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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Infrared band model technique for combustion diagnostics.

L E Brewer, C C Limbaugh

|February 2, 2010

Summary

This summary is machine-generated.

This study presents an optical method to measure temperature and water vapor concentration in flames. The technique uses radiance and transmissivity measurements for combustion analysis.

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Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

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Area of Science:

Combustion diagnostics
Optical thermometry
Spectroscopic analysis

Background:

Accurate measurement of temperature and species concentration is crucial for understanding combustion processes.
Existing methods may have limitations in spatial resolution or applicability to radiating sources.

Purpose of the Study:

To develop and validate an optical method for determining radial temperature and water vapor concentration profiles.
To apply radiative transfer equations within a random band model framework.
To utilize a numerical iterative technique for data inversion.

Main Methods:

Formulation of radiance and transmissivity equations using the random band model.
Assumption of constant line widths and delta-function distribution for line strengths.
Development of a numerical iterative technique to solve for temperature and water vapor concentration.
Utilizing literature data for band model parameters.

Main Results:

Successful development of an analytical treatment for optical property determination.
Demonstration of a numerical method for inverting spectral measurements.
Validation of the analytical approach using experimental data from a hydrogen-air burner.

Conclusions:

The presented optical method provides a viable approach for non-intrusive measurement of temperature and water vapor.
The technique is applicable to radiating, cylindrically symmetrical combustion sources.
Experimental verification confirms the accuracy of the developed analytical and numerical methods.