Talk:Caesium standard

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Talk

Re; Using Caesium 133 as the standard second.

I appreciate this is the most accurate way to get close to an actual solar second of earthcentric time, But why don't we use Hydrogen (tritium isotope) as a way to have a common standard time second with the complete universe.

If we did how many Ceasium 133 Seconds would there be in a Tritium Second?

Thanks. Bill in Toronto

Caesium-133 is a stable isotope. Tritium has a half-life of about 12 years, meaning that every 12 years, you'll have to replace half of it. And it's horribly expensive.

I'm also confused about your "actual solar second of earthcentric time". The second under SI is a simple measurement of experienced time, defined using Caesium-133. As for a "standard time second with the complete universe", there is none, the passage of time is completely dependent on your local reference frame. Ask Einstein.

Underjack 02:39, 27 September 2007 (UTC)[reply]

Short and long term stability

It could be useful to say what short and long-term frequency stability caesium clocks can achieve. - Rod57 (talk) 15:57, 17 October 2011 (UTC)[reply]

And maybe to mention more stable clocks that have been developed since 1960. - Rod57 (talk) 15:57, 17 October 2011 (UTC)[reply]

which Cs clock implementation was actually the first?

I was working on my PhD thesis and found this page usefull as a start, but it could be incorrect in it's claim of the NPL Cs standard being the first working standard. I have the following referenceCite error: The <ref> tag name cannot be a simple integer (see the help page). making note of a NBS Cs standard working before the NPL one.

Move article to Caesium atomic clock?

I think "Caesium atomic clock" is the most WP:COMMONNAME of this device. In addition the existing name Caesium standard is confusing because it is also used for chemical purity standard samples of caesium metal. Chetvorno^TALK 11:54, 13 March 2016 (UTC)[reply]

I am going to make the move within a week unless some persuasive reason not to appears. --Chetvorno^TALK 13:16, 8 February 2017 (UTC)[reply]

So how does it work?

Lots of fine words about energy levels and other secondary school level physics, but nothing here or anywhere on how a Caesium clock actually measures time? How do we detect these vibrations and how do we count them? And how is that information used to generate a time signal precise enough to reflect the underlying accuracy and be of practical use.Stub Mandrel (talk) 18:46, 25 August 2020 (UTC)[reply]

Cesium standard of time measuring when Cs atoms are frozen to almost 0 Kelvin?

Time measuring 78.154.13.189 (talk) 21:13, 17 April 2022 (UTC)[reply]

"the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency"

What in the world does that mean? I thought Wikipedia was supposed to be understandable Azbookmobile (talk) 16:46, 22 November 2022 (UTC)[reply]

fix intro grammar: "UK."

intro currently says:

"The first caesium clock was built by Louis Essen in 1955 at the National Physical Laboratory in the UK. and promoted worldwide by Gernot M. R. Winkler of the United States Naval Observatory."

The period after "UK" is very confusing to me. Normally if periods are used to notate a multi-word abbreviation, then every letter would get a dot: (e.g. U.S.A. or U.K.). Because the intro just uses one dot my brain tries to parse the period as indicating the sentence ends after "UK", but I see after it a lowercase "and", so then my brain is confused. So please either write it as "United Kingdom" or "U.K." or "UK" but not as "UK."

I'm also having trouble interpreting that second half of that line; is the thing being promoted the first caesium clock design, or is it the use of caesium clocks in general, or is it the Caesium standard (the title of the article). So maybe two separate sentences where the second sentence has a clearer subject would be more understandable. Em3rgent0rdr (talk) 23:08, 3 May 2024 (UTC)[reply]

Constant temperature units

Causuim units 41.122.11.173 (talk) 08:21, 8 September 2024 (UTC)[reply]