I've been making steady improvements to my technique to improve imaging of very dim plasmas. The latest results are as here. This is a spectrum of one of my 'crimzon doughnut' plasmas. I can't vouch for the scale. Much more to see now, compared with first attempt, above. Interpretations welcome.
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Spectrum interpretation...
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Chris Bradley
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Re: Spectrum interpretation...
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Richard Hester
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Re: Spectrum interpretation...
Chris - aim your spectroscope at a low pressure sodium street light, and you can at least calibrate on the intense sodium "D" line.
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Chris Bradley
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Re: Spectrum interpretation...
Sodium street light (high pressure type, judging by the brightness of it):
I will aim to improve this spectrum (actually quite difficult as it is a *very* bright source but with no background illumination of the scale, the inverse of the dim plasmas).
Looks to me like the 589nm and 569nm are showing up at around indicated 609 and 589, but the lower 475 and 466 are about right. So I'd judge this to say that it suggests the scale is about right in blue, drifiting to 20nm over-indicating at the red-end.
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I will aim to improve this spectrum (actually quite difficult as it is a *very* bright source but with no background illumination of the scale, the inverse of the dim plasmas).
Looks to me like the 589nm and 569nm are showing up at around indicated 609 and 589, but the lower 475 and 466 are about right. So I'd judge this to say that it suggests the scale is about right in blue, drifiting to 20nm over-indicating at the red-end.
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