Photoacoustic measurements of air pollutant gases with a CO2 waveguide laser

G. A. Zalesskaya; D. L. Yakovlev; D. I. Baranovsky; M. V. Khodin; E. G. Sambor

doi:10.1117/12.238516

22 April 1996 Photoacoustic measurements of air pollutant gases with a CO₂ waveguide laser

G. A. Zalesskaya, D. L. Yakovlev, D. I. Baranovsky, M. V. Khodin, E. G. Sambor

Proceedings Volume 2773, Laser Optics '95: Gas Lasers; (1996) https://doi.org/10.1117/12.238516
Event: Laser Optics '95, 1995, St. Petersburg, Russian Federation

Abstract

The photoacoustic gas analyzer utilizing an industrial carbon-dioxide waveguide laser was presented to quantitatively determine low concentration of gaseous pollutants in real air. The PA resonant H-type cell design was described. By analyzing the dependence of the PA signal on a modulation frequency, the most suitable acoustic resonance was chosen for practical use. The spectrophone characteristic constant A was determined for various carbon-dioxide laser lines which coincided with air pollutants absorption lines. The schematic diagram of the full- automatic PA gas analyzer was considered, and the interconnection of its units was outlined. It is shown that PA gas analyzer concentration characteristic is linear in a wide concentration range overlapping three orders of magnitude; pollutants detection threshold values are considerably less than their utmost admissible concentrations in air of the living zone. An idea of using Stark's modulation at atmospheric gas pressure analysis is examined.

Citation Download Citation

G. A. Zalesskaya, D. L. Yakovlev, D. I. Baranovsky, M. V. Khodin, and E. G. Sambor "Photoacoustic measurements of air pollutant gases with a CO₂ waveguide laser", Proc. SPIE 2773, Laser Optics '95: Gas Lasers, (22 April 1996); https://doi.org/10.1117/12.238516

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