Articles | Volume 15, issue 12
Atmos. Meas. Tech., 15, 3805–3825, 2022
https://doi.org/10.5194/amt-15-3805-2022
Atmos. Meas. Tech., 15, 3805–3825, 2022
https://doi.org/10.5194/amt-15-3805-2022
Research article
27 Jun 2022
Research article | 27 Jun 2022

A dual-wavelength photothermal aerosol absorption monitor: design, calibration and performance

Luka Drinovec et al.

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Short summary
A new photothermal interferometer (PTAAM-2λ) for artefact-free determination of the aerosol absorption coefficient at two wavelengths is presented. The instrument is calibrated with NO2 and polydisperse nigrosin, resulting in very low uncertainties of the absorption coefficients: 4 % at 532 nm and 6 % at 1064 nm. The instrument’s performance makes the PTAAM-2λ a strong candidate for reference measurements of the aerosol absorption coefficient.