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Bidirectional reflectance distribution function of gold-plated sandpaper.

T W Stuhlinger, E L Dereniak, F O Bartell

|March 25, 2010

Summary

Gold-plated sandpaper shows potential as a Lambertian reflector for infrared (IR) spectrum applications. Optimal grit sizes depend on wavelength, with particle density being more critical than roughness for Lambertian behavior.

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Area of Science:

Optical Engineering
Materials Science
Spectroscopy

Background:

Standard reference reflectors are crucial for accurate measurements in the infrared (IR) spectrum.
Traditional Lambertian reflectors have limitations in certain IR applications.
Investigating novel materials like gold-plated sandpaper for improved reflectivity.

Purpose of the Study:

To evaluate gold-plated sandpaper as a Lambertian standard reference reflector for the IR spectrum.
To determine the optimal sandpaper grit sizes and materials for different IR wavelengths.
To compare the performance of gold-plated sandpaper with existing IR reflectors.

Main Methods:

Studied various grit sizes (3-400 microm) and materials (silicon carbide, aluminum oxide) of gold-plated sandpaper.

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Measured scattering using three laser wavelengths (0.6328, 3.39, 10.6 microm) at multiple angles of incidence (0-60 degrees).

Analyzed the correlation between surface roughness, particle density (filling factor), and Lambertian behavior.

Main Results:

Identified optimal sandpaper: 9-microm Al2O3 for 0.6328/3.39 microm and 600-grit Armak Co. for 10.6 microm radiation.
Found particle density (filling factor) is more critical for Lambertian approximation than grit size.
Achieved good Lambertian approximations at small angles of incidence, but performance degraded at 60 degrees.

Conclusions:

Gold-plated sandpaper, specifically optimized grit sizes, can serve as a Lambertian reference reflector in the IR spectrum.
Particle packing density significantly influences the degree of Lambertian behavior.
The effectiveness of sandpaper reflectors is angle-dependent, performing best at lower incidence angles.