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Optical Engineering

Flame diagnostics by light sheet imaging and by shearing interferometry
Author(s): Harald Philipp; Heribert Fuchs; Ernst Winklhofer; Georg Pretzler
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Paper Abstract

Combustion in a propane/air burner is analyzed by means of imaging molecular constituents present in the plane of a laser light sheet and by recording the local refractive index distribution with a shearing interlerometer. The pulsed illumination with a UV light sheet yields an instantaneous image of the distribution of propane by elastic scattering, and of OH and CH radicals by laser-induced fluorescence. Spectral separation allows simultaneous and separate imaging of elastic and inelastic scattering, thus providing a means to analyze the spatial inter-relation of propane, CH, and OH. In a fuel-rich flame, laser-induced incandescence of soot particles is observed. Calibration of propane concentration levels is achieved by the refractive index measurements, which also help to estimate flame temperatures.

Paper Details

Date Published: 1 May 1993
PDF: 8 pages
Opt. Eng. 32(5) doi: 10.1117/12.133341
Published in: Optical Engineering Volume 32, Issue 5
Show Author Affiliations
Harald Philipp, AVL LIST GmbH (Austria)
Heribert Fuchs, AVL LIST GmbH (Austria)
Ernst Winklhofer, AVL-LIST GmbH (Austria)
Georg Pretzler, Technische Univ. Graz (Germany)

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