Green glow in gas

[lai...@wcoil.com]

I have several different plasma globes of different designs. Two of them
have clear glass and do have a white and distinctly green glow. One I
bought at Walmart on clearance, it is not a ball but more of a low dome.
The other is a Radio Shack Realistic Lightning Fury. These are not common
on E-bay but there is one up for bid right now. Auction 171211843616 not
my auction, don't know the seller. The seller says white but when it is
turned down to give the softer display there is a lot of green. I will
try to get some pictures. Often times these are hard to photograph and
have the colors come out as seen by the eyeball. Do some searches on gas
fills for plasma globes. I remember reading about how to get the different
colors. It has been several years since I read about the gasses.
Tim Laing

[Tidak Ada]

There was a very rare Russian thyratron 7-segmentdisplay a couple of years
ago on ebay. [http://www.decadecounter.com/vta/articleview.php?item=1019 ]
Also a Russian colour pixel display
[ http://www.decadecounter.com/vta/articleview.php?item=948 ].
Unfortunately bothe displays use the phosphor method to make colours.

eric


-----Oorspronkelijk bericht-----
Van: neoni...@googlegroups.com [mailto:neoni...@googlegroups.com] Namens
lai...@wcoil.com
Verzonden: zaterdag 11 januari 2014 18:35
Aan: neoni...@googlegroups.com
CC: lai...@wcoil.com
Onderwerp: [neonixie-l] Green glow in gas

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[petehand]

Nitrogen glows green - it's responsible for the green-ness of the Northern Lights. None of the other gaseous elements has a strong enough green line in its emission spectrum. Barium and cadmium do, but they're not gases.

The only green "nixie" I've ever seen appears occasionally in the bottom left of the screen in the Guitar Hero video game - irritatingly, I can't find a pic of the green one. It also appears in other colors, including traditional orange, and not lit up. I'm impressed by the realism - you can see reflections off the glass, the anode grid and the outlines of the unlit cathodes. Kudos to the game artists for putting a nixie in front of an audience that in all probability have never seen one in real life.

[greg...@hotmail.com]

Occasionally I get a small beautiful green spot in one of my 5092 nixie tubes. The digits all illuminate flawlessly, but given they are 50 years old I suppose it's some form of contamination. I wish I knew how it was produced because it's a really stunning shade of green. I will try to get a pic and post it.

I have some NE-2G bulbs, and yes they glow green, but it's a phosphor coating inside a neon bulb. The bulbs appear white when off, rather than clear. Hopefully the 2 pics are attached to this posting.

[Per Jensen]

On Jan 13, 2014, at 6:15 AM, greg...@hotmail.com wrote:

> Occasionally I get a small beautiful green spot in one of my 5092 nixie tubes. The digits all illuminate flawlessly, but given they are 50 years old I suppose it's some form of contamination. I wish I knew how it was produced because it's a really stunning shade of green. I will try to get a pic and post it.
>
> I have some NE-2G bulbs, and yes they glow green, but it's a phosphor coating inside a neon bulb. The bulbs appear white when off, rather than clear. Hopefully the 2 pics are attached to this posting.

Wow. That is a beautiful board ! A new project you are working on ? I'd like to see more about this :-)

// Per.

[greg...@hotmail.com]

Wow. That is a beautiful board ! A new project you are working on ? I'd like to see more about this :-)

That's my NH1CLK project, except I had to switch to Burroughs 6091 tubes because the NH1 (aka IN-1) tubes are horribly unreliable. Anyways, it's like a conventional clock with moving hand except this clock uses stationary NE-2 bulbs to simulate moving hands. I was able to fit 36 in a circle, so the hands "move" every 100 seconds. The inside is a dekatron spinning once per second. The outside digits are nixie tubes. At the top-of-the-hour, I have all the digits go dark except for the new hour that flashes 3 times.

 

The attached picture doesn't do justice to the clock; I dont mean to brag but in real life it look awesome. It's nearly 2 feet in diameter.

Now 36 hands, with 8 or 9 bulbs per hand. Yeah, that's 306 bulbs. During the power-up self test all bulbs are on and it's really bright.

The 'brains' of the clock are an Altera FPGA, coded in Verilog. The FPGA maintains the time (based on the 60Hz AC line frequency, which is extremely accurate long-term) and sends serial data for the hands and hours-digits to the main circular board. I used gEDA software to layout the PC board, and ran several SPICE simulations on the power supply and the clock line, which is 3 feet long. I had to make sure there were no reflections/glitches. After I finish my nixie watch (that's another story; all I can say is the PC board is done and it will look really cool) I will add a realtime clock on it for battery-backup.

I will make a second unit with green bulbs (NE-2G), and I've thought about using vacuum-fluorescent tubes for the outer hours-numerals. And instead of a dekatron in the center, it would be a 6E5 magic eye tube. I wish I could score a batch of NIMO tubes.....

[greg...@hotmail.com]

OK, here's a pic of the mysterious green glow I sometimes see in my 5092 nixie tube. It's towards the rear of the tube. Krypton has some green spectral lines, so maybe this tube has trace-amounts of Kr-86 to reduce ionization time. But after 50 years I would expect all of it would be gone considering it has a 10-year half-life.

I just wish I could find a way to create a nixie with this color.

[Instrument Resources of America]

It appears that this glow is actually on the INSIDE SURFACE of the glass
envelope of the tube. It is therefore most likely, in my opinion, a
fluorescence, occuring on the glass itself from internal electron
bombardment. This same exact phenomena occurs on the INSIDE SURFACE of
many electron tubes, for the same reason, but is normally a blueish
color, NOT to be confused with a gassy tube, where the bluish glow would
be between the internal elements rather than on the inside glass
surface. That's my two cents worth. Ira.

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[John Rehwinkel]

> OK, here's a pic of the mysterious green glow I sometimes see in my 5092 nixie tube. It's towards the rear of the tube.

Oh, that's nifty! I hadn't seen that effect before.

> Krypton has some green spectral lines, so maybe this tube has trace-amounts of Kr-86 to reduce ionization time. But after 50 years I would expect all of it would be gone considering it has a 10-year half-life.

I seriously doubt it's from krypton - while there are green lines, there are a lot of other lines as well, which normally dominate.

I don't think it's bulb fluorescence either, as the mean free path of an electron in neon of that pressure is too short, and there's not enough voltage available anyway.

Which leaves the mystery of what it really is. A spectroscope would shed some light (pun intended) on it. I'm guessing it's some trace metal that deposited there and gets ionized. Maybe a bit of getter material, or some insulation decomposed?

- John

[Tidak Ada]

May be it's due to a gas mixture. Don't forget there is also a bit of
mercury in the tube the also has some green in the spectrum.
However, the color reminds me more the color that will be seen by burning
copper-salts. The color on the photo is not reliable, so it's only a
guess...

eric

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[严泽远]

These pictures remind me I have some BLUE and GREEN neons in my drawer, I bouht them from a local supplier with about 0.2-0.3USD/pcs, it's beautiful, see the pictures attached ;-)

Yan.

在 2014年1月13日星期一UTC+8下午1时15分51秒，greg...@hotmail.com写道：