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Star Wars-like Holograms
jeffy124 writes: "Business 2.0 has an article up about Ford's use of holograms during vehicle development. It's almost exactly like that scene in the original Star Wars where R2D2 ran a movie of Princess Leia saying 'Help me Obi Wan.' Basically, Ford uses the system during development to get a look at the car and various parts without needing to construct a full prototype. The image is a 3-D projection and hovers just above the floor, allowing the user to walk around the 'vehicle,' getting a look at it from all angles. I can picture the pr0n jokes now!"
Several years ago I went to a store in Hong Kong that sold high-end holograms. I'm pretty sure I saw a tube-shaped film that you could walk completely around. These type of holograms can theoretically be made on any shape of film (flat, curved, tubular, etc.) The only problem is exposing the entire surface of the object to the two portions of the split laser beam.
For what it's worth, I messed around with holograms in high school. My physics teacher (Tommy Toor, Lyman High School) let me take home the lab's hologram kit, including the laser! How cool is that! (This was 1984...they didn't have laser pointers back then, at least not cheap ones; this laser was about the size of an extra large box of tin foil.) Anyway, you could make two types of holograms: reflection and transmission.
The reflection holograms were the low-quality types you see on credit cards and cd cases. They were pretty flat, but you could view them in ordinary light.
The transmission holograms were much more dramatic. You had to view them through a piece of transparent film illuminated by laser from behind. The object would appear to be beyond the film, rather than on the surface. These are the types that you see in museums and some high-end stores (don't know if they've come up with a way to view them without the laser?) Most of us have seen how you can move from side to side and get a different view as if the object was really there, even to the extent of "unmasking" hidden contours as you move. But a little known fact is that you can cut up the film and each piece still contains the image. Think of covering up different parts of a window: you can still see an object placed outside, but you have to position yourself in a different place to see it. Same with a transmission hologram. If you cut the film in quarters and give them to your friends, they could each see the object. One would have to look down and to the left, one looks down and to the right, etc. Very cool.
Anyway, the technology described in the article sounds like high-quality, quickly produced transmission holograms. Star Wars-style holograms will require some sort of 3-D medium as discussed above.
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