Measurement of small gas impurity with application of multichannel diode laser spectroscopy

I. V. Nikolaev; V. N. Ochkin; M. V. Spiridonov; S. N. Tskhai

doi:10.1117/12.802275

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29 April 2008 Measurement of small gas impurity with application of multichannel diode laser spectroscopy

I. V. Nikolaev, V. N. Ochkin, M. V. Spiridonov, S. N. Tskhai

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Proceedings Volume 7006, Lasers for Measurements and Information Transfer 2007; 70060F (2008) https://doi.org/10.1117/12.802275
Event: Lasers for Measurements and Information Transfer 2007, 2007, St. Petersburg, Russian Federation

Abstract

Diode laser spectroscopy with multipass cell and typically three channels are discussed. In the first analytical channel a laser beam goes through multipass cell with a gas sample. In the second base-line recording channel the output laser intensity without absorption is recorded. The third reference channel is used for several additional aims. The information in all channels is used for analyzing and to improve a detection sensitivity. New technique of wavelength modulation is proposed with substation depress of residual amplitude modulation. The technique was applied to measure a background concentrations of NO₂ and ratio of isotopes ¹²CO₂/¹³CO₂ in atmosphere.

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I. V. Nikolaev, V. N. Ochkin, M. V. Spiridonov, and S. N. Tskhai "Measurement of small gas impurity with application of multichannel diode laser spectroscopy", Proc. SPIE 7006, Lasers for Measurements and Information Transfer 2007, 70060F (29 April 2008); https://doi.org/10.1117/12.802275

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