An in-line holographic system for <i>in situ</i> detection of atmospheric cloud particles [Holographic Detector for Clouds (HOLODEC)] has been developed and flown on the National Center for Atmospheric Research C-130 research aircraft. Clear holograms are obtained in daylight conditions at typical aircraft speeds of 100 m s<sup>−1</sup>. The instrument is fully digital and is interfaced to a control and data-acquisition system in the aircraft via optical fiber. It is operable at temperatures of less than −30 °C and at typical cloud humidities. Preliminary data from the experiment show its utility for studies of the three-dimensional spatial distribution of cloud particles and ice crystal shapes.
© 2004 Optical Society of America
(010.1100) Atmospheric and oceanic optics : Aerosol detection
(010.7060) Atmospheric and oceanic optics : Turbulence
(090.0090) Holography : Holography
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
Jacob P. Fugal, Raymond A. Shaw, Ewe Wei Saw, and Aleksandr V. Sergeyev, "Airborne Digital Holographic System for Cloud Particle Measurements," Appl. Opt. 43, 5987-5995 (2004)