Detection of air pollutant NO2 and the measurement of sound velocity by laser-induced photoacoustic technique

Guiyin Zhang; Yidong Jin

doi:10.1117/12.811766

2 February 2009 Detection of air pollutant NO2 and the measurement of sound velocity by laser-induced photoacoustic technique

Guiyin Zhang, Yidong Jin

Author Affiliations +

Proceedings Volume 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 71571G (2009) https://doi.org/10.1117/12.811766
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

The PA absorption property of NO₂ is tentatively surveyed under the condition of room temperature. Laser radiation of 438.0nm is used as excitation source. It is shown that owing to the enhancement of V-T transfer energy with buffer gas pressure, the intensity of the PA signal increases when the pressure of NO₂ maintains at 665Pa and the pressure of the buffer gas is increased. But the PA signal is almost invariable when the buffer gas pressure is more than 3×10⁴Pa. The quantity of NO₂ is changeless are responsible for this phenomena. The PA signal shows itself as linearity variation with NO₂ concentration. Trace concentrations of NO₂ are detected under ambient conditions. The detection limit of 6.4ppm is obtained on the basis of SNR=1 with the homemade apparatus. But one can expect much lower value of the detection limit of this method by improving the detection setup. The velocity of the sound in NO₂ gas is measured from the PA signal. It is about 270m/s. It also finds that the sound velocity varies slightly with the buffer gas pressure.

Citation Download Citation

Guiyin Zhang and Yidong Jin "Detection of air pollutant NO2 and the measurement of sound velocity by laser-induced photoacoustic technique", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571G (2 February 2009); https://doi.org/10.1117/12.811766

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