Hi all,
I suggest a different approach for homemade vertical sensors.
The sensor in the link you propose is VERY sensitive to axial movements
(horizontal movements)
if you give a look to=20
http://www.infoeq.it/doc02v_e.htm
and scroll the page until you reach:
Lacoste suspension sensor=20
you can see a good approach to a sensitive=20
long period seismometer.
There are also sofisticated tecniques to=20
have a virtually infinite response for that kind
of seismometer using a "zero length spring".
Mr Lacoste writed a lot of paper on it.
Chris Chapman is better documented on this point.
I hope to have the time to publish an abstract on these tecnmiques
but any clever mind can understand how the Lacoste suspension
is great and simple to build.
Regards
Mauro
----- Original Message -----=20
From: John & Jan Lahr=20
To: psn-l@.................
Sent: Monday, December 30, 2002 6:47 PM
Subject: Re: Notes to UK--Nick
I've scanned Jim's Short Period design plans and put a copy on my web =
site here:
http://jjlahr.com/science/psn/lehman/
This will save on postage and make the plans available to more people. =
They
are a good example of how to document a seismic sensor design.
Happy New Year,
John
At 12:15 PM 12/28/2002, you wrote:
Nick--I do not need an e-mail address. I only needed your mailing =
address to send the "Short Period" design plans.
The plans were mailed airmail to U.K. 2 days before Christmas.
A good New Year to you and all the PSN group.
J. Lehman.
Hi all,
I suggest a different approach for =
homemade=20
vertical sensors.
The sensor in the link you propose is =
VERY=20
sensitive to axial movements
(horizontal movements)
if you give a look =
to=20
http://www.infoeq.it/doc02v_e.=
htm
and scroll the page until you =
reach:
Lacoste suspension =
sensor=20
you can see a good approach to a =
sensitive=20
long period seismometer.
There are also sofisticated tecniques =
to=20
have a virtually infinite response =
for that=20
kind
of seismometer using a "zero length=20
spring".
Mr Lacoste writed a lot of paper on=20
it.
Chris Chapman is better documented on =
this=20
point.
I hope to have the time to publish an =
abstract on=20
these tecnmiques
but any clever mind can understand =
how the=20
Lacoste suspension
is great and simple to =
build.
Regards
Mauro
----- Original Message -----
From:=20
John =
& Jan=20
Lahr
Sent: Monday, December 30, 2002 =
6:47=20
PM
Subject: Re: Notes to =
UK--Nick
I've scanned Jim's Short Period design plans and put a =
copy on=20
my web site here:
http://jjlahr.com/science/psn/lehman/
This =
will save=20
on postage and make the plans available to more people. =
They
are a=20
good example of how to document a seismic sensor design.
Happy =
New=20
Year,
John
At 12:15 PM 12/28/2002, you wrote:
Nick--I do not need=20
an e-mail address. I only needed your mailing address to send =
the=20
"Short Period" design plans.
=
The plans=20
were mailed airmail to U.K. 2 days before =
Christmas.
A good New Year to you and all the PSN=20
group.
&nbs=
p; =
; =20
J. Lehman.