comp.lang.idl-pvwave archive: archive » IDL FFT (spec -> interferogram)

Home » Public Forums » archive » IDL FFT (spec -> interferogram)

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: IDL FFT (spec -> interferogram) [message #30111 is a reply to message #30034]

Mon, 08 April 2002 10:34

Robert Stockwell
Messages: 74
Registered: October 2001

Member

Paul van Delst wrote:

> But one doesn't always want the power spectrum. Usually (in my field at least) one wants the
> complex valued spectrum where the imaginary component is known and happily zero. (Don't know if
> Randall wants that tho')

> paulv

isn't that the same thing? ( real eq complex with imag=0)
If the interferrogram is indeed the autocorrelation function,
then the power spectrum is all you have, you cannot deduce
any phase info.

Having said that, it is conceivable that one can create a
complex interferrogram (for instance, combining two different
channels etc), but in the "usual" (i.e. that I am familiar with),
an interferrogram is an scalar autocorrelation function.

Cheers,
bob

Report message to a moderator

[Message index]

		IDL FFT (spec -> interferogram) By: Randall Skelton on Thu, 04 April 2002 07:27
		Re: IDL FFT (spec -> interferogram) By: Robert Stockwell on Tue, 09 April 2002 07:04
		Re: IDL FFT (spec -> interferogram) By: Randall Skelton on Mon, 08 April 2002 15:00
		Re: IDL FFT (spec -> interferogram) By: Paul van Delst on Mon, 08 April 2002 11:36
		Re: IDL FFT (spec -> interferogram) By: Robert Stockwell on Mon, 08 April 2002 10:34
		Re: IDL FFT (spec -> interferogram) By: Paul van Delst on Mon, 08 April 2002 07:14
		Re: IDL FFT (spec -> interferogram) By: Robert Stockwell on Sat, 06 April 2002 11:54
		Re: IDL FFT (spec -> interferogram) By: Paul van Delst on Fri, 05 April 2002 07:36

Previous Topic:	Re: Code code code
Next Topic:	Alpha Blending

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Wed Oct 08 19:26:00 PDT 2025

Total time taken to generate the page: 0.00452 seconds