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Measuring the Behavioral Effects of Intraocular Scatter

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Measurements of the skylight scattering function.

|May 22, 2010

Summary

A new handheld skylight photometer measures sky radiation near the sun. This instrument helps determine aerosol scattering functions and reveals the impact of water vapor on solar measurements.

Area of Science:

Atmospheric optics
Radiative transfer
Aerosol science

Background:

Accurate measurement of solar and sky radiation is crucial for understanding atmospheric processes.
Characterizing aerosol optical properties is essential for climate modeling and air quality assessments.
Existing instrumentation may have limitations in measuring radiation close to the sun.

Purpose of the Study:

To describe a novel, handheld skylight photometer integrated into a sun photometer.
To present calibration procedures for the instrument.
To demonstrate the utility of the instrument in measuring aerosol scattering functions and water vapor influence.

Main Methods:

Development and description of a small, handheld skylight photometer.

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Integration of the photometer into a sun photometer system.

Measurement of sky radiation within 2 degrees of the sun at 0.50 and 0.93 micrometers.

Application of derived formulas to obtain aerosol scattering functions.

Main Results:

The described photometer successfully measures sky radiation near the sun.
Solar measurements in the 0.93-micrometer channel clearly show the influence of water vapor.
Formulas for calculating aerosol scattering functions were developed and applied.
Comparison of measured and theoretical aerosol scattering functions was performed.

Conclusions:

The developed handheld skylight photometer is a valuable tool for atmospheric radiation studies.
The instrument effectively captures the impact of water vapor on solar radiation.
The methodology allows for the determination of aerosol scattering properties, contributing to atmospheric research.