Resolution and limitations. • Basics on phase retrieval iterative algorithms. • Some examples. • Fourier Transform Holography. • Holography with Extended. in Physics “for his invention and development of the holographic method”. Holography is Gabor's original setup for writing the hologram is described in Fig. 1. Publisher's PDF, also known as Version of record Near-field acoustic holography (NAH) is a powerful sound source identification tech-.
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Photo polymeric layer data-containing layer 6. Dichroic layer reflecting green light holography pdf ppt. Aluminium reflective layer Reflecting red light 9.
Laser Blue-green argon laser which is split into two beams, a reference beam and an object beam.
The interference pattern created by holography pdf ppt two beams forms the hologram. This array represents the data to be stored, and is usually implemented by a set of pixels on an LCD. An SLM can usually be refreshed at rates of about frames holography pdf ppt second. Multiplexing Agent It is used to allow the laser beam to access different pages in the hologram.
Acoustic holography - Wikipedia
Two types of multiplexing, shift multiplexing and angular multiplexing Shift Multiplexing uses a rotating disk to vary the angle of the laser beam, and so access a different view of the hologram. Angular multiplexing uses mirrors to change the angle at which the laser strikes holography pdf ppt crystal.
The CCD is used to read the interference pattern from the reference beam, and so read the information from the hologram. The matrix construction of the CCD allows it to holography pdf ppt all 1Mb of the data at once.
In holographic data storage, an entire page of information is stored at once as an optical interference pattern within a thick, photosensitive optical material.
This is done by intersecting two coherent laser beams within the storage material. The first, called the object beam, contains the information to be stored; the second, called the holography pdf ppt beam, is a simple light wave. When the two combine in an optical storage medium, they change the chemical or physical construction of that medium and so store the data.
If the storage medium is then illuminated with the reference beam again, the object data beam holography pdf ppt produced. Working Principle PowerPoint Presentation: Share to Twitter Seminar Topic: Three-dimensional holographic projection technology is based on an illusionary technique called Peppers Ghost.
It was first used in Victorian theatres across London in the s. Holographic projection is the new wave of technology that will change how we see things holography pdf ppt the modern era.
Some of the light scattered reflected from the scene then falls onto the recording medium. Several different materials can be used as the recording medium.
Acoustic holography - Wikipedia
A layer of this recording medium e. When the two laser beams reach the recording medium, their holography pdf ppt waves intersect and interfere with each other.
It is this interference pattern holography pdf ppt is imprinted on the recording medium. 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.
Holography pdf ppt missing key is provided later by shining a laser, identical to the one used to record the hologram, onto the developed film.
This produces a light field identical to the one originally produced by the scene and scattered onto the hologram.