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Related Experiment Video

Updated: Aug 4, 2025

$Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction$

Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction

Published on: September 16, 2016

Interferometric laser imaging for respiratory droplets sizing.

Livia Grandoni^1,2,3, Loïc Méès⁴, Nathalie Grosjean⁴

¹Department of Civil, Building and Environmental Engineering, Faculty of Civil and Industrial Engineering, University of Rome La Sapienza, Piazzale Aldo Moro, 5, 00185 Rome, Italy.

Experiments in Fluids

|April 5, 2023

Summary

This summary is machine-generated.

Researchers measured the size and velocity of airborne particles expelled during speech using Interferometric Laser Imaging Droplet Sizing (ILIDS). This provides crucial data for understanding airborne disease transmission and improving respiratory cloud models.

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Last Updated: Aug 4, 2025

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Area of Science:

Aerosol science
Fluid dynamics
Public health

Background:

Airborne disease transmission, highlighted by the COVID-19 pandemic, necessitates understanding respiratory particle dispersion.
Current knowledge gaps exist regarding particle velocity, which can differ from air velocity and vary by particle size.

Purpose of the Study:

To simultaneously measure the size and velocity of particles emitted during human speech.
To quantify particle concentration and all three velocity vector components for particles down to 2 µm.

Main Methods:

Utilized Interferometric Laser Imaging Droplet Sizing (ILIDS) for simultaneous particle size and velocity measurements.
Applied ILIDS to particles generated during human speech activities.

Main Results:

Successfully measured particle size and velocity distributions for emitted particles.
Quantified three velocity components and particle concentration for particles as small as 2 µm.

Conclusions:

Provides essential data on particle velocity and size during speech, crucial for airborne transmission studies.
Findings can serve as boundary conditions for numerical simulations of respiratory cloud dispersion.