Photothermal Deflection Spectroscopy of Collected Aerosols

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Potential Interpretation Problems The goal is to have more sensitive real-time detectionfor mass concentration but photothermal deflectionmeasures optical absorption. Particulate matter do not follow Beer’s s Law if they arestacked in layers. Data analysis should account for surfacecoverage. Particulate mass will not follow Beer’s s Law if they areoptically thick. Data analysis should account for varyingoptical extinction. As with most other types <strong>of</strong> photothermal spectrometry,signal may be a function <strong>of</strong> particulate heat capacity andthermal diffusivity
MOUDI Calibration CurveStage 6 (0.56 um)Stage 5 (1 um)Average Mass per Spot [ μ g]0.900.800.700.600.500.400.300.200.100.000 10 20 30 40 50 60Collection Time [min]Nonlinearity is due to surface “saturation”
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: So why are the detection limits so
Page 31 and 32: Finite Element Analysis Modeling Fi
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

Photothermal Deflection Spectroscopy of Collected Aerosols

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