Skip to comments.
'Invisibility cloaks' could break sound barriers
Duke University ^
| January 9, 2008
| Unknown
Posted on 01/09/2008 2:03:11 PM PST by decimon
click here to read article
Navigation: use the links below to view more comments.
first 1-20, 21-28 next last
See no evil, hear no evil.
The article doesn't mention sonic booms.
1
posted on
01/09/2008 2:03:12 PM PST
by
decimon
To: decimon
2
posted on
01/09/2008 2:06:43 PM PST
by
hattend
To: decimon
This sounds like something a submariner could use.
3
posted on
01/09/2008 2:07:07 PM PST
by
numberonepal
(Don't Even Think About Treading On Me)
To: decimon
4
posted on
01/09/2008 2:08:38 PM PST
by
peyton randolph
(tag line taking a siesta)
To: peyton randolph
WHAT?
5
posted on
01/09/2008 2:12:26 PM PST
by
KarlInOhio
(Rattenschadenfreude: joy at a Democrat's pain, especially Hillary's pain caused by Obama.)
To: decimon
6
posted on
01/09/2008 2:13:42 PM PST
by
Hegemony Cricket
(Although most dead people vote democrat, aborted babies, if given the choice, would vote Republican.)
To: numberonepal
This sounds like something a submariner could use.Yeah, they mentioned that. Good thing they didn't have this in WWII or we wouldn't have those cool submarine movies. ;-)
7
posted on
01/09/2008 2:15:16 PM PST
by
decimon
To: Thud
8
posted on
01/09/2008 2:16:44 PM PST
by
Dark Wing
To: decimon
Turn it inside out and mount it on a firearm....Hmm.
9
posted on
01/09/2008 2:17:30 PM PST
by
Smokin' Joe
(How often God must weep at humans' folly.)
To: KarlInOhio
From the show
Get Smart - "Another of the show's recurring gags was the Cone of Silence. Smart would pedantically insist on following CONTROL's security protocols; when in the Chief's office he would insist on speaking under the Cone of Silence--two transparent plastic hemispheres which were electrically lowered on top of Smart and the Chief--which invariably malfunctioned, requiring the characters to shout loudly to even have a chance of being understood by each other, and even then, most of the time that failed. In one episode, the device worked so badly that an outside observer, who could hear everything spoken inside, had to relay messages to the people inside because they could not even hear each other. At other times, the Cone of Silence would malfunction while being lowered and fail to stop at the proper desk level; the device would then repeatedly crush down onto Agent 86 and the Chief, resulting in loud anguished screams. The Cone actually worked as intended once. However, at the end of the conversation, the Cone malfunctioned leaving the Chief trapped within, with silent screams of frustration as Agent 86 walked away."
To: decimon
someone put one over Hillary and they’ll be granted sainthood.
11
posted on
01/09/2008 2:18:55 PM PST
by
WOBBLY BOB
(I think I'll buy everyone a carbon credit for Christmas.)
To: nnn0jeh
12
posted on
01/09/2008 2:23:31 PM PST
by
kalee
(The offenses we give, we write in the dust; Those we take, we write in marble. JHuett)
To: Locomotive Breath
13
posted on
01/09/2008 2:25:05 PM PST
by
krb
(If you're not outraged, people probably like having you around.)
To: decimon
The article doesn't mention sonic booms. You're thinking of this technology in the wrong way.
Sonic booms are generated by aircraft moving faster than the speed of sound. If an aircraft is made of this new theoretic material, it would still be moving faster than the speed of sound and would still generate a 'sonic boom'.
However, any item made of this material that is in the path of the sound waves produced, would not disrupt the waves at all.
This is why the most exciting application would be in submarine stealth technology. No disruption of sonar (sound) waves, no way to detect the presence of the sub that is outfitted with this new material. Think of the possibilities.
14
posted on
01/09/2008 2:33:16 PM PST
by
Bloody Sam Roberts
(Great spirits will always encounter violent opposition from mediocre minds.)
To: Bloody Sam Roberts
"Such an acoustic veil would do for sound what the "invisibility cloak" previously demonstrated by the research team does for microwaves--allowing sound waves to travel seamlessly around it and emerge on the other side without distortion (http://www.pratt.duke.edu/news/?id=792)."
< >
"Cummer wasn't convinced. "In my mind, waves are waves," he said. "It was hard for me to imagine that something you could do with electromagnetic waves would be completely undoable for sound waves.""
Oil is oil.
I have no idea if this could apply to sonic booms. Just thought I'd raise the question.
15
posted on
01/09/2008 2:41:43 PM PST
by
decimon
To: decimon
I have no idea if this could apply to sonic booms. Just thought I'd raise the question.
Electromagnetic radiation consists of photos, and travels through a medium. Sound waves are comprised of oscillations in the medium itself.
16
posted on
01/09/2008 2:52:22 PM PST
by
zencat
(The universe is not what it appears, nor is it something else.)
To: peyton randolph
Thus the "WHAT!" I always remember the Chief and Smart having a hard time hearing each other while using the Cone of Silence.
17
posted on
01/09/2008 3:01:23 PM PST
by
KarlInOhio
(Rattenschadenfreude: joy at a Democrat's pain, especially Hillary's pain caused by Obama.)
To: Hyzenthlay
18
posted on
01/09/2008 3:06:45 PM PST
by
metmom
(Welfare was never meant to be a career choice.)
To: zencat
“Electromagnetic radiation consists of photos”
I have seen these photos.
19
posted on
01/09/2008 3:08:25 PM PST
by
UCANSEE2
(Just saying what 'they' won't.)
To: decimon
Metamaterials.
Guess we are going to have to develop a bit more in the field of metaphysics.
20
posted on
01/09/2008 3:09:34 PM PST
by
UCANSEE2
(Just saying what 'they' won't.)
Navigation: use the links below to view more comments.
first 1-20, 21-28 next last
Disclaimer:
Opinions posted on Free Republic are those of the individual
posters and do not necessarily represent the opinion of Free Republic or its
management. All materials posted herein are protected by copyright law and the
exemption for fair use of copyrighted works.
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson