PSN-L Email List Message
Subject: Re: Homade Geophone
From: "Geoff" gmvoeth@...........
Date: Fri, 5 Aug 2005 20:25:22 -0700
1. It seems to me that a cylindrical magnet inserted into the center a coil
dangling freely might be the best way to go
but it needs to be a very powerful magnet and have no more
then 1mm of slop in any direction. The question is what dampening device to use is best
I have found silicon oil of about 50WT should do nicely
but trying to get your hands on silicon oil is like impossible
in small quantities.
2. I have found most noise sources do not look anything like a seismic signal
if the noise is infrequent you can filter out such things
with your own human judgment.
This is saying though that people are not out there
intentionally trying to induce an EQ signal using noise
into your particular system.
3. I am interested in knowing the cheapest way possible to
build your own Geophone that consistently receives
teleseismic signals over a long period of time
The Geophone companies want like $3000 for a single
vertical 1Hz Geophone...surely us amateurs can build a simple one
for a Lab setting < opposed to a field setting > for
much less like $20.
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