PSN-L Email List Message

Subject: Re: Orthogonal seismometer
From: "Juan" stauffer@................
Date: Mon, 22 Feb 2010 12:26:10 -0430


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.
 
 
 
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