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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 18 — Sep. 15, 2009
  • pp: 2748–2750

Fast-framing ballistic imaging of velocity in an aerated spray

David Sedarsky, James Gord, Campbell Carter, Terrence Meyer, and Mark Linne  »View Author Affiliations


Optics Letters, Vol. 34, Issue 18, pp. 2748-2750 (2009)
http://dx.doi.org/10.1364/OL.34.002748


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Abstract

We describe further development of ballistic imaging adapted for the liquid core of an atomizing spray. To fully understand spray breakup dynamics, one must measure the velocity and acceleration vectors that describe the forces active in primary breakup. This information is inaccessible to most optical diagnostics, as the signal is occluded by strong scattering in the medium. Ballistic imaging mitigates this scattering noise, resolving clean shadowgram-type images of structures within the dense spray region. We demonstrate that velocity data can be extracted from ballistic images of a spray relevant to fuel-injection applications, by implementing a simple, targeted correlation method for determining velocity from pairs of spray images. This work presents the first ballistic images of a liquid-fuel injector for scramjet combustion, and the first velocity information from ballistic images relevant to breakup in the near-field of a spray.

© 2009 Optical Society of America

OCIS Codes
(110.2960) Imaging systems : Image analysis
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(280.2490) Remote sensing and sensors : Flow diagnostics

ToC Category:
Imaging Systems

History
Original Manuscript: April 14, 2009
Revised Manuscript: July 24, 2009
Manuscript Accepted: August 5, 2009
Published: September 9, 2009

Citation
David Sedarsky, James Gord, Campbell Carter, Terrence Meyer, and Mark Linne, "Fast-framing ballistic imaging of velocity in an aerated spray," Opt. Lett. 34, 2748-2750 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-18-2748


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