Arcadis

On the Application of Open-Path Fourier Transform Infrared Spectroscopy to Measure Aerosols: Observations of Water Droplets

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ABSTRACT

This paper proposes the application of Open-Path Fourier Transform Infra-Red (OP-FTIR) spectroscopy to measure aerosols. A preliminary experiment conducted in a standard shower chamber generated a condensed water aerosol cloud. The OP-FTIR beam acquired spectra through the cloud of water droplets. We matched calculated extinction spectra to measured extinction in the spectral range between 500 and 5000 wavenumbers by using Mie theory for spherical particles. The results indicate that size distribution parameters may be retrieved from OP-FTIR spectra acquired over a 1 km optical path with reasonable detection limits on the order of 10 micrograms·m-3 for aerosols with optical properties equivalent to water.

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