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Neon lamp

Neon lamp

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This old Neon lamp is being stimulated with a microwave source during an experiment. The wave-guide can be seen on the left. Energy absorbing arresters devices using neon can be found in Radar aerial to prevent initially transmitted microwaves hitting the receiver circuits in the wave-guides.

This experiment was for a submission for this year’s “Flashing Light” competition : https://youtu.be/XiAExNZWYD0

xenon_thyratron.jpg neon_RF.jpg laser_on.jpg co2_laser_a.jpg

Light Information

Light Information

Manufacturer:Osram
Lamp
Base:BC
Electrical
Voltage:240

File information

File information

Download: Download this File
Filename:neon_RF.jpg
Album name:tuopeek / misc
Keywords:Miscellaneous
File Size:72 KB
Date added:Feb 11, 2018
Dimensions:1000 x 988 pixels
Displayed:100 times
Date Time:2018:02:11 15:22:28
DateTime Original:2018:02:10 18:21:47
Exposure Bias:0 EV
Exposure Time:1/125 sec
FNumber:f 4.8
Flash:No Flash
Focal length:40 mm
ISO:5000
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=-142658
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Lodge
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Feb 11, 2018 at 12:36 PM Author: Lodge
Well I have to say that is a pretty unique way to make a flashing neon..
Max.
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Feb 11, 2018 at 02:00 PM Author: Max.
Impressive set-up and very creative work there, I like it! Be careful not to expose yourself to microwave energy though, you don't want to end up with a brain tumor.
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Robert


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Feb 11, 2018 at 04:31 PM Author: rjluna2
How much power did you attempted to emit microwave radiation?

Pretty, please no more Chinese failure.

tuopeek
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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Feb 11, 2018 at 05:12 PM Author: tuopeek
Thanks all. The output energy is as low as the magnetron would operate. I reckon its producing a maximum of about 20W. Don't think it has been running for even 10 minutes all in. Just long enough to set it up and make a video of it. Max, don't think there is any big risk with this level of energy. It will interfere with electronic devices placed close, as I discovered when I got my camera too close to the wave guide. They do say, never look into a wave guide. Eyes are easily damaged if there is a heating effect. My camera stopped recording with the error "lens missing", but recovered when power cycled.
Lodge
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Feb 11, 2018 at 07:03 PM Author: Lodge
What frequency are you operating this at ? 2.45 GHz
rjluna2
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Feb 12, 2018 at 06:23 AM Author: rjluna2
Thanks, Mark

Pretty, please no more Chinese failure.

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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Feb 12, 2018 at 11:58 AM Author: tuopeek

What frequency are you operating this at ? 2.45 GHz

Yup, standard oven frequency. The frequency is related to the geometry of the magnetron anode and magnetic field strength. Adjusting the power doesn't influence the frequency.
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Feb 12, 2018 at 02:48 PM Author: Valve 72
Impressive!
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Feb 13, 2018 at 08:18 PM Author: Globe Collector
How did you get the power level so low?

Just reduce the anode voltage of the magnetron?


Interesting to see how it is partially coupling to the electrode helix inside the lamp. What happens if you orient the lamp differently...like the etch facing the waveguide or side-on with the base of the lamp out horizontally?

Waveguides operate in different "modes" in the different axies and the helical electrodes in the lamp could act at transformer turns if they are so oriented that they couple with one of these modes.

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

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tuopeek 111967450636623837217 tuopeek1 77334065@N05/
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Apr 10, 2018 at 02:46 PM Author: tuopeek
Voltage doubler circuit with a HF inverter supply only capable of about 20W but with a good peek voltage seemed to do the trick. So in theory not reducing the voltage but reducing but the discharge current available at a point in time.

Any gas filled tube placed close would glow in the area closest to the wave guide. Didn't seem particularly affected by the metal internal parts. Perhaps if they were resonant it would be different. haven't played with this since I made it for the Flashing neon competition.



How did you get the power level so low?

Just reduce the anode voltage of the magnetron?


Interesting to see how it is partially coupling to the electrode helix inside the lamp. What happens if you orient the lamp differently...like the etch facing the waveguide or side-on with the base of the lamp out horizontally?

Waveguides operate in different "modes" in the different axies and the helical electrodes in the lamp could act at transformer turns if they are so oriented that they couple with one of these modes.
Globe Collector
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Apr 10, 2018 at 07:12 PM Author: Globe Collector
So you effectively raised the source impedance of the power supply...I'll have to give this go myself...just keep my balls and eyes well away...not that I will ever really need the former anymore!

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

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