Television Programs Sent on Light Beams (Mar, 1932)

Why would this be better than radio? Isn’t radio already a “fog penetrating light”?

Interestingly this kind of thing is currently being considered, but for wireless networking, though an important distinction being that it is done inside a room, not in the open.

Television Programs Sent on Light Beams

TELEVISION transmitted on a light beam, opening the way to a new era in the art of broadcasting, has been successfully demonstrated at Schenectady, N. Y. by Dr. E. F. W. Alexanderson, noted radio engineer.

In the laboratory tests, instead of the electric impulses being fed into the radio transmitter as heretofore, they were modulated into high frequencies on a light beam from a high-intensity arc. This beam was projected the length of the laboratory into a photo-electric tube, which transformed the light waves back into electric impulses. These latter impulses reproduced the original image by means of an ordinary television receiver.

Light-transmitted television points the way to the development of a new method of communicating with planes whereby a fog penetrating light, modulated into voice waves, is projected to photo-electric cells on the wings of a plane, so that landing directions may be transmitted through fog for prevention of smash-ups

6 comments
  1. Hirudinea says: October 20, 20111:55 pm

    There are a lot of problems with using light to transmit information which is why radio waves dominate to this day (excluding fiber optic and tv remotes of course.)

  2. Andrew L. Ayers says: October 21, 20112:55 pm

    Actually, Charlie: http://en.wikipedia.org…

    Also – on the “homebrew” front: http://ronja.twibright….

  3. Charlie says: October 21, 20113:36 pm

    Andrew L. Ayers » Those are line-of-sight, not broadcast.

  4. Casandro says: October 21, 201111:18 pm

    Well the in-door LED networking is just as stupid as this. It doesn’t solve any problems, it’s just there to blow some government money.

    In a Nutshell:
    It’s not resilient to eavesdropping as light also get reflected and you need special hardware behind transparent plastics.

  5. Casandro says: October 21, 201111:18 pm

    But to make it clear, for line of sight applications, optical communications has a place as the regulatory processes are a lot simpler.

  6. Steve Weiss says: October 28, 20116:50 am

    The first point-to-multipoint “microwave” system?

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