Hear your absorption
PAAS optic free web.jpg

A direct way of measuring the aerosol absorption coefficient using the photo acoustic effect. Measurements at up to four wavelengths enable a specific characterisation of the aerosol.




Acoustic resonator

Cell volume

Detection limit

Accuracy & Precision

Aerosol flow

Time resolution (typ.)

Specific detection of the aerosol absorption coefficient on airborne particles in a single photoacoustic cell at multiple wavelengths


405 nm, 473 nm, 515 nm, 660 nm (other wavelengths possible on request)

Compact stainless steel cylindrical cavity with a fundamental acoustic frequency of 3200 Hz

236 cm   (including acoustic buffer volumes)

< 5∙10   1/m  @ 60s aver. time  (approx. 50 ng/m  Black Carbon)

5% and 3%

0.5 - 2 lpm

1 s





Linke, C., Ibrahim, I., Schleicher, N., Hitzenberger, R., Andreae, M. O., Leisner, T., and Schnaiter, M., "A novel single-cavity three-wavelength photoacoustic spectrometer for atmospheric aerosol research", Atmospheric Measurement Techniques, 9, 5331-3346, 2016, doi:105194/amt-9-5331-2016.

Schnaiter, M., Linke, C., Ibrahim, I., Kiselev, A., Waitz, F., Leisner, T., Norra, S., and Rehm, T., "Specifying the light-absorbing properties of aerosol particles in fresh snow samples, collected at the Environmental Research Station Schneefernerhaus (UFS), Zugspitze.", Atmospheric Chemistry and Physics, 19, 10829-10844, 2019, doi:10.5194/acp-19-10829-2019.