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George you got me thinking about sub windows today and
specifically how light is bent while traveling through them. It seems to me that
when I look in to a fish tank with flat glass windows or through the surface of
a calm pond that the light is bent as it travels through to the denser medium.
I'm sure there is some simple formula or explanation for this effect but I'd
like to know how the effect works while traveling through a domed window or
through a tube. I've seen plenty of spherical submarine windows but I have never
been inside a submarine to know what it might look like looking outside in to
the water from the interior of a spherical or domed window. I've seen the
distortion caused when trying to look inside a submarine from the outside and
I'm wondering if the effect is reversible or if while looking out the window,
the effect is diminished. Is the image looking out similar to wearing a face
mask while snorkeling, that is, is it enlarged? I remember snorkeling once and
finding a $20 floating in the water and thinking it looked fake due to it's
large size but when I returned to the surface and looked at it without the mask
on I discovered to my great joy that it was real. How does a flat pane of glass
enlarge an image? Perhaps someone in the group can direct me to a website
detailing this phenomenon.\
Perhaps I am missing something.
Thanks
Todd
George, this may also help you develop a lens for your
camera that won't distort images. If you can develop a lens that would bring
images back in to proper perspective you could have it cut on a cnc lathe and
then polish it yourself. Perhaps you aren't concerned with
this. From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of George Slaterpryce Sent: Tuesday, February 28, 2006 9:38 AM To: personal_submersibles@psubs.org Subject: [PSUBS-MAILIST] Portholes, Windows I've been trying to make windows for my ROV's
camera to look out of, I'm using acrylic and am pouring that into a mold for the
window shape. The window is 2cm in diameter and 2mm thick. I need to keep it
thin or it distorts the camera image. It's also flat, no dome shape (I couldn't
figure out how to get a nice smooth dome... although now I have quite the
collection of odd shaped tiddly winks if anyone's interested)
Problem is the things are so brittle I don't think
they'll stand up to much preasure.
Am I missing something
here?
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