PSN-L Email List Message

Subject: Re: Very Simple Sensor
From: "Geoff" gmvoeth@...........
Date: Sun, 11 Sep 2005 11:10:19 -0700

The sensor really must be isolated from
structures or foundations of structures
you need to be on or under the ground
away from trees and buildings and other things
which are affected by wind or foot or other traffic.
If you can get isolated just 15 linear feet away onto
bare ground that is better
then simply moving from one building to another.
Bedrock is probably the single best thing you could find.
'Chuckle' Bedrock reminds me of Fred Flinstone.
The code phrase for today is 'Quiet Bedrock'.
My Air conditioner unit is vibrationally coupled to
the slab upon which my home resides so there is no
quiet place I can put my geophone within 20 feet
of the electronics.
Awnings and mobile homes couple wind noise to the slab.
If I had known what I know now I would have built a
special isolated Vault just for the geophone
away from Water pipes with their water hammer
and electrical entrance with the 60Hz noise.


> I'm now confident that it works.  Background noise is the biggest 
> problem that I see at this time, and that may be due to the poor 
> location of the sensor on a table on the third floor of the town 
> house where I'm currently living.  I'll be moving to a house soon, 
> and will see how it works in a quieter location.

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