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Series in Quantum Electronics
edited by
Henry Baltes, Peter Günter, Ursula Keller,
Fritz K. Kneubühl
= , Walter Lukosz,
Hans Melchior, Markus W. Sigrist

Vol. 31

Anna Stampanoni Panariello

Laser-Induced Gratings in the Gas Phase:
Formation Mechanisms and Applications for Diagnostics
1st edition / 1. Auflage 2003, 98 pages / Seiten, € 64,00. ISBN 3-89649-855-X

The dominant grating formation processes in the gas phase are electrostriction and collisional relaxation of the absorbed laser energy. In this work the potential of laser-induced transient gratings for the diagnostics in the gas phase is demonstrated. The technique is applied to measure nonintrusively temperatures of premixed CO/O2 and of methane/air flames in the pressure range between 1 and 25 bar. Laser-induced electrostrictive gratings were used as well to determine air temperatures in a furnace at atmospheric pressure up to 1400 K. In addition laser-induced electrostrictive gratings are used for the simultaneous, instantaneous, nonintrusive and remote determination of flow velocity and temperature in a submerged air jet at atmospheric pressure, and for concentration measurements of binary gas mixtures of known temperature. Moreover, the potential of the laser-induced grating technique for imaging purposes is demonstrated by visualizing a helium flow in air and to map the concentrations of particles in a sooty acetylene/air diffusion flame. The induced density variation is calculated by solving the linearized hydrodynamic equations. The contributions from electrostriction, instantaneous and slow relaxation of the absorbed radiation energy into heat are given explicitly.

Series in Quantum Electronics

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