PSN-L Email List Message

Subject: Re: My lehman type sensor is ready
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Sat, 10 May 2008 00:11:47 +0000

Hi all

The lehman type sensor is up and running. However I have found one bad
bug in it. Where the arm as attached to the arm where the mass is. I
need to make it shorter (I think, at least so I can get it to hold the
mass up properly) and attach it to the mass arm it self to hold it up.
But the current attachment can't hold up the mass, that did destory the
hoding inside of it.

The second issue that I might have is that I am not sure if the damping
is correct or not.

Using Winquake FFT feature it appears that the seismomter has a natrual
frequancy of around 1Hz but it goes down to 10 seconds. This is a second
bug that I also need to fix somehow. As I am looking for up to 30 second

I hope to fix the first bug on monday, I might also do some other
modifactions to the sensor to make it more sensitive.

J=F3n Fr=EDmann


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