My first thought after looking at all the messages =
from my request
for input on vertical seismometers was to go with a mechanical concept =
as
pictured http://physics.mercer=
..edu/hpage/new-z.html
and then go with a Chapman magnet and coil for the pickup. But after =
reading
more about the Force Feedback and the Fully-differential =
capacitive-array
displacement sensor, I think I have changed my mind. I would like to end =
up
with the Force-feedback design. I can see 6 months to a year of =
experiments to
get everything going right. I have one question, if I have 8 to 10 Kg of =
mass
on the pendulum, I would think I’m going to need quite a =
amplifier-driver
to keep the pendulum stationery during events. There is also the =
“soft”
force feedback method that allows a little movement of the pendulum. =
What
are your thoughts for all those that are using the force-feedback =
method.
Gary
Gary Lindgren
585 Lincoln Ave
Palo Alto CA 94301
650-326-0655<=
/span>
www.blue-eagle-technologies.com
cymonsplace.blogspot.com