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Holograms:What are they used for today?
Transcript of Holograms:What are they used for today?
Credit Cards and Driver Licenses
Holograms are used a lot more than the average person might think.
It is still used to create images of people objects, animals, etc.
It is also used in credit cards and drivers licenses.
They put them in these to prevent forgery of these items.
They are also used in medical records, for procedures such as a CAT scan, to provide a detailed layout of a patient.
Holograms are also used to help test different materials used in construction. This lets them see how well something will hold so much weight, without actually having to build the object out of the real material.
What is Holography?
Holography is a technique which enables three-dimensional images (holograms) to be made. It involves the use of a laser, interference, diffraction, light intensity recording and suitable illumination of the recording. The image changes as the position and orientation of the viewing system changes in exactly the same way as if the object were still present, thus making the image appear three-dimensional.
Process of Holography...
When the two laser beams reach the recording medium, their light waves intersect and interfere with each other. It is this interference pattern that is imprinted on the recording medium. The pattern itself is seemingly random, as it represents the way in which the scene's light interfered with the original light source — but not the original light source itself. The interference pattern can be considered an encoded version of the scene, requiring a particular key — the original light source — in order to view its contents.
Bar codes on items such as food and home appliances are also holograms, used to make sure nothing gets stolen.
Holography is a photographic technique that records the light scattered from an object, and then presents it in a way that appears three-dimensional. Holograms pop up in movies such as "Star Wars" and "Iron Man," but the technology has not quite caught up to movie magic — yet.