PSN-L Email List Message

Subject: Re: Frequencies
From: "Geoff" gmvoeth@...........
Date: Sat, 10 May 2008 17:18:06 -0700

Periods shorter meaning a higher freq should be ok
with a 10 sec sensor or so I
understand since the mass is at rest
for freqs above resonance.
The mass moves below resonance and thats why
you loose sensitivity. Or so i understand.

----- Original Message ----- 
To: "psn" 
Sent: Saturday, May 10, 2008 3:07 PM
Subject: Frequencies

Hi Folks,  With some help from many of you, I understand how one loses the signals LONGER than your sensor natural period.  ie  If 
you sensors period is 10 seconds it will lose  (attenuate) the longer frequencies at a rate of 12 decibels per octave.   I think I 
understand that part.

But want about the opposite, say the sensors is 10 second, how does it lose or does it lose shorter frequencies, like 2, 4 or 6 
seconds waves?

My new Lehman is set at 20 seconds, will it pick up 1, 2, and 3 seconds waves?

Thanks, Ted 


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