[irised] Some AmaSeis improvements

[Alan Jones]

Tom,

The analog-to-digital converter (the black box) has a zero-setting knob which is very sensitive. Also, I believe that the electronic components alter their characteristics change. It has nothing to do with the boom not being centered because the device reads velocity, not position. It can be way off center but still have the trace right on line. There are two ways to recenter the line: (1) with the knob or (2) with the zero adjustment in AmaSeis.

Alan
  ----- Original Message ----- 
  From: Tom Blake 
  To: Alan Jones 
  Cc: IRISED 
  Sent: Monday, May 19, 2008 5:34 AM
  Subject: Re: [irised] Some AmaSeis improvements



  I had a query from a teacher who is using the Amaseis software. I
  noticed in a helicorder screen dump that he sent me, that the seismic
  trace was not co-incident with the helicorder hour line, so I asked him
  to adjust the zero value until there both were  co-incident, but then he
  replied  with this question,

  What is the origin of the zero value, is it due to the boom not being
  perfectly centred and causing an offset in the voltage output of the
  coil?? Just wondering?

  Would anyone suggest an answer, please

  Sincerely
  Tom Blake


  Alan Jones wrote:
  > I have made some small changes in AmaSeis and in the Stations program.
  >  
  > *2008.02.02: *At request of John Lahr, Normalized the Fourier
  > Transform so that when analyzing noise, the amplitude remains
  > relatively constant as you extract different length signsls. Stations
  > program in AmaSeisAux now automatically downloads the
  > IRISEdStations.xml file from the IRIS download site.
  >  
  > The Stations program displays a map of the world showing the stations
  > that are providing real-time upload of their data. You just click on
  > one of these stations and the last day's data are downloaded and
  > displayed on an AmaSeis screen. Consider adding your station to those
  > who are automatically uploading their data.
  >  
  > To obtain these programs, follow this link:
  >  
  > http://bingweb.binghamton.edu/~ajones/AmaSeis.html
  > <http://bingweb.binghamton.edu/%7Eajones/AmaSeis.html>
  >  
  > Note, that this link has changed. The older www.geol.binghamton.edu
  > <http://www.geol.binghamton.edu> computer is being phased out. Please
  > change your links.
  >  
  > Alan
  >
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  -- 
  ====================================================================
  Thomas Blake,    (Experimental Officer)   E-mail tb at cp.dias.ie
  Geophysics Section, School of Cosmic Physics,
  Dublin Institute for Advanced Studies    
  5 Merrion Square                          VOIP  353-1-6535147 x 223
  Dublin 2                                  Phone 353 1 662 1333
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  Web Address:                             WWW http://www.dias.ie/~tb/
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