NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
an approach for automated analysis of particle hologramsA simple method for analyzing droplet holograms is proposed that is readily adaptable to automation using modern image digitizers and analyzers for determination of the number, location, and size distributions of spherical or nearly spherical droplets. The method determines these parameters by finding the spatial location of best focus of the droplet images. With this location known, the particle size may be determined by direct measurement of image area in the focal plane. Particle velocity and trajectory may be determined by comparison of image locations at different instants in time. The method is tested by analyzing digitized images from a reconstructed in-line hologram, and the results show that the method is more accurate than a time-consuming plane-by-plane search for sharpest focus.
Document ID
19850027883
Document Type
Reprint (Version printed in journal)
Authors
Stanton, A. C.
(Aerodyne Research, Inc. Billerica, MA, United States)
Caulfield, H. J.
(Aerodyne Research, Inc. Billerica, MA, United States)
Stewart, G. W.
(Aerodyne Research, Inc. Billerica, MA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Optical Engineering
Volume: 23
ISSN: 0091-3286
Subject Category
INSTRUMENTATION AND PHOTOGRAPHY
Funding Number(s)
CONTRACT_GRANT: NAS3-24094
Distribution Limits
Public
Copyright
Other