Bidirectional reflection effects in practical integrating spheres

Integrating spheres play a central role in radiometric instrument calibration, surface optical property measurement, and radiant source characterization. Our work involves a simulation, based on the Monte Carlo ray-trace (MCRT) of bidirectional reflections within a practical integrating sphere pierc...

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Bibliographic Details
Published in:Applied optics (2004) 2015-10, Vol.54 (30), p.8951-8956
Main Authors: Mahan, J R, Walker, J A, Stancil, M M
Format: Article
Language:English
Subjects:
Absorptivity
Bidirectional
Calibration
Computer simulation
Integrating spheres
Reflection
Spectra
Walls
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Summary:Integrating spheres play a central role in radiometric instrument calibration, surface optical property measurement, and radiant source characterization. Our work involves a simulation, based on the Monte Carlo ray-trace (MCRT) of bidirectional reflections within a practical integrating sphere pierced with two viewing ports. We used data from the literature to create an empirical model for the bidirectional reflection distribution function (BRF) of Spectralon suitable for use in the MCRT environment. The ratio of power escaping through the two openings is shown to vary linearly with wall absorptivity for both diffuse and bidirectional reflections. The sensitivity of this ratio to absorptivity is shown to be less when reflections are weakly bidirectional.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.54.008951