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Re: wavelength calibration [message #78242 is a reply to message #69965]

Tue, 01 November 2011 12:41

Brian Wolven
Messages: 94
Registered: May 2011

Member

The approach I've used is to perform a windowed cross-correlation of the observed spectrum with a synthetic spectrum, e.g., one generated from a line list. The exact window shape and size would depend on what your spectra look like; mine are essentially gaussians centered on the positions of the known strong emission lines. I then perform a low-order polynomial fit to the wavelength/spectral bin coordinate pairs obtained from the set of cross-correlations. In order for this approach to work well you need to have a pretty good handle on your instrument's line shape/PSF, as you'll probably want to convolve that shape with your synthetic line positions before doing the cross-correlation.

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[Message index]

		wavelength calibration By: sid on Fri, 19 February 2010 21:38
		Re: Wavelength Calibration By: Nikola on Sat, 23 July 2011 00:57
		Re: wavelength calibration By: rogass on Thu, 03 November 2011 13:05
		Re: wavelength calibration By: Brian Wolven on Tue, 01 November 2011 12:41
		Re: wavelength calibration By: Jeremy Bailin on Tue, 01 November 2011 12:24

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