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Light Absorber

Light Absorber

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Thanks to James for pointing this nice demonstration out. This arc tube has just cooled enough to have stopped emitting. Still with a high internal pressure, but not excited, it is now absorbing the spectrum it had been emitting. It fades to a light blue before disappearing quickly as it cools. Unlike the low pressure lamp this is noticible under white light.

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Light Information

Light Information

Model Reference:NHT150SDX/E50

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Album name:tuopeek / misc
File Size:80 KB
Date added:Nov 15, 2018
Dimensions:1719 x 466 pixels
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Date Time:2018:11:15 21:52:08
DateTime Original:2018:11:15 22:39:36
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Exposure Time:1/250 sec
FNumber:f 7.1
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Focal length:20 mm
Model:NIKON D3400
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Nov 16, 2018 at 01:03 AM Author: James
Well captured Mark! The Iwasaki SDX lamps are great to see this because the sodium vapour pressure is very high, but the PCA tube also has low thermal mass which cools rather quickly. So as soon as it has cooled below incandescent temperatures you have a few tens of seconds where it appears to be filled with pale blue-green colour vapour due to the absorption of sodium wavelengths. The effect is especially strong if you use a triphosphor cool white fluorescent to illuminate the cooling sodium arc tube.
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Nov 16, 2018 at 06:26 AM Author: rjluna2
That is an interesting phenomenon, Mark

Pretty, please no more Chinese failure.


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GLS on Tesla Coil

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Nov 16, 2018 at 09:36 AM Author: tuopeek
Yeah Robert, it's great when a bit of physics theory becomes a practical demonstration.
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