Sounds very interesting to me. Please include photos and description ! =
Thanh you, hans stauffer
  ----- Original Message -----=20
  From: Tangazazen@..........
  To: psn-l@.................
  Sent: Sunday, February 21, 2010 12:59 PM
  Subject: Orthogonal seismometer=20


  Hi All,

      It seems to have gone rather quiet on the subject of seismometers =
lately.=20
  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.










Sounds very interesting to me. Please include photos and =
description !=20
Thanh you, hans stauffer

  
----- Original Message ----- 
  From:=20
  Tangazazen@....... 
  
To: psn-l@.............. 
  
Sent: Sunday, February 21, 2010 =
12:59=20
  PM
  
Subject: Orthogonal seismometer =

  


  
Hi All,
  
 
  
    It seems to have gone rather quiet on the =
subject of=20
  seismometers lately. 
  
I was wonder if there is any interest in a orthogonal =
pendulum=20
  broadband version which  has been in operation for 3 years =
without=20
  problems.
  
 It consists of a short pendulum with a natural period of 1 =
second=20
  and supported by 4 leaf springs such that it has two degrees of =
freedom. The=20
  electronics gives the pendulum a period of 50 seconds and uses an LED =
attached=20
  to projects a spot of light onto a quadrant photo detector thus =
resolving an X=20
  and Y components.
  
Orthogonal electromagnetic transducers hold the pendulum in a =
fixed=20
  position as in the broadband configuration. Examination of the P wave =
on an=20
  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=20
  up.  I am not a computer publishing expert,so rough is the =
operative=20
  word.
  
 
  
 
  
 
  
Martin Page