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Influence of CO2 Kinetic Cooling Effect on the Phase of Second Harmonic Gas Photoacoustic Signal

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Abstract:

Due to the impact of the CO2 kinetic cooling effect, which is kind of energy transfer between CO2 and N2 molecules, the mixed gas containing CO2, the amplitude of the photoacoustic signal and the detected gas concentration are no longer a linear change, and the signal phase also has been changed. In this study, the energy transfer model between CO2 and N2 molecules in near-infrared band (1～2.2μ) was derived, the influence from CO2 gas with different concentration on photoacoustic signal was discussed, and the relevant experimental tests were made，which showed that the proposed model can scientifically interpret the energy transfer relation between CO2 and N2 molecules and can quantitatively determine the influence from CO2 gas with different concentration on photoacoustic signals excited by mixed gas with including CO2 gas.

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Periodical:

Advanced Materials Research (Volume 662)

Pages:

532-536

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.662.532

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Online since:

February 2013

Authors:

Zhi Ying Wu, Ming Lu, Qing Xu Yu

Keywords:

CO2 Kinetic Cooling Effect, Energy Transfer, Gas Photoacoustic Signal, Relaxation Process

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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