This is a new product launch event in London, where Virgin boss Richard Branson is on stage, but can you tell that Richard Branson is an avatar? In fact, Branson is thousands of miles away on vacation in the Caribbean, soaking up the sun.
How did Branson do it? The staff first shot the image of Branson himself, after processing, with special projection equipment to restore the shot image. The audience will see a living and breathing Branson appeared in front of everyone. Researchers said they developed this hologram equipment not only to record images, but also with the use of live equipment, so that people thousands of miles away from each other can communicate face to face. Perhaps one day in the future this technology will evolve into a function of the TV set, into our families, so that watching TV also have an immersive feeling.
A new type of photographic technology that records all the information in the light waves reflected by the subject.
In 1948, the British-Hungarian scientist Gabor proposed and confirmed the principle of holography. 1960 found that the laser, providing a good coherent light source so that the holography has been rapid development and wide application. 1971, Gabor for this was awarded the Nobel Prize in Physics.
Holography and conventional photography is different, recorded on the negative is not a three-dimensional object plane image, but the light field itself. Conventional photography only recorded to reflect the changes in light intensity on the surface of the object being reported, that is, only the amplitude of the light recorded, holographic photography is to record all the information of the light wave, in addition to the amplitude of the light waves also forgot to record the phase of them. That is, all the information of the three-dimensional object light wave field are stored in the recording medium.
Holography is a lensless two-step imaging. The principle is: the use of object light and reference light interference in the light-sensitive film to record an interference pattern, intricate, different transparency patterns, called holography (holographic photographs), equivalent to the film made of an irregular grating, and then the use of holograms on the appropriate illumination of light diffraction, the original three-dimensional image is extracted. The latter process is called reproduction. Hologram is a natural information memory, can be "frozen" the scene again "resurrection" in front of people. Because of this unique performance holograms have a very wide range of applications. Such as for the study of rocket flight shock waves, aircraft wing cellular structure of the non-destructive test. Now not only laser holography, and research success in white light holography, rainbow holography, as well as panoramic rainbow holography, so that people can see all sides of the scene. Holographic three-dimensional three-dimensional display is developing in the direction of holographic color stereoscopic television and film.
In addition to the use of light waves to produce holograms, has been developed to the use of computer-generated holograms. Holograms have a wide range of uses, can be made into a variety of thin-film optical components, such as various lenses, gratings, filters, etc., can be overlapped in space, very compact, lightweight, suitable for use in space flight. The use of holograms to store information, with a large capacity, easy to extract, anti-dirt and other advantages.
The method of holography is promoted from the optical field to other fields. Such as microwave holography, acoustic holography, etc. has been greatly developed, successfully applied in industrial medicine and other aspects. Seismic waves, electronic waves, X-rays and other aspects of holography are also being studied in depth.