[time-nuts] How good is your ADEV at 10E7 seconds? :)

Magnus Danielson magnus at rubidium.dyndns.org
Sat Nov 18 06:30:50 EST 2017

On 11/18/2017 12:16 PM, Attila Kinali wrote:
> On Fri, 17 Nov 2017 17:54:51 -0800
> Hal Murray <hmurray at megapathdsl.net> wrote:
>> LIGO only works for roughly the audio spectrum.  At the low and high ends,
>> the noise goes up.  Lots of people are working on how to build gear that will
>> work at other wavelengths.
> I was wondering about those limits, when i saw the plots.
> Though, is it really the time/frequency source that defines
> the detection limit?

If your laser bounces 100000 times in a 4 km tunnel to detect things, 
speed of light will limit the effective bandwidth.

Thermal noise plucking the silica fibre suspension creates a noise floor.

There is no cesium or H-maser at LIGO, they use GPS, we sure asked.


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