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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Development of temperature imaging using two-line atomic fluorescence.

Paul R Medwell1, Qing N Chan, Peter A M Kalt

  • 1School of Mechanical Engineering, The University of Adelaide, S.A., Australia. paul.medwell@adelaide.edu.au

Applied Optics
|April 10, 2013
PubMed
Summary
This summary is machine-generated.

This study demonstrates nonlinear regime two-line atomic fluorescence (NTLAF) for superior temperature imaging in flames. NTLAF significantly reduces uncertainty and effectively measures temperature profiles, even in the presence of soot.

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Area of Science:

  • Combustion science
  • Thermometry
  • Laser-based diagnostics

Background:

  • Accurate temperature measurement is crucial for understanding combustion processes and soot formation.
  • Conventional two-line atomic fluorescence (TLAF) has limitations in signal strength and uncertainty.

Purpose of the Study:

  • To extend TLAF theory into the nonlinear fluence regime for improved temperature imaging.
  • To demonstrate the capability of nonlinear regime two-line atomic fluorescence (NTLAF) for precise temperature measurements in flames.

Main Methods:

  • Theoretical extension of TLAF from linear to nonlinear excitation regimes.
  • Implementation and validation of NTLAF for temperature profiling in hydrogen, ethylene, and natural gas flames.
  • Comparison of NTLAF measurements with thermocouple data.

Main Results:

  • NTLAF offers superior signal and reduced single-shot temperature uncertainty (100 K) compared to conventional TLAF (250 K).
  • NTLAF accurately resolves temperature profiles across stoichiometric envelopes, with deviations typically under 30 K from thermocouple measurements.
  • NTLAF demonstrates robustness against interferences common in 2D thermometry, particularly in flames with soot.

Conclusions:

  • NTLAF is a powerful advancement for accurate, high-resolution temperature imaging in combustion environments.
  • The technique shows significant potential for studying temperature-soot coupling and other complex flame phenomena.
  • NTLAF overcomes limitations of existing thermometry methods, enabling more reliable flame diagnostics.