Re: TI-H: Re: Laser Network (OT)
[Prev][Next][Index][Thread]
Re: TI-H: Re: Laser Network (OT)
often what is done in laser networks that require (almost) constant
transmission is the beam is split into six or eight separate beams in a
radial cylindrical pattern, so rain doesn't disrupt it because one beam
(almost) always gets through. the downside, of course, is that the range is
slashed.
--nick
Nick Foster / Bistromath / zaphod@coe.neu.edu
KeyID 2048/1024 0x663CB446
6CAF FFD4 F9BA 64BA ECF9 032E 7402 3886 663C B446
----- Original Message -----
From: "Giles Pollock" <glp71s@MailAndNews.com>
To: <ti-hardware@lists.ticalc.org>
Sent: Tuesday, March 28, 2000 10:51 PM
Subject: RE: TI-H: Re: Laser Network (OT)
>
> Maybe you could use a fat laser, to prevent rain from disrupting it and i
dont
> know many birds that hang around the tops of skyscrapers here... use a
> collecting mirror to concentrate the beam into a thin beam ath the
reciever
> end... aiming the laser would be easy... use a second laser, a small
mirror
> and some photodiodes to keep the system aimed, reflect the second beam off
the
> mirror and back onto a series of photodiodes, if it went too far wide, it
> would shine on one of the other diodes and this could be used to trigger a
> servo motor or something... when it touched a center diode, it would shut
the
> servo off... using a collector, it wouldnt matter about small vibrations,
only
> about big ones... if you wanted to stop birds, have two lasers
transmitting
> the same data at once, if a bird flew through one, the other one would
still
> transmit... use a fat or very powerful laser and you could run the laser
> around raindrops, or even vaporise them before they disrupted the data
> transfer... they do focus the laser a bit, but not much...
>
> >===== Original Message From ti-hardware@lists.ticalc.org =====
> >On Tue, 28 Mar 2000, Bernard wrote:
> >> ...I don't think an laser would be good for any wireless comunications
> >> saying that it could be interupted easly by a Periguin flying right
through
> >> or even a crow or even the common rain shower would interupt lasers.
> >
> >Yup, and have you ever tried pointing a laser over any appricable
> >distance?
> >
> >I have, and its not easy. Once you have it lined up, you still have to
> >worry about it drifting, and vibration in the mounting. Over more than a
> >few hundred meters even slight vibrations are an issue.
> >
> >
> >dk
>
>
>
References: