[time-nuts] FRSc RB lamp experiment
paulswedb at gmail.com
Sat Feb 12 23:02:12 UTC 2011
Well indeed Magnus the black stuff and silver blob were rb.
300 degrees F for 15 minutes made it all go away.
I was using a j thermocouple to measure the temp and right at the bulb.
The trick seems to be for a FRS c to get the blob to the lowest point of the
capsule thats observable. I did this with the normal RB power system heated
to 177 degrees. Gently tapped a few times to get it concentrated.
Then powered off and let it cool.
Next step hung the assembly from a lamp so the heat gun could be pointed
straight up to boil the RB off at 300 degrees for 10 minutes and let it go
for 5 more for good luck.
The dark area on the capsule is significantly reduced and no trace of the
During the heating I could actually see the silver blob shrink.
The RB lamp lights well and looks good.
Now to try reassembling everything. That will be a job.
On Sat, Feb 12, 2011 at 5:07 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:
> Dear Paul,
> On 12/02/11 21:34, paul swed wrote:
>> Hello to the group
>> Finally received the heat gun this week and attempted to recover a FRS c
>> In the bad lamp you can actually see a small silver blob and on closer
>> inspection the center of the bulb front has a small circle of something.
>> When heated by the normal oven at 177 degrees F the silver blob will move
>> around. The center dark area does not.
>> I wonder if this dark center is attenuating the Rb light.
> I bet it is a thin layer of Rb... so yes.
> Do not really want to take the temperature higher. Magnus could remove his
>> Rb capsule. The FRS lamp is glued in and I can not get it out.
>> My concern is that the surrounding electronics might literally get fried.
>> (Suppose it doesn't matter)
>> Magnus any idea how hot you may have run your lamp to get the stuff to
>> off and how long at that temperature?
> I did not measure the temperature, but I was able to heat it up fairly
> quickly with my small heat-gun, despite the fact that the removal tool was
> cooling it off... maybe I was heating it for 5 min or so... but I was able
> to have the dark shade evaporating.
> In order to prove there is more light I will need to do a lot of
>> to get the system to the lamp detection stage so I can measure it. The
>> voltage had been 1.83 volts before it simply would not work. So anything
>> above that would make all this worth while.
> It is well worth the effort, but the ability to heat it may vary.
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