little help, please

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phuphuphnik
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little help, please

Post by phuphuphnik » Thu Feb 02, 2017 5:56 am

I'm working the kinks out of a Lockyer style spectrometer, and I am having a few issues. Where should the second telescope focus, the slit?
To better explain, as y'all know it goes objective, slit, lens, prism chain, then the second telescope. I'm getting lovely projection of the lines on a bit of card, but I'd really like to finish it up.
Image

I'll be adding another slit for a prominence spectroscope, then eventually a spectrograph, but one thing at a time.

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Merlin66
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Re: little help, please

Post by Merlin66 » Thu Feb 02, 2017 9:36 pm

<name?>,
An interesting project....a four prism train is a challenge to align!!
The imaging telescope behind the prisms should be focused to infinity if the set-up is correctly collimated.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

phuphuphnik
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work continues

Post by phuphuphnik » Thu Mar 09, 2017 5:09 am

Have the final form just about there. Need to work on focus and putting a brass box around it to shade the light. That is a Mercury lamp at the end there. I can see the lines, but they are not sharp because it is so lose, I think.
I am also putting together a wire diffraction grating to make a little Fraunhofer spectroscope. Also in the works is a ruling engine to make some gratings.
Cheers,
Chriso

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Merlin66
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Re: little help, please

Post by Merlin66 » Thu Mar 09, 2017 5:39 am

Chriso,
Very nice.
You should consider the Browning mechanism to keep all the prisms working at maximum efficiency at their minimum deviation angles....
Browning aligned prisms 1870.pdf
(402.85 KiB) Downloaded 34 times
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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