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Related Experiment Videos

Bidirectional reflectance capabilities of the NIST Robotic Optical Scattering Instrument.

Heather J Patrick, Catherine C Cooksey, Thomas A Germer

    Applied Optics
    |October 6, 2021
    PubMed
    Summary

    The National Institute of Standards and Technology (NIST) Robotic Optical Scattering Instrument (ROSI) is a new reference instrument for precise bidirectional reflectance measurements. ROSI validates NIST's reflectance scale across UV to SWIR wavelengths.

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    Area of Science:

    • Optical physics
    • Metrology
    • Instrument science

    Background:

    • Accurate bidirectional reflectance measurements are crucial for various applications, including remote sensing and material characterization.
    • Existing reference instruments have limitations in wavelength coverage and measurement flexibility.
    • The National Institute of Standards and Technology (NIST) requires a state-of-the-art instrument for maintaining the national reflectance scale.

    Purpose of the Study:

    • To provide a comprehensive overview of the design, operation, and capabilities of the NIST Robotic Optical Scattering Instrument (ROSI).
    • To detail the measurement methodologies for both specular and diffuse bidirectional reflectance.
    • To establish and validate the new reflectance scale using ROSI.

    Main Methods:

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  • Detailed description of the ROSI instrument's design and operational principles.
  • Methodology for diffuse and specular reflectance measurements in the UV to SWIR regions.
  • Uncertainty budget analysis and validation against the previous reference instrument (STARR).

    • Main Results:

    • ROSI successfully serves as the national reference instrument for bidirectional reflectance.
    • Quantification of uncertainty components for ROSI measurements.
    • Validation of the reflectance scale, demonstrating consistency with previous measurements.
    • Demonstration of ROSI's capability for low-reflectance measurements and out-of-plane measurements.

    Conclusions:

    • ROSI is a robust and versatile instrument for bidirectional reflectance measurements.
    • The instrument enables high-accuracy measurements across a broad spectral range.
    • ROSI advances NIST's capabilities in optical metrology and supports applications in remote sensing and material science.