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Updated: Jun 15, 2026

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

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Polar nephelometer for atmospheric particulate studies.

M Z Hansen, W H Evans

|March 18, 2010

Summary

A novel polar nephelometer measures atmospheric particles by analyzing light scattering patterns. This helps determine particle properties crucial for understanding atmospheric radiative transfer.

Area of Science:

Atmospheric Science
Optical Physics

Background:

Atmospheric particulate matter significantly influences Earth's radiative balance.
Accurate characterization of particle optical properties is essential for climate modeling.

Purpose of the Study:

To design and construct a unique polar nephelometer for detailed atmospheric particulate analysis.
To derive the particulate scattering matrix for improved understanding of particle properties.

Main Methods:

Utilized a self-contained laser to irradiate air samples within the instrument.
Measured light scattering as a function of scattering angle for four incident light polarizations.
Determined the particulate scattering matrix based on scattered light detection.

Main Results:

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The instrument successfully measured light scattering from atmospheric particulates and molecules.
The derived scattering matrix provides information on particle size, shape, and refractive index.
The nephelometer's sensitivity range targets particles critical for visible radiative transfer.

Conclusions:

The developed polar nephelometer is effective for characterizing atmospheric particles.
The derived particulate scattering matrix enhances understanding of aerosol impacts on radiative transfer.
This technology offers a valuable tool for atmospheric research and climate studies.