I have seen a few descriptions of the "Folded Pendulum" sensor concept.  =
Here is one http://jclahr.com/science/psn/youden/  from this one and =
others I get the general idea.

I made a mock up using two pendulums 16" long and a cross member of =
about 15"  By moving the mass L and R on the cross member beam, I could =
get up to 12 seconds period.

I guess the longer the pendulums the longer the period, so If I use 24" =
It could be more than 12 secs.  This design by David H. Youden, uses =
6.47" pendulums, and I did not see what period it produced.  The overall =
dim of it, is 10.27" tall....So perhaps it has a shorter period.

Have any of you built or tried this approach?

Thanks, Ted








I have seen a few descriptions of the =
"Folded=20
Pendulum" sensor concept.  Here is one http://jclahr.com/science/=
psn/youden/ =20
from this one and others I get the general idea.
 
I made a mock up using two pendulums =
16" long and a=20
cross member of about 15"  By moving the mass L and R on the cross =
member=20
beam, I could get up to 12 seconds period.
 
I guess the longer the pendulums the =
longer the=20
period, so If I use 24" It could be more than 12 secs.  This design =
by=20
David H. Youden, uses 6.47" pendulums, and I did not see what period it=20
produced.  The overall dim of it, is 10.27" tall....So perhaps it =
has a=20
shorter period.
 
Have any of you built or tried this=20
approach?
 
Thanks, Ted