Transcript holograms - WordPress.com

HOLOGRAMS
By: Sara S. Hassen
Mobile Media
29th March 2012
Holography is creating a
special photographic image
Hologram is a
photographic recording
of the image
Dennis Gabor
invented in 1948
Nobel Prize for Physics
in 1971.
In 1962, Emmett N. Leith
and Juris Upatnieks
• A photographic image
is variation of intensity
of reflected light.
• Holography
reconstructs the
appearance of an
object by recording
the phase
and amplitude of
reflected light waves
of a laser beam.
1. Continuous-wave
laser
holography
2. Pulsed-laser
photography
The object is hit with laser light.
The data is recorded onto a plate by
capturing the reflected, diffracted and
scattered light.
The plate acts as a diffraction grating.
When hit with a laser beam,
it again diffracts light in the
same angle.
The image then appears
pseudoscopic.
Repeating the process will
allow reconstruction of the
original image.
Continuous-wave
laser holography
Have
appeared
in news and
entertainment
How Does a Projector
Work?
The projection system has an
optical semiconductor known as
the DLP chip with up to 2 million
microscopic mirrors
The mirrors are directed by the
semiconductor, to reflect
greyscale light
To give color, the mirrors are
modified to reflect back only
certain colors of light
Basics of Projectors
•the white light
generated by the lamp
passes through a prism
that divides it into red,
green and blue.
• Each DLP chip is
identified for each of
these three colors
•the colored light that
the micromirrors reflect
is combined and passed
through the projection
lens to form an image.
•
•
•
•
Android 2.3 OS
480x800 screen
8.0 mega-pixel camera
3.7 inch WVGA Super AMOLED
display
• Texas Instruments DLP Pico
Projector
Four main parts
•the electronics system,
•a laser light source,
•a combiner optic
•scanning mirrors.
Minus:
• dimmed setting
• low resolution
• short distance
between the surface
and the projector
• white background
Plus:
• Long life, as opposed
to a lamp projector
• In business or other
presentations
• To make mass sharing
possible
• What else can you
think of?
• Thank you for listening!