[time-nuts] CCD lock detection (was: DIY Physics Article)

[Tom Knox]

I was thinking you could view it through fiber

Thomas Knox



> Date: Wed, 22 Feb 2012 19:19:57 +0100
> From: attila at kinali.ch
> To: time-nuts at febo.com
> Subject: [time-nuts] CCD lock detection (was: DIY Physics Article)
> 
> On Wed, 22 Feb 2012 09:14:34 -0700
> Tom Knox <actast at hotmail.com> wrote:
> 
> > Rather then a simple lock LED I think what would be interesting if possible
> > to place a CCD next to a Rubidium or Cesium cell to  view the luminance at
> > the hyperfine transiton. I am sure someone has done this but I have not
> > seen it.
> 
> I dont think this is easily possible. You have the CCD operating in a strong
> electromagnetic field which will disturb it quite a bit. Though i think
> one could try to use one of the modern CCD like the OVM7690 (a tiny little
> thing of just 2.5x2.5x2.9mm^3 and quite cheap too!) and mount it in some
> empty corner that has little to no field.
> 
> The other problem would be to see the luminance trough the strong
> background. IIRC the "modulation" strength of the absortion is 1-2%
> of the singal. So the luminance would be quite weak behind some strong
> background light as well.
> 
> But it would be nevertheless a cool project :-)
> 
> 			Attila Kinali
> 
> -- 
> Why does it take years to find the answers to
> the questions one should have asked long ago?
> 
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