PSN-L Email List Message
Subject: Re: Channel, 1,2 and 3?
From: Brett Nordgren Brett3mr@.............
Date: Sun, 23 Mar 2008 10:50:13 -0400
One more thought. Your observations triggered an idea that might prove
useful for reducing the local noise sensitivity of a vertical pendulum
sensor, i.e. one having a horizontal hinge axis.
If you construct a Nearly Balanced sensor or similar device which is mainly
sensitive to tilt or rotation, and then if you used identical transducers
on it and on the regular pendulum so that the sensitivity per degree of
tilt was identical, and finally oriented them in the same direction, you
could subtract the data from the nearly-balanced one from the regular
pendulum to leave the seismic translation data, but remove the tilt noise,
which I think may be mostly of higher frequency, and local in origin.
That might considerably reduce the noise level of the pendulum seismic
data. Of course that also eliminates the super low frequency tilt motions,
like earth tides, etc. if that's what you were wanting to see.
BTW, in my previous post, at the beginning I think I interchanged E/W and
N/S. Hope that didn't confuse things too badly.
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