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 Post subject: A DIY spectroscope for solar observing
PostPosted: Tue Jun 14, 2011 8:29 am 
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I found this article on a simple DIY project for observing and imaging the sun very interesting - another example of Blue-Peter Technology!
http://www.euhou.net/index.php?option=com_content&task=view&id=178&Itemid=13

Furthermore, if you don't want to make your own diffraction-filter from an old CD or DVD, then I've found a source of cheap (£2 + postage) proper ready-made grating-film:
http://curiousminds.co.uk/holographic-diffraction-grating-film-unmounted


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 Post subject: Re: A DIY spectroscope for solar observing
PostPosted: Thu Jun 16, 2011 4:26 pm 
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I didn't have much success converting an old CD into a diffraction grating, but the proper one which I ordered from CuriousMinds arrived the following day, so I needn't have bothered.

Anyway, I've just built my mk1 prototype, using the 500 lines-per-inch grating film:
Attachment:
File comment: Splitting sunlight using the grating
solartest.jpg
solartest.jpg [ 227.76 KiB | Viewed 6138 times ]

and so I've been able to compare the spectrum from my fluorescent desk-lamp:
Attachment:
File comment: Spectrum from a fluorescent lamp
lamp2.jpg
lamp2.jpg [ 49.92 KiB | Viewed 6389 times ]

with the continous spectrum of daylight:
Attachment:
File comment: Continuous spectrum of daylight
daylight2.jpg
daylight2.jpg [ 36.85 KiB | Viewed 6389 times ]

I still need to do some experiments with the slit at the front...


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 Post subject: Re: A DIY spectroscope for solar observing
PostPosted: Tue Jun 21, 2011 6:57 am 
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I've built two of these, which I'll bring along to our next two meetings.
The solar spectrum is bright enough to see even on a cloudy day (but not in the rain, as the cardboard tube is not waterproof!)


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