Visualization of Unsteady Transonic Flow by Holographic Interferometry Using Photorefractive Media
Abstract
The primary objective of the proposed research was to quantify the applicability of photorefractive media in holographic interferometry as applied to the visualization of unsteady transonic flow. Photorefractive crystals possess properties that make them well suited for holographic interferometry applications. These properties include instantaneous hologram formation (self- development), huge data storage capacity via volume superposition (three dimensional storage), high sensitivity and resolution, erasability and reusability, real-time recording and readout, hologram fixing (archival storage) , and sensitivity to the recording light only. Photorefractive crystals will be important recording media in future holographic interferometry. For aerodynamics, heat transfer, acoustics, and other areas where a large number of interferograms must be rapidly recorded and processed, photorefractive materials have significant advantages over photographic film. This works focus was to carry out a program of research and development to define in detail the applicability of photorefractive crystals to interferometry for the visualization of dynamic flow fields and to establish the techniques necessary for efficient utilization of such media. Concepts developed included volume hologram superposition, real-time interferometry, hologram fixing, coherent image subtraction, and asymmetric recording/readout hologram characteristics (two photon recording). The application of these concepts to the visualization of unsteady transonic flow-fields was emphasized. (KR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 31, 1990
- Accession Number
- ADA228802
Entities
People
- Donald R. Wilson
- Robert Magnusson
Organizations
- University of Texas at Arlington