Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope

[Steve Shawl <steve@yel-o-sub.com>]

That is what I was thinking to except I was thinking of just attaching
standard heat sinks to the outside of the camera housing. Then on
the inside (opposite of the external heat sink) mount another heat sink
this one however could have a small fan (cpu cooler fan would work
good) to increase air circulation. 

As far as the camera being out of the water I would think it wouldn't 
take to much to make the camera removable. Not only would this
keep the camera from over heating in the sun it would also protect 
the housing lens and would protect the whole unit while in transport.

What type of camera are you planning on using that creates so much
heat?

Steve

P.S. Do many people have a cad program? I think it would make
it easier to share some of the ideas. If you don't have a cad program
you can get one FREE at http://www.cadopia.com/ Yes this works
with all Autocad files.


On Mon, 7 Aug 2000 22:30:28 -0400, personal_submersibles@psubs.org wrote:
>Would this idea make sense ?
>Mount the camera chip inside a tube made of a heat conductive material, like
>aluminum. To increase the dissipation of heat by increasing the absorption
>area, fins, made by drilling holes and then boring out the tube to create
>the fins, could be made. Hacksaw slots might be better. Further holes could
>be drilled to (like a revolver six shot chamber) that the external water (or
>air) could flow through to increase the dissipation of heat. Once again,
>hacksaw slots would be better. The outside could be painted white as
>peviously mentioned, to reflect the sun's heat.
>Karl.
>
>----- Original Message -----
>From: Greg Teiber <wolfe19@megsinet.net>
>To: <personal_submersibles@psubs.org>
>Sent: Monday, August 07, 2000 11:01 PM
>Subject: Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope
>
>
>> i was thinking of having the pump in the camera housing.  so all it has to
>do is pull water up a max of a 6' head.  and that water would be compensated
>by the water traveling down the other side.  so the actuall head pressure
>would be in the inches not feet.
>>
>> And you completely missed what I ment about the cooling tube. First thing
>is that doubble pane lenses would be needed because the inside of the tube
>would be most likely lower than than the surrounding air.  1/8" copper
>tubing (which would be perfect for this application)  will withstand more
>than 200psi, so water bursting th cooling pipes isn't a problem.  "thermal"
>windows are not for their insulation value, but for their anti fog value.
>>
>> the cooling tubes would keep the camera chamber at a steady (cold) temp.
>Though as before that would make the window on the camera pod want to fog,
>Therefore he thermal window pane.
>>
>> I'm open to any other criticisms of my idea :)
>>
>>
>> *********** REPLY SEPARATOR  ***********
>>
>> On 8/7/00 at 9:21 PM Gary R. Boucher wrote:
>>
>> >It's not that easy.  Lets say you get a pump.  It has to be a low
>> >voltage pump unless you plan to use a converter.  Pumps designed to work
>on
>> >the surface will not necessarily work 20 feet below the surface.  You may
>> >have to pressure compensate the pump.  You could put the pump inside the
>> >hull but then you have to have some way to get the water through the hull
>> >interface.  Of course the pump will have to be able to handle the
>pressure
>> >at depth.
>> >     The double pane idea seems reasonable at first but the problem you
>> >have is two-fold.  Not only are you trying to make the outside
>temperature
>> >of the tube as low as possible you WANT the heat generated inside the
>> >camera to pass through the tube and on our, otherwise the temperature
>> >inside will increase till there is damage.  You want conduction through
>the
>> >tube, as much as possible.  You just want the tube to be a good radiator
>of
>> >the heat absorbed and generated.  What would help would to be to place a
>> >shield on top of the tube where air can circulate under the shield.  This
>> >would place the tube in the shade in essence lowering the temperature
>that
>> >would exist if exposed to sunlight.
>> >     BTW whatever method you use has to be able to stand the pressure.
>> >     I took some photos with my digital camera of what I have, but am
>> >having some trouble uploading them into the computer.  I will get them
>> >uploaded one way or the other.  When I do, I will send photos of my
>design
>> >out to anyone interested if they will send me an email.
>> >
>> >
>>
>>