Cloud particle size distributions measured with an airborne digital in-line holographic instrument
نویسندگان
چکیده
منابع مشابه
Airborne digital holographic system for cloud particle measurements.
An in-line holographic system for in situ 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(-1). The instrument is fully digital and is interfaced to a control and data-a...
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An optical particle counter (OPC) is used in conjunction with lidar measurements to examine the characteristics of the particle size distribution in cirrus cloud in the tropical tropopause layer (TTL) over Thailand where the TTL is defined as the height at which temperature is lower than −75◦C in this paper. Of 11 OPC launches, cirrus cloud was detected at 10–15 km high on 7 occasions, cirrus w...
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An optical system based on in-line digital holography for the evaluation of deformations is described. In-line holograms are recorded on a CCD chip. The problem of overlapping twin images typical for the in-line arrangement is solved by digital reconstruction and filtering of the unwanted wave fronts. Two separate interferograms of an object under test in its undeformed and deformed states are ...
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We first briefly review the state of the art of digital in-line holographic microscopy (DIHM) with numerical reconstruction and then discuss some technical issues, such as lateral and depth resolution, depth of field, twin image, four-dimensional tracking, and reconstruction algorithm. We then present a host of examples from microfluidics and biology of tracking the motion of spheres, algae, an...
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Three-dimensional imaging with micron resolution and simultaneous tracking of many (hundreds) objects (bubbles, beads, algae, bacteria etc.) is now possiblein situ not only with a benchtop microscope, but also remotely in such environments as the deep ocean with a submersible version of the instrument. The instrument is very simple in its hardware requirements and an efficient software package ...
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ژورنال
عنوان ژورنال: Atmospheric Measurement Techniques
سال: 2009
ISSN: 1867-8548
DOI: 10.5194/amt-2-259-2009