Modeling of the Signals of an Optical Particle Counter for real Nonspherical Particles
Heintzenberg, Jost and Okada, Kikuo and Trautmann, Thomas and Hoffmann, Peter (2004) Modeling of the Signals of an Optical Particle Counter for real Nonspherical Particles. Applied Optics, 43 (31), pp. 5893-5900.
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An optical particle counter was exposed to atmospheric particles of diameters of 200, 300 and 400 nm. The OPS data were combined with the results of single-particle analysis with a transmission electron microscope (TEM) on samples taken in parallel with the OPC measurements. With a T-matrix-based optical model the measured OPC spectra of scattered light pulses could be approximated with good precision. With an algorithm that simulated the response of the OPC to a given population of model particles derived from the TEM results, average absorption properties of different particle types were retrieved. For mobility sizes of 400nm, higher light absorption was retrieved with the optical model for soot aggregates than for the rest of the morphological particle types. At smaller mobility sizes no compositional information could be derived from the model particles derived from the TEM data. Despite the limited success of the new methodology applied to the present experiment the results encourage the use of OPCs in combination with electrical mobility analyzers to derive more than aerosol-size distributions. With state-of-the-art pulse-height analysis the light-scattering pulses could be resolved with much finer resolution than in the instrument used.
|Title:||Modeling of the Signals of an Optical Particle Counter for real Nonspherical Particles|
|Journal or Publication Title:||Applied Optics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 5893-5900|
|Keywords:||Atmospheric and ocean optics, aerosol detection, instrumentation, measurement, meteorology, Scattering measurements|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||13 Feb 2006|
|Last Modified:||06 Jan 2010 22:38|
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