This is another project which used the Torsion wire/spring/fiber =
approach to produce a short period sensor.   Similar, in concept to the =
Wood Anderson Torsion spring.


http://tinkeringcaveman.googlepages.com/home


I made a version, of this approach, it which is about 24" tall x 10"x10" =
using a square solid box made of 3/4" melamine material use for cabinet =
construction.   The reason I used this material was that I had it on =
hand, and I just wanted to test the idea.   The material worked out =
fine, and for that matter so did the sensor.   I suspended a thin ss =
wire, about 20" long, to the top and bottom of the box, , attached a =
magnet and coil assembly, onto a 12" horz arm.   This acts like a horz =
pendulum on one side of the wire.    More information avail to anyone =
interested in this, just email me.



 My system has a 6.5 second period.   It records earthquakes as well as =
any of my other sensors.
 I moved recently and found this sensor to be the easiest to move, set =
up and level.  No ball on plate or other balancing issues.   I just =
removed the coil, moved the 12" arm to the side of the box, and secured =
it.
 The torsion spring is connect to the top and the bottom of the box, so =
it did not need to be disconnected.
 I plan to build another, this time a bit different.

Thought you might like to see this.

Thanks,
Ted







 
 
This is another project which used the =
Torsion=20
wire/spring/fiber approach to produce a short period sensor.   =

Similar, in concept to the Wood Anderson Torsion spring.
 
 
http://tinkeringcav=
eman.googlepages.com/home
 
 
I made a version, of this =
approach, it which=20
is about 24" tall x 10"x10" using a square solid box made of 3/4" =
melamine=20
material use for cabinet construction.   The reason I used =
this=20
material was that I had it on hand, and I just wanted to test the=20
idea.   The material worked out fine, and for that matter so =
did the=20
sensor.   I suspended a thin ss wire, about 20" long, to =
the top=20
and bottom of the box, , attached a magnet and coil assembly, onto =
a 12"=20
horz arm.   This acts like a horz pendulum on one side of the=20
wire.    More information avail to anyone interested in =
this,=20
just email me.
 
 
 
 My system has a 6.5 second=20
period.   It records earthquakes as well as any of my other=20
sensors.
 I moved recently and found this =
sensor to be=20
the easiest to move, set up and level.  No ball on plate or other =
balancing=20
issues.   I just removed the coil, moved the 12" arm to the =
side of=20
the box, and secured it.
 The torsion spring is connect to =
the top and=20
the bottom of the box, so it did not need to be =
disconnected.
 I plan to build =
another, this time a bit=20
different.
 
Thought you might like to see =
this.
 
Thanks,
Ted