A DIY spectroscope for solar observing

For discussion on techniques and tips for visual observing
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rwilkinson
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A DIY spectroscope for solar observing

Post by rwilkinson » Tue Jun 14, 2011 8:29 am

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=c ... &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-d ... -unmounted

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rwilkinson
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Re: A DIY spectroscope for solar observing

Post by rwilkinson » Thu Jun 16, 2011 4:26 pm

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:
solartest.jpg
Splitting sunlight using the grating
solartest.jpg (227.76 KiB) Viewed 8983 times
and so I've been able to compare the spectrum from my fluorescent desk-lamp:
lamp2.jpg
Spectrum from a fluorescent lamp
lamp2.jpg (49.92 KiB) Viewed 9234 times
with the continous spectrum of daylight:
daylight2.jpg
Continuous spectrum of daylight
daylight2.jpg (36.85 KiB) Viewed 9234 times
I still need to do some experiments with the slit at the front...

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rwilkinson
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Re: A DIY spectroscope for solar observing

Post by rwilkinson » Tue Jun 21, 2011 6:57 am

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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