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'[EE:] Inexpensive Fiber Optic cable for light moni'
2004\10\10@132515 by Gus S.Calabrese

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Greetings


any suggestions of where to obtain
cheap fiber optic cable suitable for
monitoring visible light ?

For example:
A fiber that I could run from my rear
 tail lights to my dash so I can see
their operation.


Thanks



Gus S Calabrese
303.964.9670 w/vm   303.908.7716 cell no vm
http://www.omegadogs.com
4337 Raleigh St
Denver, CO 80212

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2004\10\10@141204 by Herbert Graf

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On Sun, 2004-10-10 at 13:25, Gus S.Calabrese wrote:
> Greetings
>
>
> any suggestions of where to obtain
> cheap fiber optic cable suitable for
> monitoring visible light ?
>
> For example:
> A fiber that I could run from my rear
>   tail lights to my dash so I can see
> their operation.

Not sure how bright you need it to be, but how about a heavy fishing
line? TTYL

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2004\10\10@175003 by Jinx

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> any suggestions of where to obtain
> cheap fiber optic cable suitable for
> monitoring visible light ?

You can get 1mm nylon that's pretty cheap (you don't define
"cheap" but I'm guessing the cost of glass would exceed it).
Hobby stores have it, eg Jaycar in Aus/NZ $22/4m retail

Don't know where it would be used commercially/industrially
(except those FO lights) so that maybe you could get cut-offs

You could be cheeky and ask at a telecoms or internet company
if they have any scraps. I got some by chatting to a road gang

> For example:
> A fiber that I could run from my rear
>   tail lights to my dash so I can see
> their operation.

Haha, they are that good-looking ?  ;-)

Do you want to detect when a bulb has blown ? A blown fuse
indicator is an LED+R across the fuse. Normally the fuse will
be short across the LED, but if it blows the LED lights. I haven't
tried but I'm sure this would work with a bulb filament too

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2004\10\10@175656 by Howard Winter

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Gus,

On Sun, 10 Oct 2004 11:25:21 -0600, Gus S.Calabrese wrote:

{Quote hidden}

Well I don't know about in the 'States, but Maplin here in England do a 1mm diameter fibre optic "cable" for £1.49 a metre - probably cheaper (no VAT) if sent outside Europe:   ( http://www.maplin.co.uk/  - search for reference XR56L )

I use some of this to monitor my electricity meter, which has lights indicating consumption and day / night rates, from outside the cupboard-under-the-stairs.

Cheers,



Howard Winter
St.Albans, England



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2004\10\10@181355 by Victor Faria

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Jameco
www.jameco.com/webapp/wcs/stores/servlet/CatalogSearchResultView?langId=-1&storeId=10001&catalogId=10001&searchType=k&searchValue=fiber&categoryId=11411
$6.95 for 10'
victor
{Original Message removed}

2004\10\10@182656 by Jinx

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> Not sure how bright you need it to be, but how about a heavy
> fishing line? TTYL

That's a good suggestion. Most fishing line is quite yellow or
cloudy (no one thought to ask Gus at formulation stage) but
there are one or two that might be passable over a few metres.
I found a hand line ages ago, probably 0.6mm, OK-ish, but
high attenuation. A viewable difference between light on or off,
a photodiode receiver amp would give a more usable output.
You'd probably need to do this whatever cable is used

Spec for Jaycar 1mm cable is -400dB/km @ 650nm (red)

Radiospares' 1mm cable, NZ$110/20m, is -200dB/km at
665nm and -1500dB/km @ 820nm (infra red)



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2004\10\10@193123 by William Chops Westfield

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On Oct 10, 2004, at 2:49 PM, Jinx wrote:

> You could be cheeky and ask at a telecoms or internet company
> if they have any scraps.

Telecom fiber is very tiny, and not the sort of thing you want
to use if you're trying to have humans SEE light through it.

Try here:
    http://www.thefiberopticstore.com/

Their 4x0.75mm jacketed cable seems to me like it would work pretty
well in the applications you mentioned.  About $0.33/foot...

BillW

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2004\10\10@194804 by Jinx

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> Telecom fiber is very tiny, and not the sort of thing you want
> to use if you're trying to have humans SEE light through it.

Agreed. However Gus didn't say what he actually wanted to do.
Any cable will transmit the light from the rear but is this for viewing
or what ? Light coming out of the end of even a 1mm cable is pretty
directional (which is OK for just the driver to see I guess), but you
could strip a mm or two off the sheath and rough up the end to make
a dim "LED". If it's not for direct viewing, eg simply for on/off status,
then it needs to be detected and converted to a more viewer-friendly-
no-squinting-required display or some other indicator. In which case
there would be easier and cheaper ways of doing it

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2004\10\10@200329 by Jinx

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>      http://www.thefiberopticstore.com/

Wow, it's like I died and went to hippy heaven......... ;-)

Pretty good prices (compared to retail cable anyway) for
combo packs and they ship o/seas too

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2004\10\11@055435 by No Religion

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At 16.31 2004.10.10 -0700, you wrote:
>On Oct 10, 2004, at 2:49 PM, Jinx wrote:
>
>Try here:
>    http://www.thefiberopticstore.com/
>
>Their 4x0.75mm jacketed cable seems to me like it would work pretty
>well in the applications you mentioned.  About $0.33/foot...

Can it be used for high bandwidth communication purposes?

Greets,
N.R.

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2004\10\11@111044 by hael Rigby-Jones

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{Quote hidden}

That is amazingly lossy compared to single mode fibre used at 1550nm which
gives an attentuation of only about 0.22dB/km!

Regards

Mike

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2004\10\11@120929 by William Chops Westfield

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On Oct 11, 2004, at 3:55 AM, No Religion wrote:

>> Their 4x0.75mm jacketed cable seems to me like it would work pretty
>> well in the applications you mentioned.  About $0.33/foot...
>
> Can it be used for high bandwidth communication purposes?
>
No.

Depending on your definition of "high bandwidth", of course.
High bandwidth fiber is glass, single mode, very small diameter
stuff.  OTOH, this would probably work as well as air, only around
curves, for low-bandwidth stuff (say, IRDA speeds: 4Mbps)

BillW

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2004\10\11@151748 by Richard.Prosser

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0.22db at 1550nm is still lossy. We used to measure down to ~0.16dB/km at
this wavelength for singlemode fibre. (I think the theoretical minimum is
about 0.15 dB/km ? Can't remember.)     About 0.35dB/km at 1300nm
And then for multimode fibre (higher doping levels) we'd get down to about
3dB/km at 900nm, and up to about 6dB/km or so on good fibre at 850nm.

At visible wavelengths the losses are higher again, but on multimode you
could still "see" through several km of fibre. You could with singlemode
too, but yoy needed a microscope as the core size is only about 10microns.

Plastic fibre is much, much,  more lossy. But the core size is larger, so
you get more light into it to start with, it's used in short length (has to
be, the bandwidth is poor also), and is cheap, as are the connectors and
interfaces.


RP



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