PSN-L Email List Message
Subject: My horizontal sensor
From: Bobhelenmcclure@.......
Date: Sun, 10 Nov 2002 11:47:49 EST
Hi all,
I am presently using a pre-Lehman type sensor I built more than 44 years
ago, after reading an Amateur Scientist article. At that time, it was
equipped with optical means for sensing pendulum displacement. I recently
retrieved the sensor from storage, and modified it for velocity sensing. It
really works well. It is set for 11 seconds natural period, and I
post-filter the data to simulate a natural period of 32 seconds. My ability
to pick up teleseisms is limited only by local noise and microseisms.
The pendulum, magnet and coil design are unusual. You can see it described
at John Lahr's web page:
http://www.jjlahr.com/science/psn/mcclure/index.html
Regards,
Bob McClure
Hi all,
I am presently using a pre-Lehman type sensor I built more than 44 years ago, after reading an Amateur Scientist article. At that time, it was equipped with optical means for sensing pendulum displacement. I recently retrieved the sensor from storage, and modified it for velocity sensing. It really works well. It is set for 11 seconds natural period, and I post-filter the data to simulate a natural period of 32 seconds. My ability to pick up teleseisms is limited only by local noise and microseisms.
The pendulum, magnet and coil design are unusual. You can see it described at John Lahr's web page:
http://www.jjlahr.com/science/psn/mcclure/index.html
Regards,
Bob McClure
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