How to make a 'hand-drawn hologram'
Many people have the image that holograms are made using advanced technologies such as lasers and nanotechnology. William Beatty, a researcher at the University of Washington, taught how to make such a hologram using only an acrylic plate and a compass.
Holography without Lasers: Hand-drawn Holograms [SCIENCE HOBBYIST]
You can see what the 'hand-painted hologram' made by Mr. Beatty looks like by watching the following movie.
hand-drawn holograms --YouTube
This is a hand-painted hologram that Beatty made in the early days. If you tilt the acrylic plate to the left or right while shining light on it, the grid drawn by the scratches on the acrylic plate will appear to move in the opposite direction.
And the following is a further improvement of this. If you change the viewing angle after placing it on the ground, the cube will appear to emerge.
Mr. Beatty also has a pyramid with the apex protruding toward you ...
We are showing works in which numbers such as '1', '2', and '3' appear and disappear as if we were looking through a small window. Mr. Beatty said that they made these by hand with a compass without using special equipment.
How to make it is as follows. First, prepare an acrylic resin board and a compass with a sharp-edged object instead of a pencil, and then write the pattern you want to make a hologram on the bottom of the board, here the letter 'V'. Then, place one of the compasses on the V-shape and scratch the acrylic plate by drawing an arc with the other end.
The number of scratches is about 20 and it is OK, but the more scratches there are, the better.
After that, cut out the lower part so that you do not know what kind of hologram it is until you see it. To see the hologram, look at this board in sunlight at different angles. Then, the white dots created by the scratches reflecting light appear to appear in a V shape. This is a hologram.
If the board is transparent and you can't see it well, you can put a black one underneath. Also, if you turn your body so that the light source is directly above the front, or try it under a streetlight at night, it will come out and be easy to see. In addition, Beatty advised that you should use a well-made compass that doesn't wobble or rattle because you can't see the hologram unless you scratch the board with clean lines.
Beatty explains why the scratches made with the compass look like holograms: 'The scratches reflect sunlight like a curved mirror, and the light looks like small white spots of light. And the human brain. Thinks of a pair of two different points of light as 'one point in the back', so when you look at the points of light reflected from many scratches with both eyes, you can see them three-dimensionally. ' did.
Mr. Beatty seems to have noticed this phenomenon with the hint that the bill attached to the hood of the car seems to sink under the hood.
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