Monitored using Geodetic Grids of length measurement interferometers Approx 800 Grid Line Interferometers.

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Monitored using Geodetic Grids of length measurement interferometers Approx 800 Grid Line Interferometers

Interferometer design means returns Are only -70 dB to -90 dB!

Phase unwrapping

To measure GLI phase shift… (Reference phase)

Minimise Fit Quality Search For minima using MINUIT

Think modulo 2 

Signal degrading effects in ATLAS Low signals – 800 hungry interferometers to be fed Potential for reflections off many surfaces inside ATLAS Potential for mechanical vibrations (& turbulence)

Low signal power

Low signal power reduces depth of minimum in fit quality

In the presence of spurious reflections… …other minima appear

Measurement precision unaffected by spurious reflections 4 spurious Reflectors added

Vibration

More vibration….. Fit collapses!!

To Stop the Fit Collapsing Redefine the WEIGHT in the fit quality to penalise decrease in fringe amplitude New WEIGHT = Fringe amplitude 1/2

Is there a problem at 400 nm = 0.5 ? or was it just because two subscans are not enough? Increase peak to peak vibration amplitude to 1.8  m (>2 )and use 6 subscans At 70 Hz

Looks very promising…

CONCLUSIONS Initial investigations into the effects of low SNR, spurious reflections and vibrations show that… …FSI is a robust technique for precise distance measurements. Further work needed to improve linking and investigate data analysis alternatives and their potential benefits, eg FFT.