[time-nuts] Surplus Guidelines, was: Rubidium Standard

Jack Hudler jack at hudler.org
Sun Dec 10 15:04:32 EST 2006

What is the blacken from, the rubidium itself?
Hmmm I wonder if a high power laser can liberate enough to make one useable
again? I have about 100000 shots left on a 6 megawatt laser.


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Of Poul-Henning Kamp
Sent: Sunday, December 10, 2006 1:43 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Surplus Guidelines, was: Rubidium Standard

In message <457C6134.4030606 at pacific.net>, Brooke Clarke writes:

>I think there are two things that go wrong with Rubidium standards. 
>1.    The Rubidium in either the lamp or the absorption cell (I forget 
>which) gets used up [...]

That's not quite correct.  The normal "old age" failure mode is
that the glass bulb absorbs rubidium and becomes so blackend that
the light doesn't shine through any more.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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