2015
DOI: 10.1007/s00348-015-2100-x
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A direct approach for instantaneous 3D density field reconstruction from background-oriented schlieren (BOS) measurements

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Cited by 88 publications
(63 citation statements)
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“…In addition to the refractive index and the density, temperature field or other quantities can be further inferred by analysing the BOS images (Tokgoz et al 2012). In the past two decades, the BOS technology has been applied to various applications in fluid mechanics (Venkatakrishnan & Meier 2004;Goldhahn & Seume 2007;Nicolas et al 2017;Grauer et al 2018). However, despite the substantial improvements of the hardware (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…In addition to the refractive index and the density, temperature field or other quantities can be further inferred by analysing the BOS images (Tokgoz et al 2012). In the past two decades, the BOS technology has been applied to various applications in fluid mechanics (Venkatakrishnan & Meier 2004;Goldhahn & Seume 2007;Nicolas et al 2017;Grauer et al 2018). However, despite the substantial improvements of the hardware (e.g.…”
Section: Introductionmentioning
confidence: 99%
“…Intensive efforts have been made recently to apply BOS method to measure three-dimensional (3D) refractive index n, or density fields, of non-reactive and reactive flows (Venkatakrishnan and Meier 2004;Goldhahn and Seume 2007;Atcheson et al 2008;Nicolas et al 2016;Hayasaka et al 2016;Grauer et al 2018). The tomographic reconstruction of the 3D n field requires multiple 2D projected views from different viewing angles.…”
Section: Introductionmentioning
confidence: 99%
“…The tomographic reconstruction of the 3D n field requires multiple 2D projected views from different viewing angles. These projected views can be obtained by triggering different cameras simultaneously (Nicolas et al 2016) or by one camera with a fiber bundle enabling multiple views at the expense of reduced resolution (Liu et al 2019), or by rotating one camera around the probed volume assuming steady or periodic flows (Ota et al 2011;Lang et al 2017). Achieving sufficient spatial resolution and accuracy of the 3D n field is time-consuming and computationally expensive.…”
Section: Introductionmentioning
confidence: 99%
“…Thus, a complex mapping function approach is widely used and applied to measure three-dimensional flow without the shape function [18]. For the complex mapping function, an indirect iterative method is used, such as gradient descent method [20] or tomography techniques [17], which is conventional but consumes a relatively large amount of the computation time.…”
Section: Introductionmentioning
confidence: 99%