Digital holographic spray analyzer

B. Miller (Benjamin Miller) , K. A. Sallam, K. C. Lin, C. Carter

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Advanced spray diagnostics are needed for studying the formation of drops in a variety of natural and technological spray processes, e.g. water falls, bow waves of ships, and many types of commercial spray atomizers, among others. Of interest is the dense-spray near-injector region which is typically opaque for spray diagnostics such as phase Doppler particle analyzers (PDPA). This is unfortunate because primary breakup processes that control spray size and velocity distributions occur in this optically challenging region. The present setup; digital holographic spray analyzer, allows the probing of dense spray regions and provides the user with droplet sizes and velocities measurements in three dimensions. The setup is based on typical in-line holography except that the holographic film is replaced with a CCD sensor. The actual process of capturing the hologram is a relatively simple process only requiring a laser, optics to form a collimated beam, and a digital camera. The hologram is then stored digitally and reconstructed numerically with a reconstruction program. After reconstructing the hologram in many different planes, the droplet size distribution is measured. In addition droplet velocities are measured by means of double pulsed exposure configuration and PIV program. All these processes can be automated which is the strength of this technique. The output is a three dimensional map of droplets locations, sizes, and velocities. This digital holographic spray analyzer was tested by measuring droplet sizes inside the dense spray created by an aerated injector subjected to a subsonic crossflow typical of test condition encountered in ramjet engine.

Original languageEnglish
Title of host publicationProceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006
PublisherAmerican Society of Mechanical Engineers
Number of pages6
ISBN (Print)0791847500, 9780791847503
StatePublished - 2006
Externally publishedYes
Event2006 ASME Joint U.S.- European Fluids Engineering Division Summer Meeting, FEDSM2006 - Miami, FL, United States
Duration: 17 Jul 200620 Jul 2006

Publication series

NameProceedings of ASME Fluids Engineering Division Summer Meeting 2006, FEDSM2006
Volume2 FORUMS


Conference2006 ASME Joint U.S.- European Fluids Engineering Division Summer Meeting, FEDSM2006
Country/TerritoryUnited States
CityMiami, FL

ASJC Scopus subject areas

  • Engineering (all)


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