HR: 16:30h
AN: A12F-03    [PDF]
TI: Airborne Digital In-Line Holographic System for 3-D Imaging of Cloud Particles
AU: Fugal, J P
EM: jpfugal@mtu.edu
AF: Department of Physics, Michigan Tech, 1400 Townsend Drive, Houghton, MI 49931 United States
AU: Saw, E
EM: ewsaw@mtu.edu
AF: Department of Physics, Michigan Tech, 1400 Townsend Drive, Houghton, MI 49931 United States
AU: Sergeyev, A V
EM: avsergue@mtu.edu
AF: Department of Physics, Michigan Tech, 1400 Townsend Drive, Houghton, MI 49931 United States
AU: * Shaw, R A
EM: rashaw@mtu.edu
AF: Department of Physics, Michigan Tech, 1400 Townsend Drive, Houghton, MI 49931 United States
AB: We have developed an airborne holographic instrument for obtaining cloud particle sizes and shapes and their three-dimensional spatial distribution. The primary scientific motivation for the instrument is to provide \emph{in-situ} measurements of cloud particle spatial correlations, conditioned on particle size. Accurate quantification of spatial correlations at cm-scales and below has been elusive, in part because only one-dimensional spacing data have been available. The optical technique used in the instrument is based on `in-line holography,' where the same collimated light source serves as both the reference beam and the object beam. The system is completely digital, including the capture of holograms using a CCD array, transmission of the data via optical fiber, and subsequent reconstruction of the real image. During the recent IDEAS-3 field project hosted by the NCAR Research Aviation Facility the instrument was tested in flight for the first time, where holograms containing populations of cloud droplets, drizzle drops, and ice crystals were obtained.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0320 Cloud physics and chemistry
DE: 0394 Instruments and techniques
DE: 3379 Turbulence
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting