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Posted: 1/30/2011 3:05:16 PM EDT
[#1]
I can see where that would be helpful.
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Posted: 1/30/2011 3:09:07 PM EDT
[#2]
Awesome.
I want a cloaking suit like Predator.  |
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Posted: 1/30/2011 3:17:20 PM EDT
[#3]
......."scientists at the U of I have been studying this phenomenon at the state's capitol, where constituents have been invisible to their legislators for decades".......
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Posted: 1/30/2011 3:23:59 PM EDT
[#4]
So we could cloak some very large and very jagged rocks off our coast. The threat of running aground on these might keep foreign subs away....
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Posted: 1/30/2011 3:27:24 PM EDT
[#5]
"We will pass through the [Chinese] patrols, past their sonar nets, and
lay off their largest city, and listen to their [crappy music]... while we conduct missile drills." |
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Posted: 1/30/2011 3:31:19 PM EDT
[#6]
Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though.
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Posted: 1/30/2011 3:31:37 PM EDT
[#7]
Yeah, so let's tell everyone so they can counter it or come up with it on their own/steal our technology...let's do that!
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Posted: 1/30/2011 3:33:44 PM EDT
[#8]
So, when do we sell it to the Chinese?
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Posted: 1/30/2011 3:38:17 PM EDT
[#9]
Quoted:
So, when do we sell it to the Chinese? They've already made a couple of payments. |
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Posted: 1/30/2011 3:38:58 PM EDT
[#10]
Today we schail into history
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Posted: 1/30/2011 3:39:59 PM EDT
[#11]
Quoted: Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. That makes no sense. Active sonar pings out sound and picks up what bounces back, like radar does with electromagnetic radiation. |
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Posted: 1/30/2011 3:42:53 PM EDT
[#12]
So, this would only work on active sonar right?
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Posted: 1/30/2011 3:42:58 PM EDT
[#13]
I've always wondered, does the government ever step in when universities make discoveries like this to make sure things remain classified, or is it purely up to the schools to decide if they want to take any action to keep stuff like this away from spies etc.?
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Posted: 1/30/2011 3:44:07 PM EDT
[#14]
Quoted:
I've always wondered, does the government ever step in when universities make discoveries like this to make sure things remain classified, or is it purely up to the schools to decide if they want to take any action to keep stuff like this away from spies etc.? Where do you suppose the funding comes from? |
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Posted: 1/30/2011 3:47:14 PM EDT
[#15]
Quoted:
Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. Sound reflects off ANY change in density. The sound is traveling through water at about 4850 FPS. When it hits the steel of the hull some of it is reflected (even though steel is a better sound conductor than water) the rest ACCELERATES through the steel... The best reflections occur when it transitions from a good (sound) conducting medium (the steel hull) and hits the less conductive air inside the ship. Disclosure: I am a qualified submariner and a sonar technician. Quoted:
Quoted:
Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. That makes no sense. Active sonar pings out sound and picks up what bounces back, like radar does with electromagnetic radiation. It isn't intuitive -but it does work that way. |
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Posted: 1/30/2011 3:49:18 PM EDT
[#16]
As I understand it subs don't use active sonar so this wouldn't do any good in regards to sub on sub warfare
It might have application in defeating sub finding sonar buoys though or sonar originating from a ship. |
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Posted: 1/30/2011 3:49:33 PM EDT
[#17]
Quoted: So, this would only work on active sonar right? From the article :The technology could also be applied to other areas of submarine stealth, such as cavitation, whereby small bubbles form and implode around fast moving objects like propeller blades. Fang and his group believe they could harness their cloak’s properties to balance energy in caviation-causing areas. Thus, the cloak could be used to keep noise from getting out of a submarine in addition to stopping sonar waves from bouncing back to their source. |
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Posted: 1/30/2011 3:51:32 PM EDT
[#18]
Quoted:
As I understand it subs don't use active sonar so in most cases there's nothing to detect Not true. Every pump spinning produces vibration, the electrical system hums, hydraulics "woosh", lots and lots of opportunity to detect a contact... Open ocean -passive sonar is the way to go- In shallows (and you might be suprised how much time some boats spent there) active is a handy tool. |
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Posted: 1/30/2011 3:53:18 PM EDT
[#19]
Quoted:
Quoted:
As I understand it subs don't use active sonar so in most cases there's nothing to detect Not true. Open ocean -passive sonar is the way to go- In shallows (and you might be suprised how much time some boats spent there) active is a handy tool. Edited orginal post to be more clear, I guess this wouldn't do anything to hide a sub from another sub but it would hide it from a ship? |
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Posted: 1/30/2011 3:53:41 PM EDT
[#20]
Quoted:
