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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

Manufacturer:Iwasaki
Model Reference:NHT150SDX/E50

File information

File information

Download: Download this File
Filename:anti-light.jpg
Album name:tuopeek / misc
Keywords:Miscellaneous
File Size:80 KB
Date added:Nov 15, 2018
Dimensions:1719 x 466 pixels
Displayed:102 times
Date Time:2018:11:15 21:52:08
DateTime Original:2018:11:15 22:39:36
Exposure Bias:0 EV
Exposure Time:1/250 sec
FNumber:f 7.1
Flash:No Flash
Focal length:20 mm
ISO:200
Make:NIKON CORPORATION
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-153255
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James
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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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Robert


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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.

tuopeek
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GLS on Tesla Coil


Tuopeek-475652085781113 tuopeek1 77334065@N05/
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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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