Holography new

3D Representation

In Greek, “holos” means whole, and “gramma“means message.The definition of holography is a technique which render subject with complete dimensional fidelity.

Holography

Holography

The term ‘hologram’ can refer to both the encoded material and the resulting image.

The recordmeans the encoded material (Photosensitive plate) It is the recor-

ded interference pattern of constructive (intensity peaks) and destructive

(elimination) of the superimposed light-wavefronts (the electromagnetic field).

The resulting means image.

Left: A laser beam – the central element for creating a hologram.

Right: Laser hologram projection of dragonfly

by Martina Mrongovious, Hover 2004

Holograms are made using a LASER which produces a special kind of light in one pure colour.

This light has the ability to

transfer information about an object’s surface characteristics and location in 3D space, to a light sensitive plate.

Down left: A plane wave passing through a barrier (traveling left to right), resulting in diffraction and interference Left: The basic set up for produ-

cing a ‘master’ laser transmission hologram

Middle: when hologram recording, it only record intensities (amplitude)

Right: The optical set up for a reflection hologram copy.

Formation of ImageThe essence: Two steps of image formation: First step

is to build a hologram, the object is transformed into a photographic record.

Second is to

make reconstruction, which transform the hologram into the image.

Hologram is the result of

interference.

The signal means light diffracted by the object.

A Moiré pattern results from the interference of two similar undulating patterns, such as stripes The Moiré pattern shown above is from the superposition of a shifted wave-pattern (source Kafri 1990, p31)

Holography

types of display holograms

Paula Dawson To Absent Friends, 1989 | One of the laser transmission holograms, 150 x 95 cm.

Two perspectives showing the details of the scene from small holograms 4 x 5� (10.2 x 12.7 cm)

Up left: Iùaki Beguiristain, Telephone – Theydon Bois 2286, 2001 Down left: Holograms by Ana Maria Nicholson,

Two-colour (colour mix) reflection holograms from pulse laser masters (images courtesy of the artist)

Transmission holograms is formated where light shone th-

rough Reflection hologram is in which the hologram

reflects light

Right: Hans Bjelkhagen, BejeweledFish True colour

(panchromatic) reflection hologram

Holography

Michael Bleyenberg’s ‘light architecture’ Left: EyeFire Centre: AugenFeuer

Right: Design for a light façade roof

Computer generated ‘digital’ holography: With computer generated ‘digital’ holograms the fringe pattern

of each pixel is calculated and recorded into the hologram.In early systems these Hogels were noticeable

causing the surface of the hologram to look pixilated.

Left and Centre: Geola Technologies Ltd Motor-

bikeRight: Zebra Imaging Downtown Seattle Holographic Print Computer generated digital hologram

Dot-matrix hologram printing is a technique of building up an image of diffractive ‘pixels’.Each area is recorded with

a particular geometry that diffracts light by a corresponding angle. The illuminating light is deflected into varying divergent

colour-spectrums. The image is a tiling of colours which means the images are very bright but do not have 3-d depth

information.

Dot-matrix holograms have been used as a means of decorative ‘light architecture’.

Other application

Except those benefit our application in life.

Art, there‘s also other usage that

Up left: Data storage Blu-ray Disc reach the limit of possible data density (due to the diffraction-limited size of the

writing beams.

Down left: Security Bill, passport, credit card

Right: Art Fashion show, Custom Imaging