PSN-L Email List Message

Subject: Re: Orthogonal seismometer
From: sismos sismos@..............
Date: Sun, 21 Feb 2010 22:09:04 +0000

Hi Martin,

Please do post some pictures and an article!! 



On Sun, 2010-02-21 at 12:29 -0500, Tangazazen@....... wrote:
> Hi All,
>     It seems to have gone rather quiet on the subject of seismometers
> lately. 
> I was wonder if there is any interest in a orthogonal pendulum
> broadband version which  has been in operation for 3 years without
> problems.
>  It consists of a short pendulum with a natural period of 1 second and
> supported by 4 leaf springs such that it has two degrees of freedom.
> The electronics gives the pendulum a period of 50 seconds and uses an
> LED attached to projects a spot of light onto a quadrant photo
> detector thus resolving an X and Y components.
> Orthogonal electromagnetic transducers hold the pendulum in a fixed
> position as in the broadband configuration. Examination of the P wave
> on an x-y plot gives a line of travel of the disturbance.
> If there is any interest I do have some photographs and a rough write
> up.  I am not a computer publishing expert,so rough is the operative
> word.
> Martin Page  


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