Quantitative Interpretation of Multi-Directional Holographic Interferometry.
Final rept. 1 Feb 74-31 Jul 75,
MICHIGAN UNIV ANN ARBOR INTERFEROMETRY LAB
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This final technical report on quantitative interpretation of multidirectional holographic interferometry contains summaries of a number of specific investigations conducted in the Department of Mechanical Engineering, The University of Michigan. The primary objective of this research is the minimization of data required to obtain complete three-dimensional density information from wind tunnel holographic interferometry tests on arbitrary models. The investigations described herein are 1 The theory of reconstruction of functions from their projections was reviewed and evaluated in the context of application to holographic interferometric data of the type used for wind tunnel diagnostics 2 Using computer-simulated experimental data, several algorithms for data analysis were compared 3 A study of direct three-dimensional reconstruction of density fields, as opposed to reconstruction of the fields on a set of cross-sectional planes, was conducted 4 The use of a priori knowledge of the physical structure of the field being measured was considered 5 The problems associated with refraction of probing optical rays were studied 6 Experimental work of limited scope was carried out. A study of illumination schemes for multi-directional holographic interferometers resulted in the design of a holographic phase grating for generating several plane waves of high optical quality, each propagating in a different direction.
- Test Facilities, Equipment and Methods