PSN-L Email List Message

Subject: Re: Measuring Time Delay
From: ChrisAtUpw@.......
Date: Mon, 10 Jan 2000 14:59:57 EST

>> Any pulse you record by droping water or beads records too much of the 
environment around the geophone.

    Are you saying that a hydraulic shaker table can't be used to determine 
the overall response of a geophone?

    I wasn't proposing to drop water or beads. Injecting one ml of water into 
a li-lo cushion would move a geophone placed on top upwards by about 10 
microns. It can easily be made a lot less.  


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Larry Cochrane <cochrane@..............>