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Related Concept Videos

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Flame photometry, also known as flame emission spectrometry, is a technique used for the qualitative and quantitative analysis of elements present in a sample using a flame as the source of excitation energy. The concept of flame photometry was realized in the early 1860s by Kirchhoff and Bunsen, who discovered that specific elements emit characteristic radiation when excited in flames. The first instrument developed for this purpose was used to measure sodium (Na) in plant ash using a Bunsen...
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Related Experiment Video

Updated: Jul 8, 2026

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
10:29

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames

Published on: June 1, 2016

Temperature mapping in flames by moire deflectometry.

E Bar-Ziv1, S Sgulim, O Kafri

  • 1Nuclear Research Centre-Negev, P.O. Box 9001, Beer-Sheva 84190, Israel.

Applied Optics
|March 1, 1983
PubMed
Summary
This summary is machine-generated.

Moire deflectometry, using Fourier analysis, effectively maps flame temperature and gas density. This advanced technique overcomes previous video system limitations for combustion analysis.

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Last Updated: Jul 8, 2026

Experimental Methodology for Estimation of Local Heat Fluxes and Burning Rates in Steady Laminar Boundary Layer Diffusion Flames
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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Area of Science:

  • * Physics
  • * Optical Measurement Techniques
  • * Combustion Science

Background:

  • * Moire deflectometry is a powerful optical method for analyzing phase objects.
  • * Previous video-based systems had limitations in accurately capturing flame dynamics.
  • * Understanding flame properties like temperature and density is crucial for combustion research.

Purpose of the Study:

  • * To derive and validate the theory of moire deflectometry using Fourier series.
  • * To develop an improved experimental technique for flame analysis.
  • * To generate a comprehensive map of temperature and gas density in a CH4/air flame.

Main Methods:

  • * Theoretical derivation of moire deflectometry using Fourier series analysis.
  • * Comparison of fringe deviation and intensity measurement methods, favoring fringe deviation for flames.
  • * Development of a pointwise scanning experimental technique to replace video systems.
  • * Interpretation of moire data from a CH4/air flame.

Main Results:

  • * Successful application of moire deflectometry to CH4/air flames.
  • * Generation of a complete map detailing temperature and gas density distribution within the flame.
  • * Demonstrated advantages of the new pointwise scanning technique over previous video systems.

Conclusions:

  • * Moire deflectometry, enhanced by Fourier analysis and pointwise scanning, is a suitable method for flame diagnostics.
  • * The developed technique provides detailed insights into flame temperature and gas density.
  • * This approach offers improvements over existing related techniques for combustion analysis.