DOW-UAP-D122, AAWSAP DIRD, Invisibility Cloaking Theory and Experiments, March 2010
Department of War · 3/2/10 · Las Vegas, Nevada · Document
DOW-UAP-D122, AAWSAP DIRD, Invisibility Cloaking Theory and Experiments, March 2010 is indexed as a Department of War record with incident date 3/2/10 and location Las Vegas, Nevada. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD surveys the theory and early experiments behind invisibility cloaking, describing several ways an object might be hidden from visual or sensor detection, including camouflage, transparency effects, and optical cloaking that bends light around an object. It focuses mainly on metamaterials, negative refraction, and transformation optics, and reviews experiments that had already demonstrated limited cloaking at microwave frequencies. The report argues that imperfect cloaking is physically achievable in some parts of the electromagnetic spectrum, especially for microwaves, but that perfect cloaking is not practical because it would require material properties that conflict with the underlying physics. Its overall conclusion is that cloaking is a scientific field with plausible narrow applications, but that useful visible-light cloaking depends more on future theoretical breakthroughs than on conventional advances in materials science. Redactions have been made to protect the identity of eyewitnesses, the location of government facilities, or potentially sensitive information about military sites not related to UAP. No redactions have been made to any files released under President Trump's directive concerning information about the nature or existence of any encounter reported as a UAP or related phenomena.
Notable / anomalous element
- Perfect cloaking devices are impossible because they require materials where t he speed of light approaches infinity. (native PDF text, page 28)
- Light of different colors would be severely distorted. (native PDF text, page 20)
- Such non-Euclidean cloaking devices are imperfect because they delay the light traveling through the cloak. (native PDF text, page 25)
- to its infinitesimally close neighbor; in physical space the distance between the two infinitesimal neighbors is modified-the speed of light is changed by the refractive index that is given by the ratio between infinitesimal distances in virtual space and the corresponding distances in physical space. (native PDF text, page 23)
Details
- This product is one in a series of advanced technology reports produced in FY 2009 under the Defense Intelligence Agency, Defense Warning Office's Advanced Aerospace Weapon System Applications (AAWSA Pro ram. (native PDF text, page 2)
- Comments or uestions pertaining to this document should be addressed to AAP Person 1 AAWSA Program Manager, Defense Intelligence Agency, ATTN: CLAR/DWO-3, Bldg 6000, Washington, DC 203405100. ii UNCLASSIFIED//FOR OFEICI0L Wlili 8ftt (native PDF text, page 2)
- UNCLASSIFIED/ /FOR OFFICIAL USE O14Lt Contents Introduction. v Camouflage. (native PDF text, page 3)
- Wells's The Invisible Man: Invisibility by Transparency. (native PDF text, page 3)
- An Optical Material Deforms the Coordinates of Space. (native PDF text, page 3)
- UNCLASSIFIED/ /FOR OFFl&I.t.k Uili QPIL Figure 12. (native PDF text, page 4)
- Lycurgus Cup (British Museum; AD Fourth Century). (native PDF text, page 4)
- Idea for a Cloaking Device for Visible Light. (native PDF text, page 4)
Tags: War Department, Nevada, AAWSAP, Technical research, Lights, Weapons