Hey all,(adsbygoogle = window.adsbygoogle || []).push({});

I'm doing a cosine/sine inverse fourier transform of some interferometer data in IDL and I'm having some serious issues. I'm thinking that the cosine/sine is possibly overflowing...but I'm not sure. Here is my code:

BPs, BPc, and BP are all float arrays of dimensions [16,2,701]Code (Text):

;Inverse Fourier Transform

29 for i=0,15 do begin ;Channel

30 for j=0,1 do begin ;Spectrograph

31 for k=0,700 do begin ;Wavenumber

32 int = reform(counts[i,j,*])

33 x = 2 * !pi * v[k] * p

34 BPc[i,j,k] = 4 * total(int * cos(x))

35 BPs[i,j,k] = 4 * total(int * sin(x))

36 BP[i,j,k] = sqrt(BPs[i,j,k]^2 + BPc[i,j,k]^2)

37 endfor

38 endfor

39 endfor

Counts is the photon counts of the input spectrum. This is what I'm taking the IFT of.

v[k] is the wavenumber

p is the frame location of the interferometer

I'm not extremely familiar with IDL, I'm having to use it for this job, but I have never used it before.

I know this may be hard to debug without more background information, I'm hoping that there is some obvious mistake or someone here is an IDL guru. Thanks for any help,

-Dylan

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Cosine Fourier Transform Spectroscopy

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

**Physics Forums | Science Articles, Homework Help, Discussion**