Measurement of aerosol optical extinction using diode laser cavity ringdown spectroscopy

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Abstract

Accurate measurement of optical extinction of atmospheric aerosols is important for quantifying the direct climate effects of aerosols. A portable cavity ringdown spectrometer utilizing a modulated multimode blue diode laser (linewidth ∼0.2 nm) is developed to measure the aerosol optical extinction. Laboratory generated ammonia sulfate particles (<1 μm in diameter) are characterized, with good agreements between the experimental measurements and Mie theory calculations. An optical extinction detection sensitivity of 0.24 Mm-1 (1σ) is achieved. Measurements of ambient aerosols are also carried out. This study demonstrates the feasibility of a compact, multimode diode laser cavity ringdown spectrometer for sensitive measurements of the optical extinction of atmospheric aerosols. © 2013 The Author(s).

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Liu, Y. D., & Zhang, J. S. (2013). Measurement of aerosol optical extinction using diode laser cavity ringdown spectroscopy. Chinese Science Bulletin, 58(20), 2440–2446. https://doi.org/10.1007/s11434-013-5825-z

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