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Proceedings Paper

Chemical oxygen-iodine laser: flow diagnostics and overall qualification
Author(s): Eric Georges; Roger Barraud; Alain Mouthon
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Paper Abstract

Since the first demonstration of a CW oscillation of the chemical oxygen iodine laser ( COIL ) in 1978 reported by McDermott et al. numerous research teams are developing various experimental set-ups and theoretical models. The main goal of these studies is to increase the performances of the laser. To determine the characteristics of each laser component, various accurate and calibrated detectors are used . Concentrations and molar flow rates of all the chemical species are determined experimentally . The measurement systems are presented, especially those applied to the evaluation of the water concentration in the flow : hygroscopic solid hygrometer and laser diode spectroscopy . The experimental data allow an overall qualification of the laser . Furthermore, some of them are used in theoretical models and some others are used to demonstrate the validity of these models. As shown in the data exploitation, a precise value for water content in the flow is essential to compute accurately the cold trap efficiency, the chemical power carried by singlet delta oxygen, and to check the influence of water in the kinetical mechanism. One of the key point to optimise the efficiency of the COIL is to solve the mixing problem of singlet delta oxygen and iodine streams . This can be studied by recording with a video system the visible emission of I2 (B => X) produced during the interaction of O2(1?) and I2, and by processing digitized images .

Paper Details

Date Published: 1 February 1991
PDF: 4 pages
Proc. SPIE 1397, 8th Intl Symp on Gas Flow and Chemical Lasers, (1 February 1991); doi: 10.1117/12.25975
Show Author Affiliations
Eric Georges, ONERA (France)
Roger Barraud, ONERA (France)
Alain Mouthon, ONERA (France)

Published in SPIE Proceedings Vol. 1397:
8th Intl Symp on Gas Flow and Chemical Lasers
Concepcion Maroto Domingo; Jose M. Orza, Editor(s)

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