Iterative noise removal from temperature and density profiles in the TJ-II Thomson scattering

GONZALO ALBERTO FARIAS CASTRO, S. Dormido-Canto, J. Vega, M. Santos, I. Pastor, SEBASTIAN CARLOS FINGERHUTH MASSMANN, J. Ascencio

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

TJ-II Thomson Scattering diagnostic provides temperature and density profiles of plasma. The CCD camera acquires images that are corrupted with some kind of noise called stray-light. This noise degrades both image contrast and measurement accuracy, which could produce unreliable profiles of the diagnostic. So far, several approaches have been applied in order to decrease the noise in the TJ-II Thomson scattering images. Since the presence of the noise is not global but located in some particular regions of the image, advanced processing techniques are needed. However such methods require of manual fine-tuning of parameters to reach a good performance. In this contribution, an iterative image processing approach is applied in order to reduce the stray light effects in the images of the TJ-II Thomson scattering diagnostic. The proposed solution describes how the noise can be iteratively reduced in the images when a key parameter is automatically adjusted during the iterative process.

Original languageEnglish
Pages (from-to)761-765
Number of pages5
JournalFusion Engineering and Design
Volume89
Issue number5
DOIs
StatePublished - 1 Jan 2014

Keywords

  • Image processing
  • Iterative noise reduction
  • Stray light
  • TJ-II Thomson scattering diagnostic

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