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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
Published on: February 14, 2014
[Measurement on gas temperature distribution by tunable diode laser absorption spectroscopy]
Ning Li1, Jian-hua Yan, Fei Wang
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China. phoenixkyo@163.com
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|November 4, 2008
Summary
Tunable diode laser absorption spectroscopy (TDLAS) precisely measures gas temperature distribution by analyzing CO absorption lines. Measurement accuracy depends on error reduction and robust physical constraints for reliable temperature mapping.
Area of Science:
- Spectroscopy
- Laser Technology
- Thermodynamics
Context:
- Gas temperature distribution is critical in combustion and industrial processes.
- Accurate temperature measurement is essential for process control and safety.
- Traditional methods can be invasive or lack spatial resolution.
Purpose:
- To introduce the fundamentals of gas temperature distribution measurement using tunable diode laser absorption spectroscopy (TDLAS).
- To present a discretization strategy for gas absorption equations.
- To develop and validate a method for calculating gas temperature distribution using constrained linear least-square fitting.
Summary:
- The study details TDLAS for gas temperature measurement, utilizing CO absorption lines near 6330 cm(-1).
- Simulations show that a 5% measurement error can yield up to 11% relative error in temperature distribution.
- Experimental validation using a two-temperature model demonstrated the method's feasibility with relative path length errors below 7.3%.
Impact:
- Provides a non-intrusive method for spatially resolved gas temperature measurement.
- Highlights the importance of minimizing measurement errors and applying strong physical constraints for accurate results.
- Offers a foundation for advanced process monitoring and optimization in various industrial applications.
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