Holographic Applications in Shadowgraph, Schlieren, and Interferometry Analyses of Heat Transfer and Fluid Flow Test Subjects,
Abstract
A folded conventional schlieren system was modified for transmission holography. Holograms of different test subjects, two heat transfer and two low supersonic flow studies, were made with direct undiffused laser light. Each event was reconstructed as a real image of the test and was analyzed using ordinary shadowgraph, schlieren, and interferometric techniques. Shadowgraph and schlieren photographs were obtained in two ways: first, a single hologram was double exposed and the interference was reconstructed directly from the hologram; second, two holograms were separately exposed and simultaneously realigned, and the interference was created between the holograms. Local values of density determined from the holographic interferograms agreed with previously known or theoretically calculated values. The shadowgraph and schlieren photographs agreed well with similar pictures of the same test subjects made with incoherent white light. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1970
- Accession Number
- AD0717702
Entities
People
- A. G. Havener
Organizations
- Air Force Research Laboratory