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Spectral Tutorial Pt-4

Spectral Tutorial Pt-4

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Iwasaki HT-400

HgDG-IMG-02rmjpg.jpg HgDG-IMG-01drm.jpg HgDG-IMG-01drn.jpg HgDG-IMG-01crm.jpg

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Filename:HgDG-IMG-01drn.jpg
Album name:Globe Collector / Miscelaneous Lamp related stuff
Keywords:Lamps
File Size:137 KB
Date added:Aug 07, 2019
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URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-162826
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Globe Collector
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Aug 07, 2019 at 05:51 AM Author: Globe Collector
PARAPHRASING OF ABOVE TEXT, just in case it is difficult to see against the picture.

"Here a monochromator has been placed between the lamp and the camera. In this case we are looking through the (transmission) grating at the arc tube. If we were to use a REFLECTION grating, like a CD or DVD we would be looking at the reflection of the arc tube in the CD or DVD rather than looking (straight) through a semi transparent (transmission) monochromator(/grating) as here, but the underlying principles are the same.

When we place the monochromator in the (optical) path coloured images of the arc tube appear either side of the main image (called zero blaze), one image in each monochromatic colour emitted by the source (on either side in this view).

Many stop here and seek to go no further, satisfied by what they see, but little can be gleaned from this pretty coloured picture as the spectral resolution is far too low.

ADDENDUM

Looking through a transmission grating like used here is like looking out a window...the lamp can be seen outside, but so can the coloured images...like "coloured ghosts" that arn't really there, but you can treat them is if they ARE there and zoom in on them with the camera for more detail. This is part of the key to high resolution.

The reflections in a CD or DVD are slightly curved as the tracks are spiral, this distorts the images but not the colours. A CD or DVD as a monochromator requires somewhat more "fiddling about" and a bit more..."just don't quite get it, tweak it, get a bot closer, tweak it again" type looping iteration.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Aug 07, 2019 at 10:02 AM Author: Daniel f
It really has a color that hypnotizes. I like color blue . very pretty
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Aug 07, 2019 at 05:52 PM Author: Globe Collector
Monochromatic colours are very entrancing.....pity our computer screens have no hope of reproducing them.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Aug 09, 2019 at 04:20 PM Author: Daniel f
It is true . It has to be awesome. the screen falls too short to convey that sensation!
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Aug 09, 2019 at 07:04 PM Author: Globe Collector
https://en.wikipedia.org/wiki/RGB_color_space

You will need to translate the whole page to Catalan.

Manufactured articles should be made to be used, not made to be sold!

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Aug 10, 2019 at 02:15 AM Author: Daniel f
I have seen the colored cube. It is very interesting although for me this topic is very big. But the light color is awesome. did the color resemble the osram HgH discharge lamp?
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Aug 10, 2019 at 03:01 AM Author: Globe Collector
Basically almost all mercury lamps give much the same spectrum....only the really high pressure ones are different.

Manufactured articles should be made to be used, not made to be sold!

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Aug 10, 2019 at 03:22 AM Author: Daniel f
Although I do not collect these lamps are very beautiful. very collectible Unfortunately, incandescent bulbs are terribly expensive. As they are big, it catches my attention. People usually associate a homemade but huge bulb.
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Aug 10, 2019 at 03:50 AM Author: Globe Collector
Discharge lamps can be very rare and expensive too...

Here are some of the rarest...

https://www.lighting-gallery.net/gallery/displayimage.php?album=search&cat=0&pos=0&pid=63777 North American A-H2, 1939

https://www.lighting-gallery.net/gallery/displayimage.php?album=search&cat=0&pos=3&pid=114903 British MAF/V 1930's-'60's

https://www.lighting-gallery.net/gallery/displayimage.php?album=search&cat=0&pos=4&pid=161370 IGAR-2 Soviet Medium Pressure Hg, Mid 1950s.

Manufactured articles should be made to be used, not made to be sold!

Fee, Fye, Fow, Fum, A dead man's eye and a parrot's BUM!

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Aug 10, 2019 at 05:03 AM Author: Daniel f
you're right . They are very rare. Maybe 10 years ago they were easier to get or try at least. If something I understand is that the most special bulb can come to the root of a more common one! I discovered my siemens 2kw following an old osram gls of 1000w and 125v. I just asked him if he had more and he showed me that pretty bulb
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