Periscopic Projecter
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Hi, i dont really know much about this and thought someone here might be able to help, im trying to design a periscope to project onto a wall inside a building (with no artificial projection so using no electricity) it needs to be passive so that it can project the movement of the sky over the course of a day.
heres a brief mock up its litertally taking a periscope and reflecting the image onto a glazed wall that the viewer would be on the other side of, but im not sure how this would work in terms of using a lens to magnify the image onto the wall (hence keeping the distance between the wall and mirror to a minimum) i have attached a very crude image any comments/help would be really useful including how this would work in 3d if i wanted to project across a whole wall- would the periscope then need to span the entire distance?
thanks in advance
(any suggestions are seriously welcome as im a bit lost on this one)
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something similar to Velux Sun Tunnel ?
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I'd think that the best start would be to research some data on a camera obscura, which is also a passive system.
It seems likely that you are going to need a reasonably large light collector coupled with a lens system to get a decently strong image to project onto a wall.
AS far as I can see, the only difference is that you'll need a mirror or prism to bend the light through a right angle to send it to the wall, rather than having it come straight down onto a piece of paper or the usual table top. -
You'll also have to keep in mind that when you project the light onto the entirewall, the light strength will exponentially decrease with the increase of the surface you project on.
Therefore - as Aalan suggested - you will need a reasonably large light collector probably equipped with some kind of lense that would collect even more light. Like I think there are lenses in those light tubes Tavi mentioned, too (I have never seen any closely).
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