Application of rainbow refractometry for measurement of droplets with solid inclusions

Li, Can; Wu, Xuecheng; Cao, Jian-zheng; Gréhan, Gérard; Cen, Kefa

doi:10.1016/j.optlastec.2017.07.026

Cited by 14 publications

(4 citation statements)

References 41 publications

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“…The non-linearity indicates a decreasing sensitivity of the d D,10 on the angular rainbow position, especially below 10 μm. The increase in mean diameter d D,10 leads to a decrease in the angular rainbow maximum position, which is in agreement with literature [35], and to a narrowing of the peak. The latter may be caused by a dominant contribution of larger droplets to the scattering intensity and, in comparison, a rather insignificant scattering intensity from small droplets.…”

Section: Effect Of Drop Size Distributionsupporting

confidence: 91%

Theoretical investigation of global rainbow refractometry in spray combustion of polydisperse microdroplets

Stodt

Wriedt

Kiefer

et al. 2021

Journal of Modern Optics

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Global rainbow refractometry (GRR) is an important technique for temperature measurements of droplets and has been applied to a wide field of technical sprays. In this work, the application of GRR to sprays with droplets as small as 1 − 30 µm in diameter is investigated by means of Lorenz-Mie theory to evaluate the influence of varying droplet size distributions (DSD) and varying refractive indexes on the global rainbow. DSDs were found by fitting a Rosin-Rammler-Sperling-Bennett distribution to experimental data. Different DSDs, that are typical for flame spray pyrolysis applications were evaluated systematically with varying widths and mean diameters. A study of the angular rainbow maxima position with varying widths of DSDs shows a strong non-linearity. It is concluded that GRR experiments in polydisperse applications should be accompanied with an accurate sizing technique. Furthermore, possible droplet size-dependent distributions of refractive indexes within the samples may influence the results.

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Section: Effect Of Drop Size Distributionsupporting

confidence: 91%

Theoretical investigation of global rainbow refractometry in spray combustion of polydisperse microdroplets

Stodt

Wriedt

Kiefer

et al. 2021

Journal of Modern Optics

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show abstract

“…It is widely accepted that the analysis of coherent light scatteringboth spatial and temporalcan provide a versatile non-contact tool for such assessment (see e.g. [1][2][3][4][5][6][7] and references therein). When a coherent wave is scattered by a randomly inhomogeneous medium, like a suspension, a so called speckle pattern forms.…”

Section: Introductionmentioning

confidence: 99%

Assessing the properties of a colloidal suspension with the aid of deep learning

Jakubczyk

Stachurski

2021

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…The rainbow method is widely used in the field of refractive index measurement of small particles [14][15][16][17]. The refractive index of a particle can be accurately obtained by using the airy component of the first order rainbow distribution.…”

Section: Introductionmentioning

confidence: 99%

The measurement of chromatic dispersion of liquids based on rainbow technology with empirical mode decomposition

et al. 2021

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An acquisition system is designed to collect the rainbow signals at two different wavelengths simultaneously. The empirical mode decomposition (EMD) method was used to decompose and reconstruct the first-order rainbow signal. Airy, ripple and noise signal components were completely separated from the signal of the first-order rainbow by the EMD, and the refractive index of the droplet can be obtained by analyzing the separated airy structures. In our experiments, the rainbows from droplets of water, NaCl and C 6 H 12 O 6 aqueous solutions were collected and the rainbow signals were analyzed by EMD. Based on the Cauchy dispersion model, the coefficients and the dispersion relation of water, NaCl and C 6 H 12 O 6 aqueous solutions at different concentrations were obtained by measuring the refractive index at the wavelengths of 632.8 and 473 nm. We demonstrate an EMD-rainbow method to detect the chromatic dispersion of liquids.

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Application of rainbow refractometry for measurement of droplets with solid inclusions

Cited by 14 publications

References 41 publications

Theoretical investigation of global rainbow refractometry in spray combustion of polydisperse microdroplets

Theoretical investigation of global rainbow refractometry in spray combustion of polydisperse microdroplets

Assessing the properties of a colloidal suspension with the aid of deep learning

The measurement of chromatic dispersion of liquids based on rainbow technology with empirical mode decomposition

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