads to more accurate and reliable real-time atmospheric measurements, particularly for SO2.
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