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$Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene$

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Full-field diffraction particle sizing.

M A Coil, P V Farrell

|November 10, 2010

Summary

A new particle-sizing technique analyzes far-field diffraction patterns from images to determine particle size distributions. This method provides spatially resolved data, effective even for dense particle groups in transient sprays.

Area of Science:

Optical Engineering
Fluid Dynamics
Particle Analysis

Background:

Accurate particle size measurement is crucial for understanding spray dynamics.
Existing techniques may struggle with dense or transient particle fields.
Far-field diffraction offers a potential avenue for non-intrusive particle sizing.

Purpose of the Study:

To develop and validate a novel particle-sizing technique based on far-field diffraction.
To assess the technique's capability for spatially resolved measurements.
To demonstrate the technique's application in analyzing complex spray phenomena.

Main Methods:

Image acquisition of particles to capture diffraction patterns.
Interrogation of captured images to extract diffraction data.

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Inversion of diffraction data to reconstruct particle-size distributions.

Main Results:

Successful retrieval of particle-size distributions from diffraction patterns.
Demonstration of spatially resolved size information acquisition.
Effective performance in dense particle fields and transient diesel sprays.

Conclusions:

The developed technique accurately determines particle sizes using far-field diffraction.
Spatially resolved data is achievable, beneficial for transient spray analysis.
The method shows promise for studying complex fluid dynamics, such as diesel sprays.