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 TOOLS & INSTRUMENTS

Reference Integrating Sphere for Spectral Reflectance
    
  reference integrating sphere
  
      The reference integrating sphere performs directional-hemispherical reflectance measurements of spectrally neutral, non-fluorescent samples at room temperature. It serves as the national reference instrument for directional-hemispherical reflectance measurements. The sphere uses a tunable, quasi-monochromatic system for illumination of the sample that is shared with the Robotic Optical Scattering Instrument (ROSI) and broadband detection. Directional-hemispherical measurements are made relative to a calibrated standard, pressed polytetrafluoroethylene (PTFE).

Specifications/Capabilities
      
                          Conditions for directional/hemispherical reflectance measurements using the reference integrating sphere:

***Geometrical***Illumination Angle
			8° specular includedViewing Angle
			HemisphereSample size
			Minimum 45 mmSampling Aperture
			10 mm***Spectral***Wavelength
			250 nm to 2400 nmBandwidth
			14 nmPolarization
			Linear or unpolarized***Measurand***Quantity
			Reflectance FactorTechnique
			Relative to PTFERange
			0.001 to 1Relative uncertainty (*k*=2)*
			0.4%*The listed relative uncertainty is the minimum expected value. Actual values vary due to sample-dependent factors.
                  Metrology, Optical / photometry / laser metrology, Physics and Optical physics and communications
  
            Organizations
      
      NIST HeadquartersLaboratory ProgramsPhysical Measurement LaboratorySensor Science DivisionSurface and Interface Metrology Group
              Details
          Campus
                    Gaithersburg
              Contact
      
        

Heather Patrick
    
      
  heather.patrick@nist.gov
  (301) 975-4684
                      Related Tools & Instruments
      
                  Reference Transmittance Spectrophotometer (RTS)
                                        Transfer spectrophotometer
                                        Robotic Optical Scattering Instrument (ROSI)
  Related Projects
      
                  Spectrophotometry
                                        Spectral Reflectance and Transmittance

    
    Created January 31, 2023, Updated February 2, 2023
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