For the last few months I have been working on a vertical seismometer. =
Work
to date has been mostly with the measurement of N/A or newtons per amp
calibration factor for 3 different geometry versions. Results will be
reported in the next several days. Last week I started to cut metal and =
put
together the concept for my vertical. See
http://gelindgren.googlepages.com/gel_vert_11_16_08.jpg  The jar of =
honey
supports the vertical spring. The most interesting part is the bearing
support. See
http://gelindgren.googlepages.com/gel_vert_bearings_11_16_08.jpg  The =
black
ball bearings are made of silicon carbide and =BC=94 in diameter. The =
balls are
epoxied into a partially drilled hole in the aluminum cross bar. The =
balls
ride in two sets of two  1/8=94 diameter rods made from tungsten carbide =
and
will be polished to a mirror finish. As configured the resonant period =
is
very short, maybe =BD second. Is there an equation that defines a =
vertical
seismometer resonant period. I assume the spring constant is part of the
calculation. Is there a recommended source of compression springs with
various constants. Comments are most welcome. BTW, the jar of honey will =
be
replaced by a 4x4 lab jack.

=20

Gary

=20

=20

=20

=20

=20

=20

=20

Gary Lindgren

585 Lincoln Ave

Palo Alto CA 94301

=20

650-326-0655

=20

  =
www.blue-eagle-technologies.com
Check out Lastest Seismometer Reading

  cymonsplace.blogspot.com=20

=20

=20














For the last few months I have been working on a =
vertical
seismometer. Work to date has been mostly with the measurement of N/A or
newtons per amp calibration factor for 3 different geometry versions. =
Results
will be reported in the next several days. Last week I started to cut =
metal and
put together the concept for my vertical. See http://g=
elindgren.googlepages.com/gel_vert_11_16_08.jpg=A0
The jar of honey supports the vertical spring. The most interesting part =
is the
bearing support. See http://gelindgren.googlepages.com/gel_vert_bearings_11_16_08.jpg=A0
The black ball bearings are made of silicon carbide and =BC” in =
diameter. The
balls are epoxied into a partially drilled hole in the aluminum cross =
bar. The
balls ride in two sets of two=A0 1/8” diameter rods made from =
tungsten
carbide and will be polished to a mirror finish. As configured the =
resonant
period is very short, maybe =BD second. Is there an equation that =
defines a
vertical seismometer resonant period. I assume the spring constant is =
part of
the calculation. Is there a recommended source of compression springs =
with
various constants. Comments are most welcome. BTW, the jar of honey will =
be
replaced by a 4x4 lab jack.

 

Gary

 

 

 

 

 

 

 

Gary Lindgren

585 Lincoln Ave

Palo Alto CA 94301

 

650-326-0655<=
/span>

 

www.blue-eagle-technologies.com=A0=A0
Check out Lastest Seismometer =
Reading

cymonsplace.blogspot.com