I've always wondered, does the government ever step in when universities make discoveries like this to make sure things remain classified, or is it purely up to the schools to decide if they want to take any action to keep stuff like this away from spies etc.? Most of it is funded through grants and the run the press releases through .gov. My wife works for a small company that produces the wafers in night vision. They do other work too and that's pretty much how it rolls. |
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Posted: 1/30/2011 3:58:29 PM EDT
[#21]
Quoted:
So we could cloak some very large and very jagged rocks off our coast. The threat of running aground on these might keep foreign subs away.... While it seems obvious that submarines would feel their way around the ocean with sonar pinging away in search of obstacles, and targets - the reality is that they pretty much drive around with the windows blacked-out, and their fingers crossed. |
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Posted: 1/30/2011 3:59:10 PM EDT
[#22]
Quoted: Quoted: So, this would only work on active sonar right? From the article :The technology could also be applied to other areas of submarine stealth, such as cavitation, whereby small bubbles form and implode around fast moving objects like propeller blades. Fang and his group believe they could harness their cloak’s properties to balance energy in caviation-causing areas. Thus, the cloak could be used to keep noise from getting out of a submarine in addition to stopping sonar waves from bouncing back to their source. I hardly ever click the link and read the whole article. Way too much effort involved in that. |
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Posted: 1/30/2011 4:00:47 PM EDT
[#23]
Quoted: Quoted: As I understand it subs don't use active sonar so in most cases there's nothing to detect Not true. Every pump spinning produces vibration, the electrical system hums, hydraulics "woosh", lots and lots of opportunity to detect a contact... Open ocean -passive sonar is the way to go- In shallows (and you might be suprised how much time some boats spent there) active is a handy tool. Torpedoes also use active sonar to home in on their targets, correct? |
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Posted: 1/30/2011 4:09:53 PM EDT
[#24]
Quoted:
Quoted:
Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. Sound reflects off ANY change in density. The sound is traveling through water at about 4850 FPS. When it hits the steel of the hull some of it is reflected (even though steel is a better sound conductor than water) the rest ACCELERATES through the steel... The best reflections occur when it transitions from a good (sound) conducting medium (the steel hull) and hits the less conductive air inside the ship. Disclosure: I am a qualified submariner and a sonar technician. Quoted:
Quoted:
Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. That makes no sense. Active sonar pings out sound and picks up what bounces back, like radar does with electromagnetic radiation. It isn't intuitive -but it does work that way. Is the thermocline layer as effective at avoiding detection as they make it out to be in books and movies? Does it affect the active sonar of torpedoes? |
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Posted: 1/30/2011 4:47:53 PM EDT
[#25]
"When will we be selling it to China?"
Probably setting up a factory now. |
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Posted: 1/30/2011 4:50:35 PM EDT
[#26]
How long before it's adapted for underwater mines?
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Posted: 1/30/2011 5:01:23 PM EDT
[#27]
Quoted: Yeah, so let's tell everyone so they can counter it or come up with it on their own/steal our technology...let's do that! Exactly, what happened to loose lips sink ships? |
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Posted: 1/30/2011 5:05:58 PM EDT
[#28]
Quoted: Quoted: Quoted: Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. Sound reflects off ANY change in density. The sound is traveling through water at about 4850 FPS. When it hits the steel of the hull some of it is reflected (even though steel is a better sound conductor than water) the rest ACCELERATES through the steel... The best reflections occur when it transitions from a good (sound) conducting medium (the steel hull) and hits the less conductive air inside the ship. Disclosure: I am a qualified submariner and a sonar technician. Quoted: Quoted: Speaking of Tom Clancy, I read in one of his books that active sonor doesn't detect the metal hull of the sub. It detects the air inside the ship. I don't know if it is true or not though. That makes no sense. Active sonar pings out sound and picks up what bounces back, like radar does with electromagnetic radiation. It isn't intuitive -but it does work that way. Is the thermocline layer as effective at avoiding detection as they make it out to be in books and movies? Does it affect the active sonar of torpedoes? Depends. Sometimes it's strong, sometimes it's completely non-existent. Also depends on where the sub and where the torpedo are in relation to one another––so it can also work to your disadvantage. |
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Posted: 1/30/2011 5:31:07 PM EDT
[#29]
Quoted:
Quoted:
I've always wondered, does the government ever step in when universities make discoveries like this to make sure things remain classified, or is it purely up to the schools to decide if they want to take any action to keep stuff like this away from spies etc.? Where do you suppose the funding comes from? This. The navy doles out tons of grants to Universities. Hell, both Penn State Engineering and ARL gets most of its money from DoD and especially Navy, including the project I'm on. The building the Watertunnel is housed in doesn't allow cell phones or non US citizens inside as its all Navy funded submarine and torpedo research. |
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