Is this just a normal fluorescence of glass molecules?

  • #1
201
25
hi guys

i recently had built a HV power supply out of an old Flyback transformer i had laying around , i think it produces about 10KV ~ 15KV not very sure but it could arc at about ( 6mm in air ) ,

14493440bd44992f6a0dd1a494b7ae4181cf9062503d8cb3309def5fdac43e54d4525fd8.jpg

and as you can see i tried to connect it to a 15W smal light bulb ( the positive terminal is connected to the strange looking rod you see on the left which is just touching the glass ) and i saw that strange effect .
( i don't know but i think its just the highly energetic electrons exiting the glass molecules which causes it to flurecence ) , give me your opinion on what is this ?! and could this apparatus produce xrays ?!
 

Attachments

  • 14493440bd44992f6a0dd1a494b7ae4181cf9062503d8cb3309def5fdac43e54d4525fd8.jpg
    14493440bd44992f6a0dd1a494b7ae4181cf9062503d8cb3309def5fdac43e54d4525fd8.jpg
    124.4 KB · Views: 716

Answers and Replies

  • #2
Spinnor
Gold Member
2,176
384

Attachments

  • upload_2018-7-5_17-51-5.jpeg
    upload_2018-7-5_17-51-5.jpeg
    7.7 KB · Views: 421
  • #3
201
25
the argon glow discharge is very far of this color plus i have another gas tube filled with argon and it produces a purple discharge thats a photo of it :
DSCF3692.jpg

the other glow is more of a yellowish green glow ( it doesn't seem to be glow discharge either ) its more like of a momentary flashes not a continios glow
another thing i have to mention is that the filament is broken and its impacts rapidly with the glass of the bulb could this be the cause or anything ?!

i just want to know these electrons are exiting what ?! because it doesn't seem to be the gas inside the bulb for some reason !
unfortunately i dont have a prism or a diffraction grating .
 

Attachments

  • DSCF3692.jpg
    DSCF3692.jpg
    121.5 KB · Views: 448
  • #4
Spinnor
Gold Member
2,176
384
In the second picture you posted the color seems pretty close to the one I posted, :woot:

It is hard from the pictures to see where the light is actually coming from, does it look like it comes from inside the bulb?

the filament is broken and its impacts rapidly with the glass
More physics at work, neat! Electromagnetism at work?

More small bulbs needed?
 
  • #5
201
25
In the second picture you posted the color seems pretty close to the one I posted, :woot:

It is hard from the pictures to see where the light is actually coming from, does it look like it comes from inside the bulb?

More physics at work, neat! Electromagnetism at work?

More small bulbs needed?
yes! it comes from inside the bulb .

what really confuses me is that the glow doesn't match any of the nobel gases glow discahrge :

40e72863758b3e4b49ebc403d2258bc2.jpg

so , could this be from exiting the glass molecules or any thing ?!
i read some where that the yellowish green glow in the glass is somewhat an indication of xrays ?! is that correct ?
or i couldn't be producing xrays with relativaly low voltages ( 10 ~ 15 KV )
 

Attachments

  • 40e72863758b3e4b49ebc403d2258bc2.jpg
    40e72863758b3e4b49ebc403d2258bc2.jpg
    18.6 KB · Views: 342
  • #6
Tom.G
Science Advisor
3,767
2,449
Perhaps a mixture of gasses? Break the bulb to find out if it is the glass.
 
  • #7
127
39
It looks somewhat like the glow discharge of krypton in the photo below. A special incandescent light bulb (A) filled with inert krypton gas is touching a plasma globe (B). A discharge occurs through the krypton gas in the light bulb, emitting greenish light. The spectrum of the discharge as seen by a hand spectroscope (C), corresponds with a krypton spectrum found on internet (D). Even the violet lines are present.

So you might get a stronger emission from your 15 W light bulb by holding it next to a plasma globe.

combi2.jpg
 

Attachments

  • combi2.jpg
    combi2.jpg
    46.6 KB · Views: 688
Last edited:
  • Like
Likes Spinnor and Tom.G
  • #8
201
25
It looks somewhat like the glow discharge of krypton in the photo below. A special incandescent light bulb (A) filled with inert krypton gas is touching a plasma globe (B). A discharge occurs through the krypton gas in the light bulb, emitting greenish light. The spectrum of the discharge as seen by a hand spectroscope (C), corresponds with a krypton spectrum found on internet (D). Even the violet lines are present.

So you might get a stronger emission from your 15 W light bulb by holding it next to a plasma globe.

View attachment 227817

thank you spareine , krypton! i didn't see that one coming :) LOL
but i have a question : isn't krypton is much more expensive than argon to use it for filling a regular light bulb ?
 
  • #9
127
39
Yes, the krypton light bulb cost about 2 euros, so it is more expensive than an ordinary bulb, but still within budget. :smile: I don't know whether krypton extends the lamp's life more than the cheaper argon, but I bought the krypton light bulb just for this experiment.

(I bought a xenon light bulb as well (same price), and its glow discharge emits a similar greenish light, but I did not succeed in seeing its line spectrum through the spectroscope.)
 
  • #10
201
25
i searced online and , i saw that video on youtube :


i was wondering is that green glow really indicates that xrays is being produced ?!
becouse in my apparatus i think it might be the same glow , i tried to hold a neon indicator close to the bulb
the neon indicator was flashing 20cm away from the bulb ?!
and why xrays would produce such a glow ?!!
 
  • #11
10
12
i searced online and , i saw that video on youtube :


i was wondering is that green glow really indicates that xrays is being produced ?!
becouse in my apparatus i think it might be the same glow , i tried to hold a neon indicator close to the bulb
the neon indicator was flashing 20cm away from the bulb ?!
and why xrays would produce such a glow ?!!

I don't think you have x-rays being produced in your light bulb. It is unlikely that the gas pressure is low enough - 10-3 to 10-4 Torr is required for soft x-rays and your bulb is likely to have a gas fill at about 80% of atmospheric pressure. You can certainly get x-rays emitted from a television tube if your anode voltage is high enough, probably 30 kV or so would do it. Have a look at this link for more info

http://www.belljar.net/xray.htm

Regarding krypton filled bulbs, I believe the switch to krypton was to allow a higher filament temperature and hence greater luminous efficacy than could be achieved with argon or a vacuum.
 

Related Threads on Is this just a normal fluorescence of glass molecules?

Replies
9
Views
3K
  • Last Post
Replies
2
Views
1K
Replies
15
Views
2K
Replies
4
Views
665
  • Last Post
Replies
3
Views
2K
Replies
3
Views
2K
Replies
1
Views
2K
Replies
5
Views
2K
  • Last Post
Replies
3
Views
2K
G
Replies
33
Views
2K
Top