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        Particle habit imaging using incoherent light : a first step toward a novel instrument for cloud microphysics

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        Author
        Schoen, Roland
        Schnaiter, Martin
        Ulanowski, Zbigniew
        Schmitt, Carl
        Benz, Stefan
        Moehler, Ottmar
        Vogt, Steffen
        Wagner, Robert
        Schurath, Ulrich
        Attention
        2299/10394
        Abstract
        The imaging unit of the novel cloud particle instrument Particle Habit Imaging and Polar Scattering (PHIPS) probe has been developed to image individual ice particles produced inside a large cloud chamber. The PHIPS produces images of single airborne ice crystals, illuminated with white light of an ultrafast flash-lamp, which are captured at a maximum frequency of similar to 5 Hz by a charge-coupled device (CCD) camera with microscope optics. The imaging properties of the instrument were characterized by means of crystalline sodium hexafluorosilicate ice analogs, which are stable at room temperature. The optical resolving power of the system is similar to 2 mu m. By using dedicated algorithms for image processing and analysis, the ice crystal images can be analyzed automatically in terms of size and selected shape parameters. PHIPS has been operated at the cloud simulation chamber facility Aerosol Interaction and Dynamics in the Atmosphere (AIDA) of the Karlsruhe Institute of Technology at different temperatures between -17 degrees and -4 degrees C in order to study the influence of the ambient conditions, that is, temperature and ice saturation ratio, on ice crystal habits. The area-equivalent size distributions deduced from the PHIPS images are compared with the retrieval results from Fourier transform infrared (FTIR) extinction spectroscopy in case of small (<20 mu m) and with single particle data from the cloud particle imager in case of larger (>20 mu m) ice particles. Good agreement is found for both particle size regimes
        Publication date
        2011-04
        Published in
        Journal of Atmospheric and Oceanic Technology
        Published version
        https://doi.org/10.1175/2011JTECHA1445.1
        Other links
        http://hdl.handle.net/2299/10394
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