CO2 laser-based trace gas detection: a nonintrusive ammonia monitor with subsecond response time

Frans J. M. Harren; Hugo S. M. de Vries; Naim Dam; R. van Haeren; J. Reuss; David H. Parker

doi:10.1117/12.219646

15 September 1995 CO₂ laser-based trace gas detection: a nonintrusive ammonia monitor with subsecond response time

Frans J. M. Harren, Hugo S. M. de Vries, Naim Dam, R. van Haeren, J. Reuss, David H. Parker

Proceedings Volume 2505, Lidar and Atmospheric Sensing; (1995) https://doi.org/10.1117/12.219646
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany

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.

Citation Download Citation

Frans J. M. Harren, Hugo S. M. de Vries, Naim Dam, R. van Haeren, J. Reuss, and David H. Parker "CO₂ laser-based trace gas detection: a nonintrusive ammonia monitor with subsecond response time", Proc. SPIE 2505, Lidar and Atmospheric Sensing, (15 September 1995); https://doi.org/10.1117/12.219646

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