Re: "electronically" puncture CO2 cartridge... how?

Richard Henry wrote:
> "David L. Jones" <altzone@xxxxxxxxx> wrote in message
> news:1131662339.471313.111690@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > Rob wrote:
> > > >
> > > > On a military sonarbuoy project I worked on we did this by having a
> > > > spring loaded spike that was held in place by a string which was
> rapped
> > > > around a resistor body. Pass current through the resistor and it heats
> > > > up burns the string and releases the spring loaded spike which
> > > > punchures the can.
> > > >
> > > > This mechanism was manufactured in the tens of thousands and proved
> > > > 100% reliable. It even survived the harsh conditions of being slammed
> > > > into the ocesn from a helicopter or plane.
> > > >
> > > > Dave :)
> > > >
> > >
> > > Neat! What was it used for - recovery of the units from the ocean floor?
> > >
> > > rob
> >
> > When the unit hit the ocean a salt water battery would activate the
> > firing mechanism and inflate a bag so that the RF transmitter would
> > float on the surface while the sonar sensors dangled 100m below on a
> > tethered cable. The antenna was inside the bag too, so when the bag
> > inflated the antenna was pulled straight up.
> > After a set number of hours use the software would burn another
> > resistor attached to the side of the bag, this would puncture the bag
> > and cause the buoy to sink to the bottom.
> > Can't have those Russian fishing trawlers picking up the military
> > sonarbuoys now can we?
> > Yep, the ocean is unfortunately littered with tens of thousands of
> > these things :-(
>
> Not all of them sink.

Correct. There are retrievable ones, dipping sonars, towed arrays etc.
But the disposable ones are still very popular in most navies around
the world.

Dave :)

.

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