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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.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Modeling of the Signals of an Optical Particle Counter for real Nonspherical Particles
AuthorsInstitution or Email of Authors
Heintzenberg, JostUNSPECIFIED
Trautmann, ThomasUNSPECIFIED
Hoffmann, PeterUNSPECIFIED
Journal or Publication Title:Applied Optics
Refereed publication:Yes
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 (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
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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