Dual hologram shearing interference technique for wind tunnel flow fields testing View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-08

AUTHORS

G. Toker, D. Levin, J. Stricker

ABSTRACT

A novel optical diagnostic technique, dual hologram shearing interferometry, for measuring density gradients of different phase objects is proposed and demonstrated. The lateral shearing is achieved by using a phase grating. A holographic interferometer has been developed and designed on the base of a single pass Z type conventional schlieren device. The interferometer’s scheme is insensitive to acoustical disturbances, similarly to the conventional schlieren layout, and is capable of recording holograms with a continuous wave laser during the wind tunnel run.The features of the technique make it tolerant to both the temporal coherence of the laser light source and to the relatively low, schlieren quality optical windows of the wind tunnel’s test section. The obtained reconstructed lateral shearing interferograms with a large region of overlap have high contrast and may have an arbitrary orientation and/or spacing of the background interference fringes.It is believed that the proposed approach will become a useful tool for visualization and accurate mapping of the density gradients of gas dynamic flow fields, in wind and shock tunnels, where acoustic noise problems may dramatically affect reference beam holographic schemes. More... »

PAGES

341-346

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s003480050120

DOI

http://dx.doi.org/10.1007/s003480050120

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003317311


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