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Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope
Ray,
The camera would have to also rotate, otherwise the image would be
inverted as the mirror saw it at 180 degrees. I thought of that earlier
even what kind of cylinder would have to be used to house the rotating
mirror/camera. Acrylic that is cast or extruded does not have the optical
clarity you need to look perpendicular to its axis. It's a mess
optically! The best thing is to probably use the mirror and camera inside
a housing that rotates also. That way you can have a flat plate window for
the camera to look through. The only problem here is right becomes left
viewed thorough the mirror. This can be fixed by changing the polarity of
the horizontal yoke coils in the monitor if it's not solid state
(LCD). This way the beam scans right to left.
Another option would be to create a camera housing shape much like an
AWAC (Sp?) dome that could be rotated. No mater what direction the camera
was pointed in the system would be streamlined. It would use no
mirror. Linkage could be through the hull for drive. I wish I had dome
this but I didn't. I got 20/20 hindsight but not with my periscope. :-)
The reason I wanted the thing in the first place was to be able to see
where I was without blowing ballast. I would dive and loose my orientation
to topside landmarks in lakes. I would then have to blow air into my tanks
to get the windows above the waterline. Now, I can see above the surface
without surfacing. Plus it helps when playing sub commander.
GB
At 12:19 PM 8/8/00 , you wrote:
>Hi,
>
>Is the idea to have the camera fixed looking forward or to be
>able to rotate it? I have been thinking of having a camera looking up
>the cylindrical casing then reflecting off a mirror through a window in
>the side of the cylinder. See ascii drawing.
>
>
> Casing
> -------
> | |
> | |-|
> | / | | M = Mirror
> | / | | C = Camera
> | */ | |View Port * = Mirror pivit axis
> | / | | ZL = Zoom Lens
> |M/ | | RM = Rotate Motor
> | ZL |-|
> | -- |
> | |--| |
> | | | |
> | |C | |
> | | | |
> | -- |
> | _ |
> | | | |
> | |_|RM |
> |-------|
> |-------| Rotate Joint
> | |
> | |
> | | MAST
> | |
> | |
> | |
>
>The mirror could be pivited up and down on a horzontal axis
>"*". On the camera would be a zoom lens. The whole pod
>can rotate 360 degrees on the end of a stream lined
>MAST. The rotation would from a motor in the casing.
>Electrical power and video signal would be through
>wires inside the mast between the casing and hull.
>
>The trick will keeping it all water tight. Adding the
>complication of an extendable mast makes it all worse.
>Perhaps a mast that pivots like some of the early WWII
>snorkels like:
>
>
>
>
>
> _
> | | Camera casing
> |_|
> |
> | Mast
> |
> | Sub deck
> -----*--------
> Pivot Point
>
>
>
>Regards,
>Ray
>
> > From: "D. Blake" <dblake@bright.net>
> > To: <personal_submersibles@psubs.org>
> > Subject: Re: [PSUBS-MAILIST] An Idea for a PSUB Periscope
> > Date: Tue, 8 Aug 2000 00:15:25 -0500
> > Content-Transfer-Encoding: 7bit
> > X-Priority: 3
> > X-MSMail-Priority: Normal
> > X-MimeOLE: Produced By Microsoft MimeOLE V4.72.3612.1700
> >
> > My thoughts also exactly. In addition, I would also remind of the fact
> that
> > what we are talking about is a "lipstick" size camara. The less diameter,
> > the less affect pressure has on it. The fin design heatsink you refer to
> > would not necessarily increase the O.D. to such an extent as to be
> > unmanageable, or overly a hindrance to streamlining concerns. It could
> > probably be fashioned into a 1-1/2" to 2" bullet shaped pod mounted atop a
> > semi-verticle forward leaning aerodynamically shaped arm just ahead and