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Proceedings Paper

CO2 laser-based trace gas detection: a nonintrusive ammonia monitor with subsecond response time
Author(s): Frans J. M. Harren; Hugo S. M. de Vries; Naim Dam; R. van Haeren; J. Reuss; David H. Parker
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Paper Abstract

We describe a method to increase the tuning rate of a grating-tuned cw CO2 laser by using an intra-cavity ZnSe wedge as a tuning element. The wedge is mounted on a galvo element directly in front of the grating which forms one of the cavity mirrors. Its orientation determines the angle of incidence of the laser radiation on the grating, and can be adjusted thorugh the voltage applied to the galvo element. This allows fast, accurate switching between different laser lines at a switching rate of up to 30 Hz. This technique is useful for on-line background absorption correction in trace gas monitoring and for multicomponent analysis of gas samples.

Paper Details

Date Published: 15 September 1995
PDF: 7 pages
Proc. SPIE 2505, Lidar and Atmospheric Sensing, (15 September 1995); doi: 10.1117/12.219646
Show Author Affiliations
Frans J. M. Harren, Catholic Univ. of Nijmegen (Netherlands)
Hugo S. M. de Vries, Catholic Univ. of Nijmegen (Netherlands)
Naim Dam, Catholic Univ. of Nijmegen (Netherlands)
R. van Haeren, Catholic Univ. of Nijmegen (Netherlands)
J. Reuss, Catholic Univ. of Nijmegen (Netherlands)
David H. Parker, Catholic Univ. of Nijmegen (Netherlands)

Published in SPIE Proceedings Vol. 2505:
Lidar and Atmospheric Sensing
Richard J. Becherer, Editor(s)

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