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wavelength calibration
| wavelength calibration [message #78256] |
Tue, 01 November 2011 07:08 |
Gray
Messages: 253
Registered: February 2010
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Senior Member |
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Hello IDL gurus,
I have a night-sky emission spectrum (from my data), and a list of
irregularly-gridded night-sky lines (from the literature). I'm trying
to perform a wavelength calibration of my data; I have a quite poor
zeroth-order solution already.
My best idea so far was to perform a cross-correlation of the two data
sets to find the wavelength shift and then do some least-squares
fitting to find a better solution. However, I'm not sure how to
perform the cross-correlation.
My data is in the form:
(a) n-element array of spectrum data points
(b) n-element array of zeroth-order wavelengths
(c) m-element array of night-sky emission line wavelengths (irregular)
(d) m-element array of night-sky emission line strengths
So my questions are:
1) How do I compute the cross-correlation between these two sets of
data?
2) Is this the best way to go about it?
Thank you as always...
--Gray
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