A Cheap Fibre Optic Star

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A Cheap Fibre Optic Star

Postby psychobilly » Wed May 28, 2008 5:56 pm

Well here it is... total cost about £15 in the batteries...

[image]local://2658/2B718850E764499C81351281A3A7F728.jpg[/image]

The fibres start for a few quid on [url=http://cgi.ebay.co.uk/1M-ST-to-ST-FIBRE-OPTIC-PATCH-LEAD-62-5-125-BRAND-NEW_W0QQitemZ9713401509QQihZ019QQcategoryZ28023QQrdZ1QQssPageNameZWD1VQQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247]ebay[/url] and they are dual fibres with one 62.5um and one 125um fibre side by side...

The 62.5um turned up today courtesy of a fellow forum member and Thanks very much for it [:D]

Here's the results using the approx 0.8mm plastic fibre that comes with the kit at 36m

[image]local://2658/E0B65C7B875B4CEBA360A71609191F26.jpg[/image]

and here's the first star test image capture with a Meade DSI II C at f6.3 on the CPC800XLT after initial collimation 2x60s exposures autoguided

[image]local://2658/DAE8634D61854EC3AA7198C016488D6C.jpg[/image]

Collimation is still a bit out and needs some very slight adjustment..


Billy..




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RE: A Cheap Fibre Optic Star

Postby Chanctonbury » Wed May 28, 2008 6:46 pm

Excellent, Peter, a nice bit of construction!
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RE: A Cheap Fibre Optic Star

Postby psychobilly » Wed May 28, 2008 6:46 pm

Hi Steve.. it's hardly construction...

It's a level on kit designed for primary level CDT only required creeing two wires into a terminal block with the LED and putting the batteries the right way round in the battery box...oh and cutting the plastic led fibe coupler to length to match the SMA...

I will prob glue the led to the battery box istead of having it on flying leads......

like this....

[image]local://2658/79A2679FFCDC4CEFAE6253414EC1CDFE.jpg[/image]

and make a disc a few inches in diameter with a mounting hole for the fibre in the center with a tripod bush on the back so I can mount the output end on a pan and tilt head with my macro xy stage on it aswell so that i can position the fibre on the optical axis of the scope.

Billy...




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RE: A Cheap Fibre Optic Star

Postby Chanctonbury » Wed May 28, 2008 7:53 pm

I assumed it was a kit of parts - I have built several electronic kits from Maplin (normally badged 'Hellermann' I seem to recall) so it semed logical that you had done so with this project!
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RE: A Cheap Fibre Optic Star

Postby psychobilly » Wed May 28, 2008 7:53 pm

HI Skywatcher,

The kit of parts consisted of...

a battery box and switch with wires all pre-assembled
a piece of 2 way terminal strip
the ultrabright white led
the led fibre coupler
the 0.8mm plastic fibre
a piece of sticky back luminous plastic (handy for marking bits of astro kit)
and a small sheetmetal screw driver..

all you needed to add was 2 AA cells :)


The 0.8mm fibre is a bit on the big side for the fibre star unles you fancy setting it up a few hundred metres away.

I did try melt drawing the plastic fibre but its tricky and will probably become mis-shapen which defeats the obect of the exercise somewhat - to produce an earth bound star analog.

I also tried making apertures in stacks of aluminium foil with a sharp pin.

The best option is to "buy" either a 50,62.5 or 125 um fibre (they are used in optical computer networks) dont use a TOS-link cable the core is too big.

Billy...

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RE: A Cheap Fibre Optic Star

Postby psychobilly » Sun Jun 01, 2008 12:30 pm

Here it is with the 6" diameter "tufnell" disc an a heath robinson fibre socket on the back tahts holds the SMA connector on the 62.5um fibre...All Mounted on an Adjsutable Macro Stage to give X-Y translational and a 3 Way Pan and Tilt head for rotational alignment - the tripod colub adjusts for height. All this is so that I can get the fibre star centerd on the optical axis of the Scope OTA at a distance ....via walkey Talkies as the OM is a bit "mutt and jeff"

[image]local://2658/AF3BE4CB93484C8D93ED6C7CFDE8AD9D.jpg[/image]

Just got to give the front disc a coat of matt black paint...and add some luminous arrows round the edge - using the sticky back luminous film that comes with the maplin kit...



Sorted :)





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