LBAD - Click to edit Master subtitle style Mar 23rd , 2010...

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Unformatted text preview: Click to edit Master subtitle style Mar 23rd , 2010 Laser Based Aerosol Diagnostics Laser-Based Aerosol Diagnostics Jun Wang Mar 23rd, 2010 ENV 6130 Aerosol Mechanic Mar 23rd , 2010 Laser Based Aerosol Diagnostics Outline Laser Background Theory and Instrumentation Summary References Is there any laser in your life? Source: Xlaserbeam.com 22/45 Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light What is light Electromagnetic radiation of specific wavelength (nm) Properties: Intensity, frequency, polarization, phase, speed, and etc. Basic Unit: Photon Photon Energy E 33/45 Max Planck (1858~1947) Source: Wikipedia Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light 44/45 Light Spectrum Source: SVGbot Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Optics Interaction between light and matter 55/45 {DFAE4B12-054 -46 6-BD04-BA263BA08 16} Light Reflection Refraction Scattering Absorption Emission Spontaneous or Stimulated Emission Mar 23rd , 2010 Laser Based Aerosol Diagnostics Laser L. A. S. E. R. L ight A mplification by S timulated E mission of R adiation 66/45 Mar 23rd , 2010 Laser Based Aerosol Diagnostics Type of Laser By Mode Continuous Wave (CW) Laser Pulsed Laser By Medium Gas Laser ( He:Ne, CO2, Ar:Ion ) Chemical Laser Excimer Laser Solid-State Laser ( Nd: YAG ) 77/45 Mar 23rd , 2010 Laser Based Aerosol Diagnostics Laser Diagnostics Light Scattering ( Rayleigh/Mie ) Raman ( Vibrational /Rotational ) Fluorescence Laser induced Plasma /Laser induced Breakdown 88/45 L a s e r Aerosol Elastic Inelastic Destructive Vs Non-Destructive Mar 23rd , 2010 Laser Based Aerosol Diagnostics What can be measured? Indentify unknown chemical species of aerosol (Peaks at finger print wavelength, Library/Ref) Examine changes in aerosol evolution Chemical ( bond alteration ) Physical ( phase, stress ) Absorbed materials/contaminant on aerosol Quantify concentration (size/number 99/45 Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Scattering (Rayleigh/Mie) Redirection of EM wave when encounters an obstacle or non-homogeneity (Scattering Aerosol). It is NOT a simple bounce of Photon. 1010/45 Hahn, D. W. et al Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Scattering (Rayleigh/Mie) Rayleigh Theory Small, dielectric, non-absorbing, spherical. Mie Theory Spherical, absorbing/non-absorbing, no size bound. 1111/45 Lord Rayleigh Gustav Mie Source: Nobelprize.org Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Scattering (Rayleigh/Mie) Parameters in Rayleigh/Mie Scattering Criteria for Rayleigh Regime <<1, or |m| <<1 1212/45 Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Scattering (Rayleigh/Mie) Parameters in Rayleigh/Mie Scattering 1313/45 Hahn, D. W. et al Mar 23rd , 2010 Laser Based Aerosol Diagnostics Light Scattering (Rayleigh/Mie) Intensities of scattering radiation 1414/45 Scattering Cross Section ( , cm2/sr ) Mar 23rd , 2010 Laser Based Aerosol...
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LBAD - Click to edit Master subtitle style Mar 23rd , 2010...

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