Nipkow disk

#1

Post by Hooke » Fri, Aug 02, 2019, 8:24 PM UTC

Nipkow disk
en.wikipedia.org

Re: Nipkow disk

#2

Post by sp332 » Fri, Aug 02, 2019, 8:30 PM UTC

I don't understand why you have to approximate straight scanlines by using a fraction of a really large disk. What's the disadvantage in using a smaller disk and letting the scanlines be curved?

Re: Nipkow disk

#3

Post by Koshkin » Fri, Aug 02, 2019, 8:34 PM UTC

sp332 wrote: post #2

I don't understand why you have to approximate straight scanlines by using a fraction of a really large disk. What's the disadvantage in using a smaller disk and letting the scanlines be curved?

With the large disk, the difference between the (linear) velocities of different holes is smaller.

Re: Nipkow disk

#4

Post by auggierose » Fri, Aug 02, 2019, 8:37 PM UTC

A descendant of this guy is hard at work in theorem proving: http://www21.in.tum.de/~nipkow/

Re: Nipkow disk

#5

Post by gdk » Fri, Aug 02, 2019, 8:50 PM UTC

William Osman tried to build a mechanical display around these: https://www.youtube.com/watch?v=R96TtG5FCTU

Re: Nipkow disk

#6

Post by vesinisa » Fri, Aug 02, 2019, 8:54 PM UTC

Here is an excellent in-depth explanation of the concept from one of my favorite educational YouTube channels - Technology Connections: https://youtu.be/v5OANXk-6-w

Re: Nipkow disk

#7

Post by inflatableDodo » Fri, Aug 02, 2019, 8:57 PM UTC

Thanks for this, I have been trying to remember the term 'confocal microscopy' for a while. https://en.wikipedia.org/wiki/Confocal_microscopy

Re: Nipkow disk

#8

Post by felipemnoa » Fri, Aug 02, 2019, 9:02 PM UTC

This is a really good short educational video about the invention of television:

https://www.youtube.com/watch?v=MyHAev_qJNU

Re: Nipkow disk

#9

Post by felipemnoa » Fri, Aug 02, 2019, 9:10 PM UTC

gdk wrote: post #5

William Osman tried to build a mechanical display around these: https://www.youtube.com/watch?v=R96TtG5FCTU

He seems to really be overcomplicating its construction with all those fancy 21st century electronics when in reality you can build it with early 20th century materials.

I wonder if a camera obscura would be enough to create the focused image instead of having to bother with lenses.

Re: Nipkow disk

#10

Post by lucb1e » Fri, Aug 02, 2019, 9:10 PM UTC

gdk wrote: post #5

William Osman tried to build a mechanical display around these: https://www.youtube.com/watch?v=R96TtG5FCTU

Set appropriate expectations before you watch this video, it was definitely educative and entertaining, but the emphasis is on 'tried'. I was a little disappointed that it didn't actually end up working.