Imaging in the optically dense regions of a spray: A review of developing techniques

Linne, Mark

doi:10.1016/j.pecs.2013.06.001

Cited by 204 publications

(119 citation statements)

References 56 publications

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“…The capabilities of the approaches for multiple scattering suppression and image formation have also been numerically modeled by means of Monte Carlo simulation. This article shows that both approaches efficiently suppress the contribution from multiple light scattering, providing 1 3 110 Page 2 of 17 developed in the past for the characterization of spray systems (Fansler and Parrish 2015;Linne 2013). Phase Doppler interferometry (Bachalo and Houser 1984) and laser diffraction (Dodge et al 1987) are among some of the most common techniques reported initially.…”

Section: Introductionmentioning

confidence: 98%

Comparison between two-phase and one-phase SLIPI for instantaneous imaging of transient sprays

et al. 2017

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images with an intensity profile close to the corresponding single scattering case. Experimentally, this suppression renders both an improvement in image contrast and the removal of undesired stray light components that could be interpreted as signal. However, while 2p-SLIPI preserves most of the initial spatial resolution, 1p-SLIPI results in a loss of spatial resolution, where high-frequency image information is not visible anymore. Thus, there is a tradeoff between preserving the most detailed information of the spray structure-with 2p-SLIPI-and being able to record an SLIPI image from a single modulated image only-with 1p-SLIPI. The comparison and technical overview of these two methods presented in this paper can facilitate in selecting which approach is the most suitable for a given application for spray visualization.

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Section: Introductionmentioning

confidence: 98%

Comparison between two-phase and one-phase SLIPI for instantaneous imaging of transient sprays

et al. 2017

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“…While a number of techniques have been developed to investigate important phenomena such as liquid breakup processes in the optically dense near-field of sprays [5][6][7][8], relatively few of these techniques have focused on binary liquid mixing prior to the onset of significant breakup and atomization. Conventional methods such as mechanical patternators [9,10] are ineffective in regions where the jets have not fully broken up into droplets, and laser-induced fluorescence [11][12][13] and attenuation techniques [2] suffer from complex refraction patterns at the highly deformed phase interfaces that develop near the impingement point.…”

Section: Introductionmentioning

confidence: 99%

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Halls¹,

Meyer²,

Kastengren³

2015

Opt. Express

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The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadrupletracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, nearfield liquid distributions in many mixing systems of practical interest involving two or more liquid streams. RightsThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be be found at the following URL on the OSA website: https://www.osapublishing.org/search.cfm?q=&j=oe&v=23&i=2&p=1730. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means in prohibited and is subject to penalties under law. Abstract:The complex geometry and large index-of-refraction gradients that occur near the point of impingement of binary liquid jets present a challenging environment for optical interrogation. A simultaneous quadruple-tracer x-ray fluorescence and line-of-sight radiography technique is proposed as a means of distinguishing and quantifying individual liquid component distributions prior to, during, and after jet impact. Two different pairs of fluorescence tracers are seeded into each liquid stream to maximize their attenuation ratio for reabsorption correction and differentiation of the two fluids during mixing. This approach for instantaneous correction of xray fluorescence reabsorption is compared with a more time-intensive approach of using stereographic reconstruction of x-ray attenuation along multiple lines of sight. The proposed methodology addresses the need for a quantitative measurement technique capable of interrogating optically complex, near-field liquid distributions in many mixing systems of practical interest involving two or more liquid streams.

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“…In terms of imaging applications, the latter approach remains the most popular in the literature and has generated renewed interest for imaging high-speed transient phenomena in scattering environments [3]. OKE gating arrangements typically achieve precise timing control by splitting the energy of an ultra-short laser pulse and adjusting the path length difference between the two beams in a pump/probe scheme to control the nonlinear interaction.…”

Section: Picosecond Time-gated Imagingmentioning

confidence: 99%

“…However, many real-world applications and phenomena of interest are intrinsically linked to turbid environments where light scattering and attenuation strongly limit the efficacy of optical methods. In a wide range of applications, from imaging in biological tissues [1,2], to measurements in turbulent multiphase flows [3], key information is scrambled by the distortion imparted to the light signal as it transits the measurement volume [4]. Informative optical diagnostics in such media require detailed understanding of the light source, propagation and scattering in the measurement volume, and a detection arrangement tailored to select the meaningful parts of the transmitted light signal.…”

Section: Introductionmentioning

confidence: 99%

Collinear, two-color optical Kerr effect shutter for ultrafast time-resolved imaging

Purwar¹,

Idlahcen²,

Rozé³

et al. 2014

Opt. Express

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Imaging with ultrashort exposure times is generally achieved with a crossed-beam geometry. In the usual arrangement, an off-axis gating pulse induces birefringence in a medium exhibiting a strong Kerr response (commonly carbon disulfide) which is followed by a polarizer aligned to fully attenuate the on-axis imaging beam. By properly timing the gate pulse, imaging light experiences a polarization change allowing time-dependent transmission through the polarizer to form an ultrashort image. The crossed-beam system is effective in generating short gate times, however, signal transmission through the system is complicated by the crossing angle of the gate and imaging beams. This work presents a robust ultrafast time-gated imaging scheme based on a combination of type-I frequency doubling and a collinear optical arrangement in carbon disulfide. We discuss spatial effects arising from crossed-beam Kerr gating, and examine the imaging spatial resolution and transmission timing affected by collinear activation of the Kerr medium, which eliminates crossing angle spatial effects and produces gate times on the order of 1 ps. In addition, the collinear, two-color system is applied to image structure in an optical fiber and a gasoline fuel spray, in order to demonstrate image formation utilizing ballistic or refracted light, selected on the basis of its transmission time. 16, 1868-1870 (1991). 9. K. M. Yoo, Q. Xing, and R. R. Alfano, "Imaging objects hidden in highly scattering media using femtosecond second-harmonic-generation cross-correlation time gating," Opt. Lett. 16, 1019Lett. 16, -1021Lett. 16, (1991. 10. S. Idlahcen, C. Rozé, L. Méès, T. Girasole, and J.-B. Blaisot, "Sub-picosecond ballistic imaging of a liquid jet,"Exp. Fluids 52, 289-298 (2011). 11. L. Wang, P. Ho, C. Liu, G. Zhang, and R. Alfano, "Ballistic 2-d imaging through scattering walls using an ultrafast optical Kerr gate," Science 253, 769-771 (1991). 12. R. Alfano, ed., Semiconductors probed by ultrafast laser spectroscopy (Academic, 1984, vol. II

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Imaging in the optically dense regions of a spray: A review of developing techniques

Cited by 204 publications

References 56 publications

Comparison between two-phase and one-phase SLIPI for instantaneous imaging of transient sprays

Comparison between two-phase and one-phase SLIPI for instantaneous imaging of transient sprays

Quantitative measurement of binary liquid distributions using multiple-tracer x-ray fluorescence and radiography

Collinear, two-color optical Kerr effect shutter for ultrafast time-resolved imaging

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