Results 141 to 150 of about 6,891,147 (192)
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Boundary-Layer Meteorology, 2013
A method for measuring the two-dimensional distribution of wind velocity vectors near a surface exposed to solar radiation, by tracking brightness temperature images instead of particle images, is proposed. It is based on time-sequential thermography with the algorithm used for particle image velocimetry. This thermal image velocimetry (TIV) was tested
Inagaki, A. +3 more
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A method for measuring the two-dimensional distribution of wind velocity vectors near a surface exposed to solar radiation, by tracking brightness temperature images instead of particle images, is proposed. It is based on time-sequential thermography with the algorithm used for particle image velocimetry. This thermal image velocimetry (TIV) was tested
Inagaki, A. +3 more
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The Journal of the Acoustical Society of America, 2020
We review a technique that we developed that combines shadowgraph or schlieren imaging with image processing tools to study the sound produced by turbulent shear flows. These flows are challenging acoustically because they are characterized by a distributed cloud of correlated sources that produce sound through multiple mechanisms.
Nathan E. Murray +2 more
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We review a technique that we developed that combines shadowgraph or schlieren imaging with image processing tools to study the sound produced by turbulent shear flows. These flows are challenging acoustically because they are characterized by a distributed cloud of correlated sources that produce sound through multiple mechanisms.
Nathan E. Murray +2 more
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Measurement science and technology, 2020
Particle tracking velocimetry (PTV) and particle image velocimetry (PIV) are popular experimental methods to quantitatively measure flow fields. In many practical applications, hardware limitations result in longer exposure times, causing particle images
M. Qureshi, W. Tien, Yi-Jiun Lin
semanticscholar +1 more source
Particle tracking velocimetry (PTV) and particle image velocimetry (PIV) are popular experimental methods to quantitatively measure flow fields. In many practical applications, hardware limitations result in longer exposure times, causing particle images
M. Qureshi, W. Tien, Yi-Jiun Lin
semanticscholar +1 more source
Applied Optics, 1988
A new technique, digital image velocimetry, is proposed for measurement of instantaneous velocity fields of time dependent flows. A time sequence of single-exposure images of seed particles are captured with a high speed camera, and the sampled images are then digitized on an image processor, enhanced, and superposed to construct a multiple-exposure ...
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A new technique, digital image velocimetry, is proposed for measurement of instantaneous velocity fields of time dependent flows. A time sequence of single-exposure images of seed particles are captured with a high speed camera, and the sampled images are then digitized on an image processor, enhanced, and superposed to construct a multiple-exposure ...
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Tomographic particle image velocimetry
Experiments in Fluids, 2006This paper describes the principles of a novel 3D PIV system based on the illumination, recording and reconstruction of tracer particles within a 3D measurement volume. The technique makes use of several simultaneous views of the illuminated particles and their 3D reconstruction as a light intensity distribution by means of optical tomography.
G. Elsinga +3 more
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Electrooptical image shifting for particle image velocimetry
Applied Optics, 1988The direction of fluid motion can be determined in particle image velocimetry (and laser speckle velocimetry) if the image field is spatially shifted between the first and second exposures, so that the most negative fluid velocity still produces a positive particle image displacement. Two new techniques are described which accomplish very fast accurate
C C, Landreth, R J, Adrian
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A Microparticle Image Velocimetry Based on Light Field Imaging
IEEE Sensors Journal, 2019Accurate 3D flow characterization in a microchannel is becoming increasingly important for the design and development of microfluidic chips. In recent years, a light field camera that can simultaneously record the direction and position information of ...
Xian Song +4 more
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Spatial Spectrum From Particle Image Velocimetry Data
Journal of Nuclear Engineering and Radiation Science, 2019We present a simple method of obtaining the turbulence kinetic energy spectrum from spatially resolved particle image velocimetry (PIV) data without need of use of Taylor hypothesis of frozen turbulence. Additionally, this method allows us to extract the
Daniel Duda, V. Uruba
semanticscholar +1 more source
2020
Moving fluids have always been an object of fundamental physical research. An understanding of the dynamic behavior of streaming liquids and gases is the basis for disciplines in engineering ranging from the design of aircraft and ships to harbor development, wavebreaker projects, cavitation erosion, or sound production and attenuation.
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Moving fluids have always been an object of fundamental physical research. An understanding of the dynamic behavior of streaming liquids and gases is the basis for disciplines in engineering ranging from the design of aircraft and ships to harbor development, wavebreaker projects, cavitation erosion, or sound production and attenuation.
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Ultrasound imaging velocimetry of the human vitreous
Experimental Eye Research, 2012Knowledge of vitreous motion in response to saccades is a prerequisite for understanding vitreous rheology. Purpose of present paper is to introduce Ultrasound Image Velocimetry of the human eye, measure scleral and vitreous velocity fields and test the reproducibility of the proposed technique.
T. Rossi +7 more
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