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.

 
Specifications

Concept

Wavelengths

Acoustic resonator

Cell volume

Detection limit

Accuracy & Precision

Aerosol flow

Time resolution

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

 

Customisable wavelength combinations in the 375 nm to 785 nm spectral range (e.g. 405 nm, 515 nm, 660 nm, 785 nm) 

Compact stainless steel cylindrical cavity with a fundamental acoustic frequency of 3180 Hz

236 cm   (including acoustic buffer volumes)

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

15% and 3%

0.5 - 2 lpm

1s sampling rate. 60s typical averaging time per wavelength.

3

-7

3

 
References

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.