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UltravioletPhotography

WOW, spectrum of an uncovered Godox AD200 flash


colinbm

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Well, if that is real, you have a big problem. But I think the real reason for that peak is the spectrometer, although I don't know what it could be. Some members who know how to use a spectrometer will surely be able to help you more than me.
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Obviously the UVC peak is useful for UVC fluorescence.. ;-)

But I haven't seen a Xenon spectrum like this before ?

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  • 3 weeks later...
This is an fine example of the limitations of such instruments and has been discussed at length on this forum. Single fixed grating, linear array detector spectrometers are known to have unacceptable stray light rejection at short wavelengths. Every bit of that huge peak below 325nm in the first post is artefact.
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This is an fine example of the limitations of such instruments and has been discussed at length on this forum. Single fixed grating, linear array detector spectrometers are known to have unacceptable stray light rejection at short wavelengths. Every bit of that huge peak below 325nm in the first post is artefact.

 

Thanks John

I have asked the manufacturer about the truncated data at the UV end & this is their response, below, which I now understand better & it is only a small problem that I can cope with now that I am better informed.

The solution is a specialist UVC spectroscope....

 

" For the sun light, they do have big difference in the radiance ratio of Visible light and UV light.

Because the CCD dynamic range, it is 1300:1, so if UV light ratio is under 0.5% of Visible light, then it will not be shown.

It means compare Visible light and UV light , the UV light is very little little radiance.(100 to 0.5) "

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I have tried again to get a proper spectrum of the bare Godox AD200, this seems to be more accurate.

 

post-31-0-03323700-1619082577.png

 

Oh no Colin you missed out on your chance for a research publication. Remember this:

https://www.ultravioletphotography.com/content/index.php/topic/4445-paper-from-a-bad-science-journal-deadly-ultraviolet-uv-c-and-uv-b-penetration-to-earth%e2%80%99s-surface/

 

But you need to give a tree a sunburn with the flash. That would have clinched it.

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