how to phased spectra?

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2 total messages Started by Vladimir Korostelev Wed, 06 Dec 2000 15:35

#128

Author: Vladimir Korostelev
Date: Wed, 06 Dec 2000 15:35

25 lines
1720 bytes

Hello All ,

The spectrometers commonly provide a possibility to record spectra
as properly presented the complex and real parts of FT. Spectra're often
presented in two standard modes :

1) 'absolute value' mode, where spectrum is the product:

         spectrum(f)*conj[spectrum(f)]

(conj -- complex conjugation)

2) 'phased spectrum' mode, where spectrum is the sum:

         real[spectrum(f)] *cos(alpha) + Im[spectrum(f)] *sin(alpha)

alpha is an angle of phasing. MY QUESTION IS: IF I HAVE JUST
A DOUBLE SET OF DATE ( ITS REAL and IMAGINARY PARTS)
THEN  HOW  TO  DEFINE WHAT VALUE OF alpha SHOULD BE
TAKEN?
Spectrometer usually does it automatically, but my project requires
that I know it myself. Reference book of the spectrometer I use
(NMR spectrometer Varian VXR-500S) hasn't enough info about it.

              Any help or suggestion is very much welcome!

Re: how to phased spectra?

#130

Author: Vladimir Korostelev
Date: Fri, 08 Dec 2000 11:57

3 lines
988 bytes

I'm sorry for this multiple posting

Vladimir Korostelev

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