Digital image plane holography (DIPH) for two-phase flow diagnostics in multiple planes

Palero, Virginia; Lobera, Julia; Arroyo, M. P.

doi:10.1007/s00348-005-0982-8

Cited by 21 publications

(13 citation statements)

References 4 publications

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“…The feasibility of holographic ILIDS measurements on bubbles for this angle was demonstrated by Palero et al (2005) and of in-focus GPVS measurements by Dehaeck et al (2004). While measuring at 90 • has its obvious advantages, a two laser-sheet configuration at 96 • also has several merits.…”

Section: Introductionmentioning

confidence: 91%

“…This idea was extended to the case of an intersecting angle of 180 • , i.e. simple opposition of the two laser-sheets by Dehaeck et al (2004) and Palero et al (2005). This creates an additional externally reflected glare point and a symmetrical set-up can now be constructed where the camera is placed at 90 • to image two equally intense externally reflected glare points.…”

Section: Introductionmentioning

confidence: 99%

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Multifrequency interferometric particle imaging for gas bubble sizing

Dehaeck

Beeck

2008

Exp Fluids

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A new configuration for measuring bubbles with ILIDS (Interferometric Laser Imaging for Droplet Sizing) is proposed. In this configuration, perpendicularly polarized light scattered by a bubble is gathered at 90 •. In this signal, two dominant frequencies are present, whose origin is explained and experimentally verified. Numerical simulations demonstrate how this frequency signature can be used to improve the robustness of the standard ILIDS technique and reject non-spherical bubbles.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Multifrequency interferometric particle imaging for gas bubble sizing

Dehaeck

Beeck

2008

Exp Fluids

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“…The reason behind the occurrence of the droplet positioning error was attributed to "the accuracy of position calibration caused by the use of two cameras for each measurement". Two other exceptions are Palero et al (2005Palero et al ( , 2007 who used a holographic technique to record the defocused image fields of the dispersed phase, collecting light at a scattering angle of 90°, with the convenience of using a single camera. They were able to reconstruct the particle image in any defocused, or in the best-focused, plane by numerically propagating the defocused image, thus implicitly eliminating any discrepancy in particle position in addition to avoiding the inconvenience of fringe overlapping.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous planar measurement of droplet velocity and size with gas phase velocities in a spray by combined ILIDS and PIV techniques

et al. 2010

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A new approach for simultaneous planar measurement of droplet velocity and size with gas phase velocities is reported, which combines the out-of-focus imaging technique 'Interferometric Laser Imaging Droplet Sizing' (ILIDS) for planar simultaneous droplet size and velocity measurements with the in-focus technique 'Particle Image Velocimetry' (PIV) for gas velocity measurements in the vicinity of individual droplets. Discrimination between the gas phase seeding and the droplets is achieved in the PIV images by removing the glare points of focused droplet images, using the droplet position obtained through ILIDS processing. Combination of the two optical arrangements can result in a discrepancy in the location of the centre of a droplet, when imaging through ILIDS and PIV techniques, of up to about 1 mm which may lead to erroneous identification of the glare points from droplets on the PIV images. The magnitude of the discrepancy is a function of position of the droplet's image on the CCD array and the degree of defocus, but almost independent of droplet size.Specifically, it varies approximately linearly across the image along the direction corresponding to the direction of propagation of the laser sheet for a given defocus setting in ILIDS. The experimental finding is supported by a theoretical analysis, which was based on geometrical optics for a simple optical configuration that replicates the essential features of the optical system. The discrepancy in the location was measured using a monodisperse droplet generator and this was subtracted from the droplet centres identified in the ILIDS images of a polydisperse spray without 'seeding' particles. This reduced the discrepancy between PIV and ILIDS droplet centres from about 1 mm to about 0.1 mm and hence increased the probability of finding the corresponding fringe patterns on the ILIDS image and glare points on the PIV image. In conclusion, it is shown that the proposed combined method can discriminate between droplets and 'seeding' particles and is capable of two-phase measurements in polydisperse sprays.

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“…At least six physical quantities allow the separation of particle stray-light from different light sheets: polarization [3], wavelength [4,5], time [6], phase (holography) [7], size of defocus blur [8] and parallax (herein presented). Techniques using volumetric illumination are: holographic PIV [2], tomographic PIV [9], defocussing PIV [10], astigmatism PIV [11] and synthetic-aperture PIV [12].…”

Section: Introductionmentioning

confidence: 99%

“…No inverse multiplexing units are required (see e.g. [3][4][5][6][7]). Such a single-camera 3D-technique enables the observation of flows through narrow viewports and minimizes hardware complexity.…”

Section: Introductionmentioning

confidence: 99%

Multiple-plane particle image velocimetry using a light-field camera

Skupsch¹,

Brücker²

2013

Opt. Express

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract: Planar velocity fields in flows are determined on parallel measurement planes simultaneously by means of an in-house manufactured light-field camera. The planes are defined by illuminating light sheets with constant spacing. Particle positions are reconstructed from a single 2D recording taken by a CMOS-camera equipped with a high-quality doublet lens array. The fast refocusing algorithm bases on synthetic-aperture particle image velocimetry (SAPIV). Reconstruction quality is tested by ray-tracing of synthetically generated particle fields. Influence of image processing is documented. The introduced single-camera SAPIV is applied to a convective flow within a measurement volume of 30x30x50mm³. Permanent repository link References and links1. C. E. Willert and M. Gharib, "Digital particle image velocimetry," Experiments in Fluids 10, 181-193 (1991). 2. K. D. Hinsch, "Three-dimensional particle velocimetry," Meas. Sci. Technol 6, 742-753 (1995). 13. B. Wilburn, Joshi N., Vaish V., Talvala E. V., Antunez E., Barth A., Adams A., Horowitz M., and Levoy M., "High performance imaging using large camera arrays," ACM Transactions on Graphics 24 (2005). 14. M. Levoy, "Light fields and computational imaging," Computer 39, 46-55 (2006

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Digital image plane holography (DIPH) for two-phase flow diagnostics in multiple planes

Cited by 21 publications

References 4 publications

Multifrequency interferometric particle imaging for gas bubble sizing

Multifrequency interferometric particle imaging for gas bubble sizing

Simultaneous planar measurement of droplet velocity and size with gas phase velocities in a spray by combined ILIDS and PIV techniques

Multiple-plane particle image velocimetry using a light-field camera

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