Basic Calculations - MAGEE Scientific Aethalometer AE33 User Manual

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Aethalometer
Model AE33

5.1 Basic calculations

The determination of the Black Carbon concentration is based on the measurement of light
absorption on a filter loaded with aerosols:
Light source
Optical attenuation:
Flow:
Attenuation coefficient:
Absorption coefficient:
Black carbon concentration:
Loading effect compensation:
Final equation:
____________________________________________________________________________________________________________
User's manual – Ver. 1.55
Optical detectors
Filter
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*to get correct ATN, ATN0 must be subtracted from calculated ATN value
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July 2017
Reference I
Sensing I
I
= reference signal;
(*)
⁄ )
0
0
I = spot signal
= measured flow
��
������⁡
��⁡= leakage factor
)
S = spot area; t = time
C = multiple scattering parameter
(Weingartner et al. 2003)
⁡= mass absorption cross-section
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������
( 1 − �� ∗ ������ )
k = compensation parameter
)
100
1
) ∗Δ��
1
0
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