PSN-L Email List Message

Subject: Re: Optical siesmometer
From: chrisatupw@.......
Date: Wed, 16 Jan 2013 06:14:43 -0500 (EST)




From: Larry Cochrane 
To: psnlist 
Sent: Wed, 16 Jan 2013 3:21
Subject: Fwd: Optical siesmometer



Subject: Optical seismometer
Date: Tue, 15 Jan 2013 15:33:51 -0600

Larry,
I thought you might find this interesting:
http://www.ctbto.org/fileadmin/user_upload/SandT_2011/presentations/T3-O5%2=
0J_Berger%20Optical%20Seismometer.pdf
-Charlie

Hi Charlie,=20
    It looks as if Mark & Co have done quite a bit more development work.=
=20
But amateurs would likely to have difficulty measuring optical fringes to=
=20
1/2 ppm / Root Hz and Michaelson Interferometers are not cheap.=20
Amateurs can get about 10 nano metres resolution over 10 Hz using large are=
a=20
photocells and a stabilised light source, but this is likely to be adequate=
 -=20
unless you can 'lay your hands' on a couple of redundant Streckheisens !
Regards,
Chris Chapman

=20

From: Larry Cochrane <lcochrane@..............>
To: psnlist <psnlist@..............>
Sent: Wed, 16 Jan 2013 3:21
Subject: Fwd: Optical siesmometer

Subject: Optical seismometer
Date: Tue, 15 Jan 2013 15:33:51 -=
0600

Larry,
I thought you might find this =
interesting:
http://=
www.ctbto.org/fileadmin/user_upload/SandT_2011/presentations/T3-O5%20J_Berg=
er%20Optical%20Seismometer.pdf
-Charlie

Hi Charlie, 
    It looks as if Mark & Co have done quite a =
bit more development work. 
But amateurs would likely to have difficulty measurin=
g optical fringes to 
<=
font size=3D"2">1/2 ppm / Root Hz and Michaelson Interferometers are not ch=
eap. 
=
Amateurs can get about 10 nano metres resolution over 10 Hz using large are=
a 
pho=
tocells and a stabilised light source, but this is likely to be adequate - =
unles=
s you can 'lay your hands' on a couple of redundant Streckheisens !<=
/tt>
Regards,
Chris Chap=
man

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