Articles | Volume 13, issue 12
Atmos. Meas. Tech., 13, 7097–7111, 2020
https://doi.org/10.5194/amt-13-7097-2020
Atmos. Meas. Tech., 13, 7097–7111, 2020
https://doi.org/10.5194/amt-13-7097-2020

Research article 23 Dec 2020

Research article | 23 Dec 2020

A single-beam photothermal interferometer for in situ measurements of aerosol light absorption

Bradley Visser et al.

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Short summary
Here we report on the development of a novel single-beam photothermal interferometer and its use in the measurement of aerosol light absorption. We demonstrate how light-absorbing gases can be used to calibrate the instrument and how this absorption is automatically subtracted during normal operation. The performance of the instrument is compared to a standard filter-based instrument using a black carbon test aerosol. The 60 s detection limit is found to be less than 10 Mm-1.