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noise cannon...
Only a few hundreds protesters took to the streets of Pittsburgh to mark the opening day of the G20 summit of world leaders, but the police were taking no chances.
Sonic weapons or long-range acoustic devices have been used by the US military overseas, notably against Somali pirates and Iraqi insurgents.
But US security forces turned the piercing sound on their own citizens yesterday to widespread outrage. Pittsburgh officials told the New York Times that it was the first time "sound cannon" had been used publicly.
[Warning: the video contains very loud audio from the start]
- By Gus Leonisky at 28 Sep 2009 - 12:28pm
- Gus Leonisky's blog
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cannon fodder blaster
It is feared the sounds emitted are loud enough to damage eardrums and even cause fatal aneurysms.
no corm-popping crowd-dispersing heat machine...
The technology has attracted safety concerns possibly because the beam is often confused with the microwaves commonly used by consumers to rapidly heat food.
“There are a lot of misperceptions out there,” lamented Taffola, saying the Pentagon was keen to make clear what the weapon is, and what it is not.
The frequency of the blast makes all the difference for actual injury as opposed to extreme discomfort, stressed Stephanie Miller, who measured the system's radio frequency bioeffects at the Air Force Research Laboratory.
The system ray is 95 gigahertz, a frequency “absorbed very superficially,” said Miller.
"The beam only goes 1/64th of an inch (0.4 millimeter), which “gives a lot more safety.
“We have done over 11,000 exposures on people. In that time we've only had two injuries that required medical attention and in both cases injuries were fully recovered without complications.”
In contrast, microwave frequency is around one gigahertz, which moves faster and penetrates deeper - which is how it can cook meat in an oven, said top researcher Diana Loree.
With the transmitter, a wave 100 times the power of a regular microwave oven cannot pop a bag of popcorn “because the radio frequency is not penetrating enough to heat enough to internally heat the material,” she stressed.
Read more: http://www.smh.com.au/technology/technology-news/us-military-turns-up-the-heat-on-rioting-mobs-20120312-1utbj.html#ixzz1otUIcGfV
welcome to the fart olympics...
Britain's military will be armed with a sonic device that can be used as a high-volume loudspeaker or a non-lethal weapon to disperse crowds at this year's Olympic Games in London, the defence ministry said.
The equipment, which can project a piercing sound over hundreds of metres causing physical pain, has been used during protests at the G20 summit in Pittsburgh in 2009 and against pirates operating off the Somali coast.
The Ministry of Defence said it expected to use it primarily in loudspeaker mode to communicate with boats it wants to stop on the River Thames.
Defence chiefs have already caused controversy by announcing plans to put surface-to-air missiles on the top of residential buildings near the Olympics site in east London.
http://www.abc.net.au/news/2012-05-12/britain-to-deploy-sonic-device-at-games/4007566
see toon at top...