PSN-L Email List Message
Subject: Lehman advantages
From: "tchannel" tchannel@..............
Date: Sun, 24 Jun 2007 09:54:20 -0600
Hi Folks, I am thinking about building another Lehman style Horz =
Pendulum sensor. I don't really need to build another,
but I have some construction ideas I wanted to try. Before I start, =
could you describe the benefits of these points.
1 FIRMLY ATTACHED THE SENSOR THE THE EARTH. I wish to make the contact =
between the earth, and the sensor as firm as possible, in this case the =
concrete slab setting on the earth and the sensor. Presently the =
sensor has three feet which just set on the concrete slab. I know some =
people use adhesive to the concrete. If I found a way to bolt all three =
feet into the concrete, and a new way to make the necessary adjustments, =
what benefits would be derived?
I understand that even the concrete floor floats on the earth. I am =
just talking about the benefits of a tighter connection between the =
sensor and the floor.
2 A RIDGED VERTICAL SUPPORT FOR THE UPRIGHT. I know that on a typical =
Lehman the vertical needs to be ridged and minimize the flex between the =
vertical and the horz members. If I found a way to minimize this flex, =
what benefits might I see? The one I have has no flex that I can see, =
but If I added addition braces so the vertical was at 90 to the horz =
with the minimum of flex, What benefit would there be?
3 USING A LONGER ARM. I used a normal length arm, and I understand if =
space was not an issue a very long 100 meters arm would result in a =
longer period. I am just asking if space was avail would a 5 foot arm =
result in any benefits, over a 3 foot arm?
The last question is, if I had a sensor which was firmly attached to the =
floor, with a very ridged vertical, and a longer arm.
(with all the other important factors aside) What kind of improvements =
might I expect? I think I could build a new and improved sensor, =
addressing these three issues. But would these three issues make much =
different. If I would, see improvements would they only be for =
teleseimic events, or would the improvements be evident in recording =
regional as well.
Hi Folks, I am thinking about =
building=20
another Lehman style Horz Pendulum sensor. I don't really need to=20
build another,
but I have some construction ideas I =
wanted to=20
try. Before I start, could you describe the benefits of these=20
points.
1 FIRMLY ATTACHED THE SENSOR THE =
THE=20
EARTH. I wish to make the contact between the earth, and the =
sensor=20
as firm as possible, in this case the concrete slab setting on the =
earth=20
and the sensor. Presently the sensor has three feet which =
just set=20
on the concrete slab. I know some people use adhesive to the =
concrete.=20
If I found a way to bolt all three feet into the concrete, and a =
new way=20
to make the necessary adjustments, what benefits would be =
derived?
I understand that even the concrete =
floor floats on=20
the earth. I am just talking about the benefits of a tighter =
connection=20
between the sensor and the floor.
2 A RIDGED VERTICAL SUPPORT FOR THE =
UPRIGHT. =20
I know that on a typical Lehman the vertical needs to be ridged and =
minimize the=20
flex between the vertical and the horz members. If I found a =
way=20
to minimize this flex, what benefits might I see? The =
one I have=20
has no flex that I can see, but If I added addition braces so the =
vertical was=20
at 90 to the horz with the minimum of flex, What benefit would there=20
be?
3 USING A LONGER ARM. I =
used a normal=20
length arm, and I understand if space was not an issue a very long 100 =
meters=20
arm would result in a longer period. I am just asking if space was =
avail=20
would a 5 foot arm result in any benefits, over a 3 foot =
arm?
The last question is, if I had a sensor =
which was=20
firmly attached to the floor, with a very ridged vertical, and a longer=20
arm.
(with all the other important factors =
aside) What=20
kind of improvements might I expect? I think I could =
build a new=20
and improved sensor, addressing these three issues. But would =
these three=20
issues make much different. If I would, see improvements would =
they only=20
be for teleseimic events, or would the improvements be evident in =
recording=20
regional as well.
Thanks, Ted
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