Rainbow hologram

Rainbow hologram

The rainbow hologram or Benton hologram was invented in 1968 by Dr. Stephen A. Benton at Polaroid Corporation (later MIT). Rainbow holograms are designed to be viewed under white light illumination, rather than the more esoteric laser light required previously. The rainbow holography recording process uses a horizontal slit to eliminate vertical parallax in the output image, greatly reducing spectral blur while preserving three-dimensionality for most observers. A viewer moving up or down in front of a rainbow hologram sees changing spectral colors rather than different vertical perspectives. Stereopsis and horizontal motion parallax, two relatively powerful cues to depth, are preserved.

This invention illustrates an underlying theme of Benton's work: to reduce the amount of information in a hologram to more closely match the requirements of the human visual system.

The holograms found on credit cards are examples of rainbow holograms. These very common holograms are technically transmission holograms mounted onto a reflective surface like a metalized polyethylene terephthalate substrate commonly known as PET in the holographic industry. The Rainbow Holographic process can also be applied to very large sheets of holographic film, resulting in what is known as a large format Rainbow Transmission Hologram.

Large Format Rainbow Transmission Holograms

Large Format Rainbow Transmission Holograms are made using the system described above, with a horizontal slit master hologram recorded that captures only the horizontal information of the three dimensional model. These type of holograms can be made with either continuous wave or pulse lasers. If using a continuous wave laser, and exposing very large pieces of film (up to 2 metres x 1.1 metre) stability of both the 3D model and the film becomes a critical and difficult issue. However the results can be spectacular with image depths of 5-6 metres possible and the (in focus) protrusion of the holographic image up to 600mm in front of the holographic film plane, possible.

External links

* [http://www.fou.uib.no/fd/1996/h/404001/kap02.htm Holographic Methods]


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • International Hologram Manufacturers Association — The International Hologram Manufacturers Association (IHMA) is a not for profit organisation designed to represent and promote the interests of hologram manufacturers and the hologram industry, worldwide. Founded in 1993, the association… …   Wikipedia

  • Benton, Stephen Anthony — ▪ 2004       American inventor (b. Dec. 1, 1941, San Francisco, Calif. d. Nov. 9, 2003, Boston, Mass.), became fascinated with holograms the first time he saw one and went on to invent the rainbow hologram, the type used on credit cards, which… …   Universalium

  • Stephen Benton — Infobox Scientist name = PAGENAME box width = image size =150px caption = PAGENAME birth date = 1 December, 1941 birth place = San Francisco death date = 9 November, 2003 death place = residence = |citizenship = nationality = United States… …   Wikipedia

  • Australian Holographics — was started with the specific objective to produce high quality large format holograms. After two years of research and development the company began commercial operations in 1991. Situated on convert|80|acre|m2 of rural farm land… …   Wikipedia

  • Holography — (from the Greek, ὅλος hólos whole + γραφή grafē writing, drawing) is a technique that allows the light scattered from an object to be recorded and later reconstructed so that it appears as if the object is in the same position relative to the… …   Wikipedia

  • Silver Millennium — The Silver Millennium, a fictional kingdom in the Sailor Moon metaseries, lies on the moon. It provides a setting for the past lives and future selves of most of the series major characters, and functions as a major driving force behind both plot …   Wikipedia

  • Marvel Universe Cards — were collectible trading cards based on the characters and events of the Marvel Universe. The first series was published by Impel in 1990. The cards featured categories such as Super Heroes, Super Villains, Rookies, Famous Battles and Team… …   Wikipedia

  • Computer-generated holography — (CGH) is the method of digitally generating holographic interference patterns. A holographic image can be generated e.g. by digitally computing a holographic interference pattern and printing it onto a mask or film for subsequent illumination by… …   Wikipedia

  • Vincent Presley — Infobox Musical artist Name = Vincent Presley Img capt = Img size = Landscape = Background = Birth name = Alias = Born = Origin = Instrument = Voice type = Genre = Indie punk Occupation = Years active = Label = Associated acts = URL = Notable… …   Wikipedia

  • Banknotes of Denmark, 1997 series — Danmarks Nationalbank is issuing banknotes of the Danish Krone (kr) and is in the transition of replacing the 1997 banknote series. As of September 2010 the 200kr, 500kr and 1000kr from the 1997 series are the currently circulating notes. The… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”