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Related Concept Videos

Flame Photometry: Overview

Flame Photometry: Overview

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...

Flame Photometry: Lab

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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IR Spectrometers

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Related Experiment Video

Updated: Jun 19, 2026

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

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Two-dimensional temperature determination in sooting flames by filtered Rayleigh scattering.

D Hoffman, K U Münch, A Leipertz

|October 30, 2009

Summary

Researchers developed filtered Rayleigh scattering for 2D temperature measurements in sooting flames. This advanced technique improves upon standard Rayleigh methods by reducing background noise and enabling measurements in particle-laden gas combustion.

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

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Area of Science:

Combustion science
Optical diagnostics
Thermometry

Background:

Standard Rayleigh scattering for temperature measurements faces challenges with background noise and particle interference.
Accurate two-dimensional (2D) temperature mapping in sooting flames is crucial for understanding combustion processes.

Purpose of the Study:

To introduce and validate a novel filtered Rayleigh scattering technique for 2D thermography.
To overcome limitations of standard Rayleigh scattering in challenging combustion environments.

Main Methods:

Implementation of spectral filtering to suppress background light.
Application of the filtered Rayleigh scattering technique for 2D temperature measurements in a sooting flame.

Main Results:

Successful demonstration of filtered Rayleigh scattering for temperature measurements in a sooting flame.
Suppression of background light from walls and windows was achieved.
Detection of 2D Rayleigh intensity distributions in the presence of small particles was enabled.

Conclusions:

Filtered Rayleigh scattering is a promising advancement for 2D thermography in gas combustion.
The technique offers improved accuracy and applicability in particle-laden and high-background environments.