Tuesday, February 10, 2015

Build Your Own Invisiability Device for Under $150

Researchers at the University of Rochester create a 3-D, transmitting, continuously multidirectional cloaking device. ... and they say you can too!
To build your own Rochester Cloak, follow these simple steps:
lens diagram
For their demonstration cloak, the researchers used 50mm achromatic doublets with focal lengths f1 = 200mm and f2 = 75mm
  1. Purchase 2 sets of 2 lenses with different focal lengths f1 and f2 (4 lenses total, 2 with f1 focal length, and 2 with f2 focal length)
  2. Separate the first 2 lenses by the sum of their focal lengths (So f1 lens is the first lens, f2 is the 2nd lens, and they are separated by t1= f1+ f2).
  3. Do the same in Step 2 for the other two lenses.
  4. Separate the two sets by t2=2 f2 (f1+ f2) / (f1 f2) apart, so that the two f2 lenses are t2 apart.
  • Achromatic lenses provide best image quality.
  • Fresnel lenses can be used to reduce the total length (2t1+t2)
  • Smaller total length should reduce edge effects and increase the range of angles.
  • For an easier, but less ideal, cloak, you can try the 3 lens cloak in the paper.
A patent has been filed for this cloaking device. Please contact UR Ventures for additional information.