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Defense Intelligence Reference Document Invisibilty Cloaking Theory And Experiments
Defense Intelligence Agency · 29 pages · text from the file's own layer
This Defense Intelligence Reference Document, dated 2 March 2010 and produced by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) Program, is a technical survey of invisibility. It covers camouflage, including stealth aircraft and optical camouflage, then transparency, cloaking by coordinate transformation, metamaterials and non-Euclidean broadband cloaking. It concludes that perfect cloaking is impossible but imperfect microwave cloaks are within reach of present technology. Whether cloaking will work at visible wavelengths remains unclear.
“The Times”8 pages
- p. 6 …From
the direction and the time delay of the
reflected waves, the direction and --:..
distance of…
- p. 8 …the atoms or molecules of these
substances absorb and re-emit light,
which takes time. The…
- p. 11 …According
to Fermat's principle, light follows the
path that takes the shortest time. In
refractive…
- p. 12 …In traveling from A to B, light follows
the path that takes the shortest time, traveling…
- p. 21 …For light, the wave fronts are the features of oscillations across space and time;
by themselves…
- p. 24 …The sphere is invisible; it
shows only as a time delay of the light ray. Although…
- p. 25 …With sensitive timing or wave-front sensing one could, in
principle, detect the presence of the…
- p. 27 …The required optical properties should be calculated in real time, and the
material should change accordingly…
2 March 2010
ICOD: 1 December 2009
DIA-08-1003-001
UNCLASSIFIED/ ;/
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 29 pages are in the text index: search them above, or from the library's search.