Re: death rays underwater - a new scuba hazard?

Thus spake "sweir toronto canada" <sweir5492@xxxxxxxxxx> :

>Spotted this article by Barry Fox on NewScientist.Com:
>Spy-diver killer
>
>If you are scuba diving, be sure not to swim anywhere near any ship or
>installation that has been protected by the Raytheon Corporation's new
>"swimmer denial" system. Otherwise you will very quickly feel extremely
>sick and probably drown.

I thought booby traps were illegal. Sounds like a good liability
case.

>
>Raytheon's underwater sensors detect any unwelcome presence and
>trigger an underwater sound system that emits extremely powerful pulses
>of low frequency audio. The pulse rate and audio frequency are chosen
>to make human organs resonate like organ pipes, causing swimmers to
>vomit into their masks or suffer internal ruptures.
>
>The idea of blasting very powerful sound at underwater targets is not
>new. It can even be used to detonate incoming torpedoes. But it can
>also cause havoc with marine life.
>
>Raytheon's new system is "greener" because the main sound projector, in
>the middle of the secure zone, emits sounds with power and frequency
>that are relatively safe. A dozen or so secondary projectors in a ring
>round the zone also emit safe pulses. But in the region near each
>secondary projector the main and secondaries combine to produce a sound
>which is decidedly dangerous.
>
>Would-be spies or terrorists cannot get through the ring but there is
>no widespread danger to fish, dolphins or whales.

Anything that affects one mammal will affect them all..

--
dillon

666 permissions of the beast
.

Relevant Pages

  • death rays underwater - a new scuba hazard?
    ... trigger an underwater sound system that emits extremely powerful pulses ... The idea of blasting very powerful sound at underwater targets is not ... A dozen or so secondary projectors in a ring ... round the zone also emit safe pulses. ...
    (rec.scuba)
  • Re: Votrax chip SC01/SC02
    ... toggle to recreate the zero crossings of the sampled waveform (usually ... Scott Alfter's SoftDAC and my DAC522 both reproduce sampled sound ... His latest SoftDAC uses pulses at 11KHz with 16 possible ... it means that just a little high frequency "cut" with the treble ...
    (comp.sys.apple2)
  • Re: death rays underwater - a new scuba hazard?
    ... Next time I'm diving at a Navy installation, ... > trigger an underwater sound system that emits extremely powerful pulses ... A dozen or so secondary projectors in a ring ...
    (rec.scuba)
  • Re: Uniden BC-60 xlt repair
    ... crackling ... > emits from the spkr. ...
    (rec.radio.scanner)
  • FC5 sound -- some apps work, some dont
    ... except amarok and audacity, which are run from their GUIs. ... The arts sound daemon is suspended. ... Produces no sound and emits the message ...
    (Fedora)
Loading