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Rayleigh scattering limits for low-level bidirectional reflectance distribution function measurements.

C Asmail, J Hsia, A Parr

|October 12, 2010

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This study estimates the Rayleigh limit in bidirectional reflectance distribution function (BRDF) measurements caused by light scattering in gases. Reducing this limit involves using longer wavelengths and less refractive media.

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Area of Science:

Optical physics
Atmospheric optics
Spectroscopy

Background:

Bidirectional Reflectance Distribution Function (BRDF) measurements are crucial for surface characterization.
Atmospheric scattering can introduce limitations in optical measurements.
Rayleigh scattering theory explains light scattering by particles much smaller than the wavelength of light.

Purpose of the Study:

To estimate the Rayleigh limit in BRDF measurements due to atmospheric scattering.
To investigate methods for reducing this limit, such as altering wavelength and medium properties.
To derive an expression for equivalent BRDF caused by gas molecule scattering.

Main Methods:

Utilized Rayleigh scattering theory to derive an equivalent BRDF expression for gas scattering.
Designed and described specific instrumentation for experimental measurements.
Conducted experiments using clear air, nitrogen, and helium gases.

Main Results:

Quantified the Rayleigh limit in BRDF measurements under laboratory conditions.
Observed trends confirming that longer wavelengths and media with lower refractive indices reduce the scattering limit.
Experimental data validated the theoretical predictions for gas scattering effects.

Conclusions:

The Rayleigh limit in BRDF measurements is significantly influenced by the optical path medium and wavelength.
Strategies involving medium selection and wavelength control can mitigate scattering-induced errors.
This research provides a framework for improving the accuracy of optical measurements in scattering media.