(DIR) Return Create A Forum - Home --------------------------------------------------------- Cache Walker (HTM) 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 (HTM) 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: (HTM) 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] (HTM) https://www.youtube.com/watch?v=oJb9RnAVDuE How it was done: (HTM) https://www.youtube.com/watch?annotation_id=annotation_775088&feature=iv&src_vid=oJb9RnAVDuE&v=GAmWs6zfTj8 *****************************************************