TU Dresden Institute of process engineering and environmental engineering Aerosol mobility spectrometry based on diffusion charging Lars Hillemann Andreas Zschoppe Rob Caldow TECHNISCHE UNIVERSITÄT DRESDEN
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TU DresdenInstitute of process engineering and environmental engineering
Aerosol mobility spectrometry based on diffusion charging
Lars Hillemann
Andreas Zschoppe
Rob Caldow
TECHNISCHEUNIVERSITÄTDRESDEN
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Agenda
Motivation
Charging mechanisms
Diffusion charging Modeling - Measurement
Application: New aerosol spectrometer UFP
Comparison to reference
Summary
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Motivation
charging the particlesCharger
Classifierquantifying the concentration classifying into
size classes
Detector
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Charging mechanisms
Particle charging
Field charging
UV-radiation
Diffusion charging
Ion generationRadioactive material
Corona-discharge
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Charging mechanisms
Corona-jet-chargerHewitt-type charger
Aerosol mobility spectrometry based on diffusion charging
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Diffusion charging
Modeling
Transition regime:• limiting-sphere-theory
• Model from Marlow&Brock
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Diffusion charging
Modeling
limiting-sphere-theory
+
flow model in mixing chamber
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Diffusion charging
Measurement
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Diffusion charging
Comparing Measurement - Model
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
Inversion
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
Inversion
46,9
73,2
114,4
178,8
279,4
436,6
682,1
1065
,816
65,3
2602
,140
65,8
6352
,799
26,2
15,647,7
145,5444,1
0
5
10
15
20
25
30
35
40
45
I / N [aA*cm3]
Voltage DMA [V]
Particle size [nm]
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
Inversion
Nonlinear minimization
Least square solution
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
Inversion
Least square solution
Nonlinear minimization
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
minimum size
~ 20 nm
maximum size
~ 800 nm
minimum concentration~ 1000 p/cm3
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
New aerosol spectrometer
Prague Smichov tunnel
Stockholm Hornsgatan
DresdenSchlesischer Platz
AugsburgFriedberger Str.
Prototyp „TOPAS UFP 330“
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Comparison to reference
Validation – test aerosols
Aerosol mobility spectrometry based on diffusion charging
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Comparison to reference
Validation – in the field
Monitoring stationDresden Nord
IFT Leipzig
Aerosol mobility spectrometry based on diffusion charging
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Comparison to reference
TDMPS versus UFP
size channel 100 – 200 nm
Aerosol mobility spectrometry based on diffusion charging
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Comparison to reference
TDMPS versus UFP
size channel 50 – 70 nm
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Comparison to reference
TDMPS versus UFP
size channel 20 – 30 nm
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Summary
diffusion chargerCharger
Classifier
electrometer band-pass DMA
Detector
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Summary
Final Conference « Ultrafine Particles in Urban Air »
23.-24. October 2007 in Dresden
german / english
measurement of ultrafine particleslegislatory framework health effects
more details at:www.ufipolnet.eu
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Summary
Links
T02A048 A. Zschoppe
T13A202 B. Wehner
T13A162 H. Gerwig
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Summary
UFIPOLNET (www.ufipolnet.eu) is financed by the LIFE financial instrument of the European Community under No. LIFE04 ENV/D/000054.
Aerosol mobility spectrometry based on diffusion charging
TECHNISCHEUNIVERSITÄTDRESDEN
Thank you
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