The Wavelength Reconstruction
From Toroidal Spectrometer Image Data
Author(s)
J. Blazej, M. Tamas, L. Pina, A. Jancarek, S. Palinek, P. Vrba
& M. Vrbova
Abstract
We are reporting spectroscopy studies of Nitrogen filled capillary discharge. The
identification procedure of spectra was carried out with the use of an extreme
ultraviolet grazing incidence spectrometer with toroidal grating. The source of
radiation and the object under study is a pinching alumina capillary discharge in
Nitrogen, where stimulated emission in the 13.4 nm wavelength region is
expected. To simplify the alignment of the spectrometer during the experiment
the off Rowland circle registration scheme is used. In this scheme, spectra are
recorded in a single plane and thus exact focusing of the input slit takes place
only for one single wavelength, which corresponds to the intersection of the
plane of registration with the Rowland circle. Appropriate image processing
must be applied to reconstruct the spectra profile and to calibrate wavelength
positions. The cooled extreme ultraviolet sensitive CCD camera was used in the
role of planar detector. It has a 512×512 elements matrix with 24 µm square
pixels. The 16-bit dynamic range together with very low-noise provide a good
data source for image post-processing. The experimental impossibility to record
simultaneously zeroth order maximum and the first diffraction order spectrum
was a crucial problem in the presented process. The presented methodology can
be applied to any experiment using toroidal grating spectrometer.
Keywords: spectrometer, image distortion, calibration.
1 Introduction
We are reporting spectroscopy studies of Nitrogen filled capillary discharge. The
goal of our work is to create a technique for routine use of a spectrometer with
Keywords
spectrometer, image distortion, calibration.
Related Book
Other papers in this volume
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