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In this paper, PIV and DSPI as an alternative to stereo PIV on the measurements of 3-C velocity fields is analysed . DSPI as a velocimetry technique is described , including a discussion on the necessary requirements for going from a PIV setup into a DSPI setup and the different suitable geometries for combining PIV and DSPI. Some results from a turbulent boundary layer flow in a wind tunnel are presented...
The present work shows how the SPS-ESPI recordings can alternatively be analysed as Digital Image Plane Holographic (DIPH) recordings. When the SPS-ESPI recordings are analysed using a DIPH analysis, both the phase and intensity can be independently retrieved at each point of the fluid plane. The three velocity components in a fluid plane could be measured, since the phase maps detect an out-ofplane...
This paper analyses several parallel approaches for the development of a physical model of Non-linear ODT for its application in velocimetry techniques. The main benefits of its application in HPIV are the high accuracy with non-damaging radiation and its imaging capability to recover information from the vessel wall of the flow. Thus ODT-HPIV is suitable for microfluidic devices and biofluidic applications...
Abstract: Scanning white light interferometry (SWLI) is an increasingly popular method to measure the surface profile of miniature components. Although it is tolerant to step changes in profile, its capability to measure the large surface gradients that are characteristic of high‐aspect‐ratio surfaces is limited. This is in part due to the numerical aperture of the objective lens which restricts...
A technique for measuring the size and displacement of the disperse phase in two planes of a two-phase flow is presented. Digital image plane holography (DIPH) is used for the simultaneous recording and independent reconstruction of both planes. Each fluid plane is illuminated with two laser sheets propagating in opposite directions. The defocused image fields are holographically recorded at 90°,...
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