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TOOLS & INSTRUMENTS

# Robotic Optical Scattering Instrument (ROSI)

ROSI (Robotic Optical Scattering Instrument)

ROSI performs specular and bidirectional reflectance measurements of spectrally neutral, non-fluorescent specular and diffuse samples at room temperature. It serves as the national reference instrument for specular and bidirectional reflectance measurements. The national reference instrument for directional-hemispherical reflectance measurements is the Reference Integrating Sphere for Spectral Reflectance.

ROSI uses a quasi-monochromatic system for illumination of the sample and broadband detection for the reflected radiation. Sample angles and positioning are controlled by a robotic-arm-based goniometer. Specular and bidirectional calibrations are collected in-plane, meaning the sample normal, illumination axis, and receiver axis are in the same plane. ROSI can also perform out-of-plane bidirectional reflectance measurements for research and special tests.

## Video

## Specifications/Capabilities

Conditions for specular and bidirectional reflectance measurements using ROSI

Optical / photometry / laser metrologyOptical physics and communications

## Organizations

                          - NIST Headquarters
                            - Laboratory Programs
                              - Physical Measurement Laboratory
                                - Sensor Science Division
                                  - Surface and Interface Metrology Group

## Details

## Contact

                    -  Heather Patrick  heather.patrick@nist.gov      (301) 975-4684   
                    -  Catherine Cooksey  catherine.cooksey@nist.gov      (301) 975-6208   

## Related Projects

Spectrophotometry

Building the next generation reference reflectometer

Spectral Reflectance and Transmittance

## Related Publications

Spectral Reflectance

Bidirectional reflectance capabilities of the NIST Robotic Optical Scattering Instrument (ROSI)

### HEADQUARTERS

301-975-2000

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