Improved Flow Visualization Methods Based on the Background Oriented Schlieren Technique
نویسندگان
چکیده
منابع مشابه
Optical-flow-based background-oriented schlieren technique for measuring a laser-induced underwater shock wave
The background-oriented schlieren (BOS) technique with the physicsbased optical flow method (OF-BOS) is developed for measuring the pressure field of a laser-induced underwater shock wave. Compared to BOS with the conventional cross-correlation method in PIV (called PIV-BOS), by using the OF-BOS, the displacement field generated by the small density gradient in water can be obtained at the spat...
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This paper describes the implementation of a novel technique called Background Oriented Schlieren that can produce quantitative visualization of density in a flow. This technique uses only a digital still camera, a structured background, and inverse tomographic algorithms which can extract two-dimensional slices from a three-dimensional flow. This has been applied to obtain the density field fo...
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Two quantitative schlieren methods are assessed and compared: calibrated color schlieren (CCS) and background oriented schlieren (BOS). Both methods are capable of measuring the light deflection angle in two spatial directions, and hence the projected density gradient vector field. Spatial integration using the conjugate gradient method returns the projected density field. To assess the perform...
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Schlieren visualization is one of the simplest ways of determining the geometric parameters of an ultrasonic beam generated by diagnostic transducers, and is recommended for evaluating the potential and the limitations of ultrasonic equipment used in diagnostic applications.’ Apart from some special cases, for example, dynamically focused and/or scanned receiving arrays, the shape of the transm...
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Blade-tip vortices and their interaction with the helicopter blades play an important role in the generation of noise on rotorcrafts. Full-scale vortex visualization is essential for the understanding of these effects and the validation of sub-scale experiments and numerical simulations. In the present work, the reference-free Background Oriented Schlieren (BOS) method was used to visualize bla...
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ژورنال
عنوان ژورنال: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
سال: 2011
ISSN: 0387-5016,1884-8346
DOI: 10.1299/kikaib.77.2391