Title page for ETD etd-05202010-020034
|Type of Document
||Kurtz, Robert L.
||A holographic system that records front-surface detail of a scene moving at high velocity.
|Loh, H. Y.
|Tipsword, R. F.
|Bowden, Robert L.
|Gilmer, Thomas E. Jr.
|Jacobs, J. A.
|Date of Defense
It is known that any motion of the scene during the exposure of a
hologram results in a spatial modulation of the recorded fringe contrast. On
reconstruction this produces a spatial amplitude modulation of the reconstructed
wavefront that tends to blur out the image. This paper discusses a
novel holographic technique that uses an elliptical orientation for the holographic
arrangement. It is shown that the degree of image degradation is
not only a function of exposure time but also of the system used. The form of
the functional system dependence is given, as well as the results of several
systems tested, which verify this dependence. It is further demonstrated
that the velocity of the target or the exposure time alone is inconsequential by
itself and the important parameter is the total motion of the target ΔX = VT.
Using the resolution of front-surface detail from a target with a velocity of
17,546 cm/sec, we are able to predict an upper limit on target velocity for
resolution of front-surface detail for a given system.
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