CacheWalker

General => Off Topic => Topic started by: Gackt on September 29, 2014, 04:37:03 pm

Title: New invisibility cloak device can hide almost anything
Post by: Gackt on September 29, 2014, 04:37:03 pm
New invisibility cloak device can hide almost anything (http://www.foxnews.com/tech/2014/09/29/new-invisibility-cloak-device-can-hide-almost-anything/)

*New cache ideas forming* But will wait till the cost comes down a bit  ;D
Title: Re: New invisibility cloak device can hide almost anything
Post by: Griff Grof on September 29, 2014, 08:48:36 pm
Wow, that's incredible!

I can't see how it could be used with a cache though - maybe my creative cap isn't on  :D

Now, imagine one which SHOWS things you can't see - that'd work for a cache too!  ;)

Thanks for sharing!  :)
Title: Re: New invisibility cloak device can hide almost anything
Post by: walktall on September 29, 2014, 09:58:24 pm
The basic four lens version, you need a gap in the central spot for it to work or the item your hiding, doesn't cross the central spot


Quote
To build your own Rochester Cloak, follow these simple steps:
(http://www.rochester.edu/newscenter/wp-content/uploads/2014/09/lens-diagram-630x290.jpg)

For their demonstration cloak, the researchers used 50mm achromatic doublets with focal lengths f1 = 200mm and f2 = 75mm

   
  • 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)
  • 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).
  • Do the same in Step 2 for the other two lenses.
  • Separate the two sets by t2=2 f2 (f1+ f2) / (f1 f2) apart, so that the two f2 lenses are t2 apart.

NOTES:

  • 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.


https://www.youtube.com/watch?v=oJb9RnAVDuE

How it was done:
https://www.youtube.com/watch?annotation_id=annotation_775088&feature=iv&src_vid=oJb9RnAVDuE&v=GAmWs6zfTj8