Design of an in-line, digital holographic imaging system for airborne measurement of clouds

We discuss the design and performance of an airborne (underwing) in-line digital holographic imaging system developed for characterizing atmospheric cloud water droplets and ice particles in situ. The airborne environment constrained the design space to the simple optical layout that in-line non-beam-splitting holography affords. The desired measurement required the largest possible sample volume in which the smallest desired particle size (~5 μm) could still be resolved, and consequently the magnification requirement was driven by the pixel size of the camera and this particle size. The resulting design was a seven-element, double-telecentric, high-precision optical imaging system used to relay and magnify a hologram onto a CCD surface. The system was designed to preserve performance and high resolution over a wide temperature range. Details of the optical design and construction are given. Experimental results demonstrate that the system is capable of recording holograms that can be reconstructed with resolution of better than 6.5 μm within a 15 cm³ sample volume.

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Copyright 2011 Optical Society of America. This paper was published in Applied Optics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-50-10-1405. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.


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Author Spuler, Scott
Fugal, Jacob
Publisher UCAR/NCAR - Library
Publication Date 2011-04-01T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:26:34.283036
Metadata Record Identifier edu.ucar.opensky::articles:11597
Metadata Language eng; USA
Suggested Citation Spuler, Scott, Fugal, Jacob. (2011). Design of an in-line, digital holographic imaging system for airborne measurement of clouds. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7348kz2. Accessed 15 February 2025.

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