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DESCRIPTION:Holography of Wi-Fi radiation\nPhilipp Holl [1\,2] and Friedemann Reinhard 
 [2]\n\n[1] Max Planck Institute for Physics\n[2] Walter Schottky Institut a
 nd Physik-Department\, Technical University of Munich\n\nWhen we think of w
 ireless signals such as Wi-Fi or Bluetooth\, we usually think of bits and b
 ytes\, packets of data and runtimes.  \n\nInterestingly\, there is a second
  way to look at them. From a physicist's perspective\, wireless radiation i
 s just light\, to be precise: coherent electromagnetic radiation. It is vir
 tually the same as the beam of a laser\, except that its wavelength is much
  longer (cm vs µm). \n\nWe have developed a way to visualize this radiatio
 n\, providing a view of the world as it would look like for eyes sensitive 
 to wireless radiation. \n\nOur scheme is based on holography\, a technique 
 to record three-dimensional pictures by a phase-coherent recording of radia
 tion in a two-dimensional plane. This technique is traditionally implemente
 d using laser light. We have adapted it to work with wireless radiation\, a
 nd recorded holograms of building interiors illuminated by the omnipresent 
 stray field of wireless devices. In the resulting three-dimensional images 
 we can see both emitters (appearing as bright spots) and absorbing objects 
 (appearing as shadows in the beam). Our scheme does not require any knowled
 ge of the data transmitted and works with arbitrary signals\, including enc
 rypted communication. \n\nThis result has several implications: it could pr
 ovide a way to track wireless emitters in buildings\, it could provide a ne
 w way for through-wall imaging of building infrastructure like water and po
 wer lines. As these applications are available even with encrypted communic
 ation\, it opens up new questions about privacy."\n\n\n
DTEND;TZID=Europe/Berlin:20171229T123000
DTSTAMP:20171220T105656Z
DTSTART;TZID=Europe/Berlin:20171229T113000
LAST-MODIFIED:20171220T105651Z
LOCATION:Saal Dijkstra
SEQUENCE:0
SUMMARY:Holography of Wi-Fi radiation - Friedemann Reinhard
TRANSP:OPAQUE
UID:95f6e79b-e6a5-4d93-b4ba-cb70470ed819@frab.cccv.de
URL;VALUE=URI:https://fahrplan.events.ccc.de/congress/2017/Fahrplan/events/9024.html
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