3-wavelength photoacoustic spectrophone for filter-free measurement of aerosol particle light absorption.

摘要: In the present work, a 3-wavelength photoacoustic spectrophone (3-wavelength PAS) was developed for direct and filter-free measurements of wavelength-dependent MAC (mass absorption coefficient) and AAC (absorption Ångström coefficient) of black carbon (BC), volcanic ash samples and environmental particulate matter (PM). MAC of BC was measured for validation and characterization of the 3-wavelength PAS instrument, via comparison with reference measurements. After the validation, MAC of Eyjafjallajökull volcanic ash samples were measured in lab, with a result in good agreement with the value obtained using a reference instrument. The developed 3-wavelength PAS was then deployed to a national campaign for field test via inter-comparison with a reference aethalometer (Magee AE33). Good linear correlations are observed with regression coefficients of R > 0.90. Real-time optical monitoring of …