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.
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Liu, Y., Zhang, J. Measurement of aerosol optical extinction using diode laser cavity ringdown spectroscopy. Chin. Sci. Bull. 58, 2440–2446 (2013). https://doi.org/10.1007/s11434-013-5825-z
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DOI: https://doi.org/10.1007/s11434-013-5825-z