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 TOOLS & INSTRUMENTS

Normal incidence Diffuse Optical Scatter Instrument (NDOSI)
    
  Summary

The Normal incidence Diffuse Optical Scatter Instrument (NDOSI) is a new facility for measuring the hemispherical reflectance and transmittance of materials under direct and diffuse illumination in the visible range (400 nm to 800 nm). The measured quantities are used to investigate the diffuse optical properties of materials; these parameters are critical for understanding the interaction of light with optically diffusive materials.

NDOSI will provide calibration reference materials, solid and liquid tissue mimicking phantoms, measurements of scattering, absorption, reflectance, and transmittance of materials such as tissues, plant leaves, suspended solids and plankton for databases, model validation, and scales (e.g., turbidity).

Specifications/Capabilities
      
                          NDOSI
Normal incidence Diffuse Optical Scatter Instrument (NDOSI)NDOSI is designed to be NIST’s national reference instrument dedicated to the measurement of the diffuse optical properties of samples at room temperature. Three laser lines and a laser-driven broadband light source can be alternatively used to illuminate a sample placed adjacent to an integrating sphere to measure the sample’s hemispherical reflectance and transmittance. A custom model-based analysis program has been developed to determine the optical coefficients and the associated uncertainties. The sample can either be solid or liquid (contained in a dedicated liquid cell).

Major Accomplishments

Integration of a laser driven xenon light source
	Demonstration of hemispherical measurements of reflectance and transmittance under direct and diffuse illumination
	Comparison of the results with other NIST reference instrumentsNDOSI schematic
Schematic for NDOSI
                  Greenhouse gas measurements, Metrology and Optical physics and communications
  
            Organizations
      
      NIST HeadquartersLaboratory ProgramsPhysical Measurement LaboratorySensor Science DivisionRemote Sensing Group
              Details
          Campus
                    Gaithersburg
              Contact
      
        

NIST Staff
        David W. Allen
    
      
  david.allen@nist.gov
  (301) 975-3680

  Aaron M. Goldfain
    
      
  aaron.goldfain@nist.gov
  (301) 975-2338

  Jeeseong C. Hwang
    
      
  jeeseong.hwang@nist.gov
  (303) 497-6588
                      Related Publications
      
                  Correction of an adding-doubling inversion algorithm for the measurement of the optical parameters of turbid media
                                        Broadband spectral measurements of diffuse optical properties by an integrating sphere instrument at the National Institute of Standards and Technology
                                        Polydimethylsiloxane tissue-mimicking phantoms for quantitative optical medical imaging standards
                                        National Institute of Standards and Technology measurement service of the optical properties of biomedical phantoms: Current status
                                        Double-integrating-sphere system at the National Institute of Standards and Technology in support of measurement standards for the determination of optical properties of tissue-mimicking phantoms
                                        Development of traceable measurement of the diffuse optical properties of solid reference standards for biomedical optics at the National Institute of Standards and Technology
                                        Measurement of the optical properties of solid biomedical phantoms at the National Institute of Standards and Technology

    
    Created April 8, 2021
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