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Hand-Drawn Holograms

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Seen on YouTube:

See http://amasci.com/holo/ Scratch-holograms can be made upon plastic CD/DVD cases using a couple of thumbtacks poked through a stick. Or get fancy and use a professional compass and black-painted polycarbonate. Or automate the process with a paperclip stuck into a motorized electric eraser, or a CNC mill with a drag-engraving tool.

For lots of hints, see http://amasci.com/amateur/holohint.html Best is to use a good $10 compass, soft plastic that's slightly greasy, and replace the extremely sharp compass needle with a small finishing nail. Clear plastic works fine, or place some dark paper behind it.

Are these genuine holograms? Abrasion holography or "Chatoyant holograms" employ the same physics as white-light or "rainbow" holograms invented by Benton at MIT. Benton holograms reflect light from a point source, and they do not require any interference pattern. This is why a Rainbow Hologram functions the same under any wavelength of illumination. The fringes of Benton holograms can have any spacing: much wider than wavelengths of light. Said another way: if the holograms on your credit cards are genuine holograms, then also "Scratch-holograms" must be genuine holograms. See http://amasci.com/amateur/holo3.html

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Lots more stuff at SCIENCE HOBBYIST http://amasci.com/unew.html

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Robotics, Microcontrollers and Makers

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