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Does anyone know 'Interferogram Phase Correction'? |
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kipi
Optics GrassHopper Joined: April/23/2008 Status: Offline Points: 3 |
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Posted: April/23/2008 at 06:11 |
Hello!
I have a question regarding 'Interferogram Phase Correction'.
Does anyone can refer me to some info regarding the extraction of information after Michelson - interferogram - phase - correction?
Thanks!!
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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what level?
basic knowledge
specific instrument
pretty broad question
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kipi
Optics GrassHopper Joined: April/23/2008 Status: Offline Points: 3 |
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I guess that the level is quite basic... The instrument is 'Michelson interferometer'. I performed a phase correction on the obtained spectrum and as a result got a symmetric interferogram (after the inverse fft). I need some info regarding the use of the symmetric interferogram. Why is it so important to get the symmetry? what kind of info can I extract from this? Since the spectrum remains unchanged (the changes in phase in the time-domain didn't change the data in the frequency-domain), what is the goal of 'zeroing' the phase? Thank you very much for your response! I hope I made my self clear enough. All I need is some kind of article (or a reference to a book or some kind of reading material) regarding this. All I found was information regarding the execution if the phase error correction, and not regarding the next step. Thanks again!.
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Dale Clifford
Optics Jedi Knight Joined: July/04/2004 Location: United States Status: Offline Points: 5087 |
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http://www.princeton.edu/~mlittman/SPIE_formated.pdf
what are you measuring atmospheric, telecsopce abbreation, oceanic water vapor?
zero is necessary to provide a baseline for the measurement.
fft shifts to frequency- the data is manipulated, then the inverse which reconstructs the data with the convolution or takes it out (time-series) in signal processing one can keep both if you use Laplace or Wavelet transforms instead.
your specific use of "michelson" suggest astronomy-- rather than signal processing per se.
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kipi
Optics GrassHopper Joined: April/23/2008 Status: Offline Points: 3 |
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Thank you very much for the article and your response mr.Dale. I'm testing the scattering from different materials for spectral imaging purposes. (I guess that the final processing can be related to dsp...). My goal is to get an accurate spectrum as possible from the same material in different tests. (Does this help..?) |
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trigger29
Optics Master Extraordinaire X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ? Joined: September/29/2007 Location: South Dakota Status: Offline Points: 4353 |
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Yeah..........thats what I was gonna say.? Or something like it.
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