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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

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Shadow Doppler technique for sizing particles of arbitrary shape.

Y Hardalupas, K Hishida, M Maeda

|October 22, 2010

Summary

This study introduces a modified laser Doppler velocimeter for precise particle size and shape measurement. The shadow Doppler technique offers advantages in accuracy, robustness, and cost for irregular particle analysis.

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Area of Science:

Fluid dynamics
Optical metrology
Particle characterization

Background:

Accurate measurement of irregular particle size and shape is crucial in various scientific and industrial applications.
Existing techniques often face limitations in accuracy, robustness, or cost-effectiveness.

Purpose of the Study:

To develop and validate a modified laser Doppler velocimeter (LDV) for measuring the size and shape of irregular particles.
To evaluate the accuracy and limitations of the proposed shadow Doppler technique.

Main Methods:

Utilizing the output from a linear diode array within a modified laser Doppler velocimeter.
Employing the shadow Doppler technique to analyze particle trajectories and dimensions.

Main Results:

Achieved sizing accuracy better than 10% for transparent and opaque particles (30–140 µm).
Inaccuracy due to particle trajectory angles (< 24°) was < +5%.
Inaccuracy due to defocusing (±500 µm) was < +5%.

Conclusions:

The shadow Doppler technique provides accurate size and shape measurements for irregular particles.
This method offers superior robustness, lower alignment sensitivity, and cost-effectiveness compared to amplitude systems.
The technique is suitable for analyzing particles within a specific size range and under defined optical conditions.