Hi all

Here is a signal that I did get tonight with a 12 second period lehman
type sensor. I have changed the setup a bit from previus setup, this
appears to give me a clear signal. The magnets are now aligned with the
coil, so the magnetic field is now stable when the coil moves. That way
I got rid of increse, decrese effect of the magent in regards to the
coil. The setup is not complete, as I need correct magnets. But I have
setup a test magnets for the time being. The first resaults are good.
The sensor has a high peak around 12 seconds, but is able to detect
signal up to 0.1Hz, as can been seen on this earthquake detection. It
goes as low as 20 seconds I think.=20

This is work in progress, I am going to get rare-earth magnets next
month to make the final improvement to my lehman seismomter.

Here is the signal. This earthquake was Mw4,92 in size at the distance
of 180 km.
http://seismicnet.com/cgi-dos/makegif.exe?/quakes/0905/090529.213318.hvtlhn=
..psn

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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