Assessment of some experimental and image analysis factors for background-oriented schlieren measurements

Ardian B. Gojani, Shigeru Obayashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Quantitative measurements of fluid flow properties can be achieved by background-oriented schlieren (BOS). In this paper, it is shown that this depends on several factors. Image-quality index is used to investigate the influence of the image sensor and the quality of its output. Image evaluation is applied to synthetic images, which are treated with a step function, so that they simulate the sharp density jump. The gradual change of the evaluated vector shift revealed the major dependence on the interrogation window, and revealed less of a dependence on background features. BOS applied to shock-wave reflection from a wedge in a shock tube gave qualitative results, due to large uncertainties. But, the application to cooling by natural convection gave satisfactory results, comparable to thermocouple data and theory.

Original languageEnglish
Pages (from-to)7554-7559
Number of pages6
JournalApplied optics
Volume51
Issue number31
DOIs
Publication statusPublished - 2012 Nov 1

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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