[time-nuts] time-nuts Digest, Vol 53, Issue 47

[Mark Sims]

Ooooh,  way to big, complicated, expensive, fragile, and swoopty fancy pants for real world use...

The CG-3 type instruments and some of the the LaCoste & Romberg units also have ppb resolution and weigh around 12 kg.  The Worden units weigh even less (and I bought mine for less than $100).  The only problem with the Worden type devices is if you even think about jiggling it while the mechanism is unlocked you break the quartz fiber.

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The current method is to drop an optical corner cube (retro-reflector) in a 
vacuum and using a laser measure the distance it moves (which requires a 
reasonably good source of time.
http://www.ngs.noaa.gov/GRD/GRAVITY/ABSG.html


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