Share Email Print
cover

Proceedings Paper

Detection of air pollutant NO2 and the measurement of sound velocity by laser-induced photoacoustic technique
Author(s): Guiyin Zhang; Yidong Jin
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 3 February 2009
PDF: 7 pages
Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571G (3 February 2009); doi: 10.1117/12.811766
Show Author Affiliations
Guiyin Zhang, North China Electric Power Univ. (China)
Yidong Jin, North China Electric Power Univ. (China)


Published in SPIE Proceedings Vol. 7157:
2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications
Anbo Wang; YanBiao Liao; AiGuo Song; Yukihiro Ishii; Xudong Fan, Editor(s)

© SPIE. Terms of Use
Back to Top