PSN-L Email List Message
Subject: lehman seismometer
From: Bryan Goss bryangoss@........
Date: Sun, 14 Nov 2010 01:52:47 -0600
I have built a new lehman seismometer and I have a few questions its been s=
everal years since my last one and I have forgotten a lot.
A. I have a small outdoor building not temperature controlled thats why I b=
uilt the wooden box with insulation.
I am getting noise starting about 1:00am to about 9:00am=20
should I build an outer box made of foam board and heat it with a heating p=
ad or something to control the temperature.
link to the box and noise
http://www.1goss.com/s-box.jpg =20
noise example=2C I had it most of the afternoon although normally during th=
e 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 eleme=
ntary school when were moving.
It used the razor blade knife edge and steel all thread for the boom and di=
d 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=2C added=20
the aluminum rod to help with vertical stabilization and used square hollo=
w tubing for the boom.
Do you see anything wrong with this setup? I want criticism / suggestions i=
f 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 corr=
ect and haven't had a recordable local or teleseismic event to compare with=
the local=20
Helicorder Displays.
C. Would a ball bearing at the top and all aluminum preform better than a w=
ire? and if I use all wire what is the very best?
Thanks for your time Bryan S Goss
=
I have built a new lehman seismometer and I have a few questions its been s=
everal 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 =3B
noise example=
=2C I had it most of the afternoon although normally during the day it look=
s like it should.
http://www.1goss.com/noise.jpg
B. The first sen=
sor I built several years back I donated to the local elementary school whe=
n were moving.
It used the razor blade knife edge and steel all thread f=
or 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 us=
ed a ball bearing for the pivot point=2C added
the aluminum rod to hel=
p 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.
ht=
tp://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
=3BI had a bit of trouble getting the 2=
5sec period and am not sure it is correct and haven't had a recordable loca=
l or teleseismic event to compare with the local
Helicorder Displays.
C. Would a ball bearing at the top and all aluminum preform better th=
an a wire? and if =3B I use all wire what is the very best?
Than=
ks for your time Bryan S Goss
=
=
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