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Old 2020-05-12, 16:59   #1
xilman's Avatar
May 2003
Down not across

2×3×5×379 Posts
Default Home made spectroscope.

IMAO this is wonderful.

I'm going to make one.
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Old 2020-05-19, 00:58   #2
Spherical Cow
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Nov 2004

22·33·5 Posts

Very clever- Yes, I think I see a spectroscope in my future.
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Old 2020-07-12, 16:01   #3
kriesel's Avatar
Mar 2017
US midwest

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The article is ambiguous about gases producing lines. It's low-pressure gases that emit or absorb sharp lines. High-pressure gases produce continuous spectra.

For calibration, approach, or with a mercury-vapor fluorescent light works well.
There was a web site years ago that allowed uploading jpg files from a digital camera and produced labeled and scaled wavelength images from them, by identifying peak intensities corresponding to well known emission lines, but I've lost the URL.
Digital cameras are often capable of detecting slightly-UV lines as well as near infrared.

On resolution versus range,
cd 1.6 um track spacing
dvd 0.74 um
blu ray 0.32 um

Last fiddled with by kriesel on 2020-07-12 at 16:16
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