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October 2016
3.1.4 Size particles determination
The Angström coefficient noted Alpha, makes possible to determine the size range
of the measured aerosols. The computation of alpha is described in Appendix 2.4,
The small (Fine) aerosols are similar to smoke and those of large size (Coarse)
are of the "dust" type.
The Calitoo is able to differentiate the fumes of forest fires from the sand of the
Sahara brought by the wind over Europe.
To start the calculations, click on the [Angström] button.
Graphic screen is displayed over the raw data area:
Mathematically, Alpha is the steering coefficient of the slope of the straight line
formed by the decimal logarithms of the AOTs as decimal logarithms of their
wavelength (Also, you can use Neperian logarithms for the two axes).
By placing the mouse pointer
on a point of the AOT graph,
the software displays the
curve log (AOT) on the small
graph.
Example : point 2
The gauge indicates the
type of particles measured
Alpha is the Angström
coefficient.
R² is a coherence indicator
of Alpha.
Summary of Contents for CALITOO
Page 49: ...October 2016 49 4 Appendix...
