PSN-L Email List Message

Subject: RE: geophone too close ?
From: "Bob Hancock" carpediem1@.........
Date: Mon, 30 Apr 2007 09:00:31 -0700

Jon -

One important question you need to answer is what the source of your =
is.  Setting the instrument inside a residence means that your =
will be affected by residence itself.  As pointed out in a previous =
one way would be to separate the base that the geophone resides on from =
base of the residence.  This may not prove to be practical, and winds or
people walking about a residence will affect an instrument.

Another consideration is shielding the instrument itself.  Ambient wind
currents and temperature changes can affect an instrument and bring =
significant variations.  If you could cover the instrument with a bucket
lined in fiberglass or something similar to shield it from these =
changes, it
could reduce your ambient noise. =20

Avoid using foams or Styrofoam as they have minute air pockets in them =
as pressure changes, they will expand or contract and these changes will =
transmitted to the instrument.

Bob Hancock
Three Points, AZ

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
Behalf Of J=F3n Fr=EDmann
Sent: Monday, April 30, 2007 04:19
To: psn-l@..............
Subject: Re: geophone too close ?


After a few hours of testing. I found out that the geophone was too
close. So I put it at more distance this time from the window and the
door. In a part of my apartment where there is little traffic. It is
also the place where I plan to setup the Lehman type sensor I plan to
build next month.

J=F3n Fr=EDmann


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