Hello Bryan,
Can you show us 24 hours of data. Do the seismometer =
support
posts go directly to the garage floor or are they on the =
insulating mat. You
can make small holes in the mat for the support posts if you have not =
done that
already. Your seismometer looks good so far. Good =
work.
Gary
From:=
psnlist-request@.............. [mailto:psnlist-request@............... =
On
Behalf Of Bryan Goss
Sent: Saturday, November 13, 2010 11:53 PM
To: psnlist@..............
Subject: lehman seismometer
I
have built a new lehman seismometer and I have a few questions its been =
several
years since my last one and I have forgotten a lot.
A. I have a small outdoor building not temperature controlled thats why =
I built
the wooden box with insulation.
I am getting noise starting about 1:00am to about 9:00am
should I build an outer box made of foam board and heat it with a =
heating pad
or something to control the temperature.
link to the box and noise
http://www.1goss.com/s-box.jpg
noise example, I had it most of the afternoon although normally during =
the day
it looks like it should.
http://www.1goss.com/noise.jpg
B. The first sensor I built several years back I donated to the local
elementary school when were moving.
It used the razor blade knife edge and steel all thread for the boom and =
did
not have the small aluminum rod I put in the new one.
It worked well but I wanted to build a better one this time round so I =
used a
ball bearing for the pivot point, added
the aluminum rod to help with vertical stabilization and used square =
hollow
tubing for the boom.
Do you see anything wrong with this setup? I want criticism / =
suggestions if
you have any.
http://www.1goss.com/s-bearing.jpg
http://www.1goss.com/s-top.jpg
http://www.1goss.com/s-overall.jpg
http://www.1goss.com/s-boom.jpg
http://www.1goss.com/s-housing.jpg
I had a bit of trouble getting the 25sec period and am not sure it =
is
correct and haven't had a recordable local or teleseismic event to =
compare with
the local
Helicorder Displays.
C. Would a ball bearing at the top and all aluminum preform better than =
a wire?
and if I use all wire what is the very best?
Thanks for your time Bryan S Goss
=