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Related Experiment Video

Updated: Jun 8, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 3, 2014

Bridging the gap between the Rayleigh and Thomson limits for spheres and spheroids.

G R Fournier, B T Evans

|September 22, 2010

Summary

This study introduces an exact transform for scattering coefficients, overcoming limitations of the Rayleigh and Thomson approximations for all refractive indices (m) and small particle sizes (x). A similar approximate transform is also developed for spheroids.

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Mechanical Mapping of Spheroids Using Brillouin Spectroscopy

Mechanical Mapping of Spheroids Using Brillouin Spectroscopy

Published on: December 12, 2025

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Last Updated: Jun 8, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 3, 2014

Mechanical Mapping of Spheroids Using Brillouin Spectroscopy

Mechanical Mapping of Spheroids Using Brillouin Spectroscopy

Published on: December 12, 2025

Area of Science:

Electromagnetic scattering theory
Optical properties of particles

Background:

The Rayleigh and Thomson approximations for light scattering have limitations related to the refractive index (m).
These approximations are restricted in their applicability based on the material's refractive index and particle size.

Purpose of the Study:

To present an exact transform of scattering coefficients that removes refractive-index restrictions.
To develop a new series valid for all refractive indices (m) and small particle sizes (x).
To introduce a similar approximate transform for spheroidal particles.

Main Methods:

Derivation of an exact transform for scattering coefficients.
Development of a series expansion based on the transform.
Formulation of an approximate transform specifically for spheroids.

Main Results:

The presented exact transform is valid for all values of m.
The resulting series is applicable for small x, extending beyond Rayleigh and Thomson limits.
An approximate transform for spheroids is also derived.

Conclusions:

The new transform offers a more general approach to scattering calculations, especially for particles with arbitrary refractive indices.
This work provides a valuable tool for analyzing light scattering phenomena in various scientific disciplines.
The approximate transform for spheroids offers a practical solution for non-spherical particle analysis.