Enhancing the signal-to-noise ratio of pressure sensitive paint data by singular value decomposition

M. Pastuhoff, D. Yorita, K. Asai, P. H. Alfredsson

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

When using pressure sensitive paint under unsteady conditions in low-speed applications, the signal-to-noise ratio is usually low and may hinder the proper evaluation of the acquired data. Here, we propose a new noise-filtering scheme that is based on singular value decomposition. As a test case, we evaluate the fluctuating pressure field due to unsteady vortex shedding on the side of a square cylinder. The proposed scheme resulted in a reduction of pixel noise of the order of two magnitudes which made it possible to obtain results regarding the spatial form of flow structures as well as the shedding frequency.

Original languageEnglish
Article number075301
JournalMeasurement Science and Technology
Volume24
Issue number7
DOIs
Publication statusPublished - 2013 Jul

Keywords

  • noise filtering
  • pressure sensitive paint
  • proper orthogonal decomposition
  • singular value decomposition
  • square cylinder
  • vortex shedding

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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