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This page was last edited on 28 Novemberat The size of the reproduced image is again determined by the size of the disc; a larger disc produces a larger image.
However the maximum number of scanlines is much more limited, being equal to the number of holes on the disk, which in practice ranged from 30 towith rare hole disks tested. From Wikipedia, the free encyclopedia.
One of the advantages of using a Nipkow disk is that the image sensor that is, the device converting light to electric signals can be as simple as a single photocell or photodiodesince at each instant only a very small area a pixel is visible through the disk and viewportand so decomposing an image into lines is done almost by itself with little need for scanline timing, and very high scanline resolution.
Disco de Nipkow
Simple calculations show that, for equally sensitive photosensitive receptors, the iconoscope is hundreds to thousands of times more sensitive than the disk or the Farnsworth scanner. Iconoscopes and their successors accumulate energy on the target continuously, thereby integrating energy over time.
So the ideal Nipkow disk should have either a very large fe, which means smaller curvatureor a very narrow angular opening of its viewport.
A simple acquisition device can be built by using an electrical motor driving a Nipkow disk, a small box containing a single light-sensitive electric element and a conventional image focusing device lens, dark boxetc. Apart from the aforementioned mechanical television, which never became popular for the practical reasons mentioned above, a Nipkow disk is used in one type of confocal microscopea powerful optical microscope. This page was last edited on 15 Julyat By spinning the disk rapidly enough, the object seems complete and capturing of motion becomes possible.
The acquisition part of the system was not much better, requiring very powerful lighting of the subject. Light is conveyed into the sensing system as the small aperture scans over the entire field of view.
The patterns dw or may not partially overlap, depending on the exact construction of the disk. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file.
The devices using them were also noisy and heavy with very low picture quality and a great deal of flickering. A Nipkow disk sometimes Anglicized as Nipkov disk; hipkow inalso known as scanning diskis a mechanical, rotating, geometrically nipkiw image scanning device, patented in by Paul Gottlieb Nipkow. Please help improve this article by adding citations to reliable sources.
If the sensor is made to control a light behind a second Nipkow disk rotating synchronously at the same speed and in the same direction, the image will be reproduced line-by-line. March Learn how and when to remove this template message.
File:Disco nipkow svg – Wikimedia Commons
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. Description Disco nipkow The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. I, the copyright holder of this work, hereby publish it under the dr license:. The holes may also be square for greater precision.
File:Disco nipkow 24.svg
Views View Edit History. When the disk rotates, the holes trace circular ring patterns, with inner and outer diameter depending on each hole’s position on the disk and thickness equal to each hole’s diameter.
Another drawback of the Nipkow disk as an image scanning device: Articles needing additional references from March All articles needing additional references. Archived from the original on Unsourced material may be challenged and removed. These facts helped immensely in building nipkiw first mechanical television accomplished by the Scottish inventor John Logie Bairdas well as the first “TV-Enthusiasts” communities and even experimental image radio broadcasts in the s.
Idsco spinning the disk while observing an object “through” the disk, preferably through a relatively small circular sector of the disk the viewportfor example, an angular quarter or eighth of the disk, the object seems “scanned” line by line, first by length or height or even diagonally, depending on the exact sector chosen for niokow.