Open AccessHigh-speed (20 kHz) digital in-line holography for transient particle tracking and sizing in multiphase flows
Author(s) -
Daniel Robert Guildenbecher,
Marcia A. Cooper,
Paul E. Sojka
Publication year - 2016
Publication title -
applied optics
Language(s) - English
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.55.002892
Subject(s) - optics , propellant , digital holography , sizing , materials science , drop (telecommunication) , displacement (psychology) , particle (ecology) , transient (computer programming) , tracking (education) , particle tracking velocimetry , combustion , mechanics , holography , particle image velocimetry , acoustics , physics , computer science , aerospace engineering , art , pedagogy , psychotherapist , oceanography , chemistry , engineering , visual arts , operating system , psychology , telecommunications , organic chemistry , turbulence , geology
High-speed (20 kHz) digital in-line holography (DIH) is applied for 3D quantification of the size and velocity of fragments formed from the impact of a single water drop onto a thin film of water and burning aluminum particles from the combustion of a solid rocket propellant. To address the depth-of-focus problem in DIH, a regression-based multiframe tracking algorithm is employed, and out-of-plane experimental displacement accuracy is shown to be improved by an order-of-magnitude. Comparison of the results with previous DIH measurements using low-speed recording shows improved positional accuracy with the added advantage of detailed resolution of transient dynamics from single experimental realizations. The method is shown to be particularly advantageous for quantification of particle mass flow rates. For the investigated particle fields, the mass flows rates, which have been automatically measured from single experimental realizations, are found to be within 8% of the expected values.