Bidirectional reflectance capabilities of the NIST Robotic Optical Scattering Instrument

The National Institute of Standards and Technology (NIST) Robotic Optical Scattering Instrument (ROSI) serves as the national reference instrument for specular and diffuse bidirectional reflectance measurements in the ultraviolet to short-wave infrared wavelength regions. This paper gives a comprehe...

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Bibliographic Details
Published in:Applied optics 2021-10, Vol.60 (28), p.8774-8786
Main Authors: Patrick, Heather J, Cooksey, Catherine C, Germer, Thomas A, Nadal, Maria E, Zarobila, Clarence J
Format: Article
Language:English
Subjects:
Bidirectional reflectance
Measurement methods
Reflectometers
Reflectors
Remote sensing
Scattering
Short wave radiation
Ultraviolet reflection
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Description
Summary:The National Institute of Standards and Technology (NIST) Robotic Optical Scattering Instrument (ROSI) serves as the national reference instrument for specular and diffuse bidirectional reflectance measurements in the ultraviolet to short-wave infrared wavelength regions. This paper gives a comprehensive overview of the design, operation, and capabilities of ROSI. We describe measurement methods for diffuse and specular reflectance, identify and quantify the elements of the uncertainty budget, and validate the reflectance scale through comparison with NIST's previous reference instrument, the Spectral Tri-function Automated Reference Reflectometer. Examples of the range of ROSI's capabilities, including the limits for low-reflectance measurements and a research application using out-of-plane measurements of bidirectional reflectance for remote sensing reference reflectors, are also covered.
ISSN:1559-128X
2155-3165
1539-4522
DOI:10.1364/AO.435117