Using Electric Speckle Pattern Interferometry (ESPI) for the measurement of concentration profiles within a binary mixture

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Abstract

This paper describes the development of a Electronic Speckle Pattern Interferometer (ESPI) for measurement of full field two-dimensional concentration gradients as one fluid diffuses into another. The construction and performance of the system is discussed with specific emphasis on developing the interferometer for investigating the mass transfer from a surface into a moving fluid. The system uses a Mach-Zehnder interferometer with a commercially available CCD camera for image acquisition. A phase-shifting algorithm is employed to give full field measurements. Theory pertaining to the optical process involved in these methods is presented with emphasis on optimising the optics by comparison to experimental data. The calculation of the Gladstone-Dale constant for each constituent within a binary mixture is necessary for qualitative measurements and is discussed.

Original languageEnglish
Article numberIMECE2004-59775
Pages (from-to)521-526
Number of pages6
JournalAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Volume260
DOIs
Publication statusPublished - 2004
Event2004 ASME International Mechanical Engineering Congress and Exposition, IMECE 2004 - Anaheim, CA, United States
Duration: 13 Nov 200419 Nov 2004

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