DIR Return Create A Forum - Home
---------------------------------------------------------
Cache Walker
HTML https://cachewalker.createaforum.com
---------------------------------------------------------
*****************************************************
DIR Return to: Off Topic
*****************************************************
#Post#: 8330--------------------------------------------------
New invisibility cloak device can hide almost anything
By: SangueG Date: September 29, 2014, 10:37 am
---------------------------------------------------------
New invisibility cloak device can hide almost anything
HTML 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
#Post#: 8332--------------------------------------------------
Re: New invisibility cloak device can hide almost anything
By: Griff Grof Date: September 29, 2014, 2:48 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! :)
#Post#: 8336--------------------------------------------------
Re: New invisibility cloak device can hide almost anything
By: walktall Date: September 29, 2014, 3:58 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:
HTML 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
[list type=decimal]
[li] 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)[/li]
[li] 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).[/li]
[li] Do the same in Step 2 for the other two lenses.[/li]
[li] Separate the two sets by t2=2 f2 (f1+ f2) / (f1— f2) apart,
so that the two f2 lenses are t2 apart.[/li]
[/list]
NOTES:
[list]
[li] Achromatic lenses provide best image quality.[/li]
[li] Fresnel lenses can be used to reduce the total length
(2t1+t2)[/li]
[li] Smaller total length should reduce edge effects and
increase the range of angles.[/li]
[li] For an easier, but less ideal, cloak, you can try the 3
lens cloak in the paper.[/li]
[/list]
A patent has been filed for this cloaking device.[/quote]
HTML https://www.youtube.com/watch?v=oJb9RnAVDuE
How it was done:
HTML https://www.youtube.com/watch?annotation_id=annotation_775088&feature=iv&src_vid=oJb9RnAVDuE&v=GAmWs6zfTj8
*****************************************************