Multiple scattering correction in the measurement of particle size and number density by the diffraction method

Gomi, Hiromi

doi:10.1364/ao.25.003552

Cited by 21 publications

(11 citation statements)

References 12 publications

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“…The first concern is related to the appropriateness of the selected physical model to describe the multiple scattering, which can only be justified by a rigorous testing of the numerical predictions against experimental data. As discussed by Gomi (1986) this validation has not been demonstrated yet. The second concern is a more practical issue: unless simplified to easily managable algorithms, the existing models may not be suitable for use in data processors and PCs used with light-scattering systems, even main frame computer runs can be prohibitive (Gomi, 1986).…”

Section: Empirical Equations and Discussionmentioning

confidence: 89%

“…As discussed by Gomi (1986) this validation has not been demonstrated yet. The second concern is a more practical issue: unless simplified to easily managable algorithms, the existing models may not be suitable for use in data processors and PCs used with light-scattering systems, even main frame computer runs can be prohibitive (Gomi, 1986). The present empirical approach does not shed any light on the physics of multiple scattering in dense drop fields, but it is simple and easy to use, and accurate within the specified range.…”

Section: Empirical Equations and Discussionmentioning

confidence: 89%

“…Although the ultimate correction scheme should be obtained through modeling of multiple scattering of the light by a polydisperse drop field, as demonstrated by Gomi (1986), Hirleman (1986), and Harnidi and Swithenbank (1986), there exist two concerns related to the immediate application of these models. The first concern is related to the appropriateness of the selected physical model to describe the multiple scattering, which can only be justified by a rigorous testing of the numerical predictions against experimental data.…”

Section: Empirical Equations and Discussionmentioning

confidence: 99%

“…The mathematical model developed by Hamidi and Swithenbank (1986) to correct the effect of multiple scattering for any type of size distribution has not been extensively tested against experimental data, and some problems related to the formulation have been recently discussed by Gomi (1986).…”

Section: Introductionmentioning

confidence: 99%

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Multiple Scattering Effects in Dense Spray Sizing by Laser Diffraction

Gülder

1990

Aerosol Science and Technology

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The purpose of the reported work is to present practical described. Data from the experimental program were schemes to correct the effect of multiple scattering in a employed to develop empirical expressions to correct the dense drop field on the measured distribution parameters measured spray parameters at high obscuration levels. by laser light scattering-based spray sizing techniques.Accuracies of the proposed expressions are acceptable An experimental study, involving multimodal distribufor engineering applications and comparable to the accutions and drop fields which can not be adequately deracies involved in converrion of light scattering data to scribed by single-mode two-parameter distributions, is drop size information.

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Section: Empirical Equations and Discussionmentioning

confidence: 89%

Section: Empirical Equations and Discussionmentioning

confidence: 89%

Section: Empirical Equations and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multiple Scattering Effects in Dense Spray Sizing by Laser Diffraction

Gülder

1990

Aerosol Science and Technology

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“…Other theoretical approaches for particles size analyses when multiple scattering occurs were described by Gomi [9] and Hirleman [5]. They are not considered here, because they are not directly relevant to this work.…”

Section: Multiple Scatteringmentioning

confidence: 99%

Use of the Laser Diffraction Technique for Particle Size Measurement at high suspension densities

Ulrich

Stepanski

1990

Part & Part Syst Charact

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A laser diffraction technique for the on‐line measurement of crystal growth rates was developed. The crystal growth experiments were executed in a fluidized bed apparatus with a specially designed measuring chamber. It is typical in crystallization from solutions to deal with non‐spherically shaped particles at high suspension densities (3‐25 Vol.‐%). The results achieved in a first approach with commercially available instruments were not understandable. It was shown that the particle size distributions from experiments at high suspension densities depend on the volume concentration. This effect was examined by experiments with constant particle sizes and different volume concentrations. If the volume concentration is detected and used to correct the results achieved for the particle size distribution, understandable and reproducible results can be obtained. The necessary correlation function for the measurements at high suspension densities is introduced.

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Light‐scattering characterization of polyblends in the presence of multiple‐scattering conditions

Cielo

Favis

Maldague

1987

Polymer Engineering & Sci

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A novel approach is described for the noncontact evaluation of structural morphology in polyblends by light scattering. Optical methods are attractive for the on‐line characterization of translucent materials because they are noninvasive, rapid, and applicable to high temperature materials. One limitation of conventional light‐scattering techniques is their requirement for relatively thin samples in order to avoid multiple‐scattering effects that smear out the details of the light diffraction pattern. The approach described in this paper is meant to circumvent this limitation by resorting to turbidimetric measurements, which provide useful information on the average size, shape, concentration, and orientation of the dispersed phase particles even in the presence of multiple scattering. The sample thickness is no longer restricted, and methods are described by which the near‐surface volume of infinitely thick parts may be inspected with access to a single side of the material. Results are presented for polypropylene‐polycarbonate (PP/PC) samples of different thicknesses and microstructural morphology, including fibrillar‐type oriented structures.

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Multiple scattering correction in the measurement of particle size and number density by the diffraction method

Cited by 21 publications

References 12 publications

Multiple Scattering Effects in Dense Spray Sizing by Laser Diffraction

Multiple Scattering Effects in Dense Spray Sizing by Laser Diffraction

Use of the Laser Diffraction Technique for Particle Size Measurement at high suspension densities

Light‐scattering characterization of polyblends in the presence of multiple‐scattering conditions

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