Documents / Report
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.
UNCLASSIFIED//F8A 8FFHil.l1k WE&i a••k>/ coordinate transformations). This is not a cloaking device: it compresses an extended region of space to a reflecting plate; the interior is hidden behind the plate, but the plate is clearly visible. Such a device conceals the extension and shape of the hidden region but not the fact of hiding itself. A I I I--• 7 - 1- -- - - I- I I 1 I I I 1 1 I I I I T r I I I i -1-1- I I I i j 1 I I I I I I I ~ 1 1 ·- • l T ' I-,-:--1-•-· - _,- i - • _, - L_ I •- L Figure 22. Coordinate Transformation Implemented by a Ground-Plate Cloak B r 1 -r -r ~ -, - 1-1-:--t-:----1 . . ' ----,. - ' -,_ - ' -• - . ' '- I- - • - I r C ] • - j _!- J In order to implement the ground-plate cloak, thousands of cells with split-ring resonators with individual, tailor-made electromagnetic properties were designed, as Figure 23 shows. X •..C •> 1, 0 "•0: •> j •0: Figure 23. Implementation of the Ground-Plate Cloak38 21 1 2, 1G "-1 - I 0 TC a(rnm) UNCLASSIFIED/ ,'F&II. &FFUiil'°'I! l!llili a,112~·
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 29 pages are in the text index: search them above, or from the library's search.