Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

fluorescent lamp with a (cylindrical) tube with variable length

Status
Not open for further replies.

ghasem_008

Full Member level 4
Joined
Feb 9, 2012
Messages
221
Helped
11
Reputation
22
Reaction score
10
Trophy points
1,298
Activity points
2,990
hi.
is there any fluorescent lamp with a (cylindrical) tube with variable length?
for a specific project,I have to control length of a fluorescent lamp.
is there anyone who can give me a suggestion?
 

What do you mean with variable length?

Fluorescent lamps can be made in arbitrary lenghts and shapes. You need a glassblower to make it.
 

please see the following picture:
Untitled.jpg
in this picture,length "L" is variable and I want to change it when I need to different "L".
in fact my fluorescent lamp is fixed (and attached to AC voltage via electrodes and has step by step tube in "L" section.
can I produce it?
 
I fear the question isn't clear. Are you asking for a flexible glass tube (which doesn't exist, unfortunately) or how to order glas tubes of different length and make fluorescent lamps?

The internal space of a fluorescent is evacuated and filled with low pressure noble gas and mercury vapour, about 0.3% of atmospheric pressure, so any kind of movable seal isn't feasible.
 

You can get vacuum tight bellows, like a corrugated hose. They have a total movement of about 20mm. We tuned klystrons by displacing one end of the bellows which then moved an internal tuner in or out. The vacuum inside the klystron was at a very low presssure. They were about 70mm external diameter. Big but, you need some serious high vacuum technology to install then in series with a glass tube. Ours were mounted on the copper plates (part of the tuning cavities).
Frank
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top