Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Deflection Spectroscopy of Collected Aerosols Photothermal Deflection Spectroscopy of Collected Aerosols
Aerosol Loading EffectsEvolution aerosol deposition canfollow a Poisson function1009080P (n,λAt)) = ( (λAt) n exp(-λAt)/)/n!Where t is loading time, A issurface area, λ is deposition rateNumber of particles70605040302010Corrected countReal count"Probability that pile-up occurs isP o = 1 - exp(-ga)00 50 100 150Loading Time [s]Where g is a surface extinctioncoefficient, and a is the surfaceparticle density.0.120.10.08Corrected count is given asRSD0.060.04n = n 0 exp(-ga)0.02Where n is the real number and n 0the measured count.00 20 40 60 80 100 120 140Loading Time [s]
Finite Element Analysis Modeling Finite Element Analysis is a tool for numerical solutions to complex differentialequations Comsol Multiphysics v. 3.3 Steps Define sample geometry Specify materials, boundaryconditions, heat sources and sinks Solve problem with rough finiteelement definitions Obtain δT time series Calculate relative photothermalelement Comparison to standardapproximate results
- Page 3 and 4: Chemical Analysis Perspective ofPho
- Page 5 and 6: Apparatuses to DetectPhotothermal H
- Page 7 and 8: Photothermal Detection: ComparisonC
- Page 9 and 10: Further Considerations for Chemical
- Page 11 and 12: Photothermal Detection of Condensed
- Page 13 and 14: PM - Updated RulesUS EPA Fine Parti
- Page 15 and 16: Laboratory-Based Condensed PhaseAer
- Page 17 and 18: Aerosol / Particle Generation Nebul
- Page 19 and 20: Aerosols Generation and SamplingAto
- Page 21 and 22: Size and Number Calibration Aerosol
- Page 23 and 24: IR Laser-Excited Photothermal Defle
- Page 25 and 26: Aerosols Number Concentration100908
- Page 27 and 28: So why are the detection limits so
- Page 29: MOUDI Calibration CurveStage 6 (0.5
- Page 33 and 34: Particle “Crowding” Effect Does
- Page 35 and 36: Results for Substrate Thermal Condu
- Page 37 and 38: Inference from Heat Transport and S
- Page 39 and 40: Future Aerosol Work We need to us a
- Page 41: Acknowledgements Several persons wo
Aerosol Loading EffectsEvolution aerosol deposition canfollow a Poisson function1009080P (n,λAt)) = ( (λAt) n exp(-λAt)/)/n!Where t is loading time, A issurface area, λ is deposition rateNumber <strong>of</strong> particles70605040302010Corrected countReal count"Probability that pile-up occurs isP o = 1 - exp(-ga)00 50 100 150Loading Time [s]Where g is a surface extinctioncoefficient, and a is the surfaceparticle density.0.120.10.08Corrected count is given asRSD0.060.04n = n 0 exp(-ga)0.02Where n is the real number and n 0the measured count.00 20 40 60 80 100 120 140Loading Time [s]
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