Portable long open-path FTIR applied to in-situ measurement of trace gases of ambient air pollution

Tai-Ly Tso; Wen-Chung Liao; Shih-Yi Chang

doi:10.1117/12.59328

1 May 1992 Portable long open-path FTIR applied to in-situ measurement of trace gases of ambient air pollution

Tai-Ly Tso, Wen-Chung Liao, Shih-Yi Chang

Proceedings Volume 1637, Environmental and Process Monitoring Technologies; (1992) https://doi.org/10.1117/12.59328
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

A long open path Fourier-transform infrared (FTIR) system operable at pathlengths up to 1 kilometer has been constructed for the simultaneous detection and measurement of trace pollutant gases in the Taiwan urban air. Good mid-IR spectra at 0.5 cm1 resolution covering most pollutant gases of greater than a few ppbv are recored hourly on full 24 hours bases. The spectral absorptions in the region due to HCOOH, C₂H₄, H₂CO and O₃ are investigated. A good correlation among HCOOH, C₂H₄. and 0₃ is found. On the basis of the kinetics rate information, most formic acid is not formed directly through the oxidation of C₂H₄. by O₃ in the environment of high humidify. This organic acid in the urban air is the dominant form.

Citation Download Citation

Tai-Ly Tso, Wen-Chung Liao, and Shih-Yi Chang "Portable long open-path FTIR applied to in-situ measurement of trace gases of ambient air pollution", Proc. SPIE 1637, Environmental and Process Monitoring Technologies, (1 May 1992); https://doi.org/10.1117/12.59328

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