The NIST Robotic Optical Scatter Instrument (ROSI) and its application to BRDF measurements of diffuse reflectance standards for remote sensing

Patrick, Heather J.; Zarobila, Clarence J.; Germer, Thomas A.

doi:10.1117/12.2023095

Cited by 18 publications

(17 citation statements)

References 4 publications

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“…Now that we have successfully demonstrated the capability to measure 0/45 reflectance factors beyond 1100 nm, NIST is developing the next-generation reflectometer, which will allow reflectance calibrations to be made at nearly any combination of incident and scattering angles over the full solar reflective region [17].…”

Section: Resultsmentioning

confidence: 99%

Establishment and application of the 0/45 reflectance factor scale over the shortwave infrared

et al. 2015

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This paper describes the establishment and application of the 0/45 reflectance factor scale in the shortwave infrared (SWIR) from 1100 to 2500 nm. Design, characterization, and the demonstration of a four-stage, extended indium-gallium-arsenide radiometer to perform reflectance measurements in the SWIR have been previously discussed. Here, we focus on the incorporation of the radiometer into the national reference reflectometer, its validation through comparison measurements, and the uncertainty budget. Next, this capability is applied to the measurement of three different diffuser materials. The 0/45 spectral reflectance factors for these materials are reported and compared to their respective 6/di spectral reflectance factors.

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Section: Resultsmentioning

confidence: 99%

Establishment and application of the 0/45 reflectance factor scale over the shortwave infrared

et al. 2015

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“…Since the measurements were taken only at a single angle of incidence for the excitation light and a single viewing plane, this does not offer a complete picture of the hemispherical reflectance and fluorescence angular emission. Measurements using the NIST Robotic Optical Scatter Instrument (ROSI) [7], a goniometer where any combination of angles of incidence and viewing is possible, are planned; this will require some modifications to the instrument for fluorescence detection.…”

Section: Discussion and Future Workmentioning

confidence: 99%

Lambertian nature of tissue phantoms for use as calibrators in near infrared fluorescence imaging

et al. 2016

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The use of tissue phantoms as calibrators to transfer SI-referenced scale to an imager offers convenience, compared to other methods of calibration. The tissue phantoms are calibrated separately for radiance at emission wavelength per irradiance at excitation wavelength. This calibration is only performed at a single geometric configuration, typically with the detector normal to the sample. In the clinic however, the imager can be moved around, resulting in a geometric configuration different from the calibration configuration. In this study, radiometric measurements are made at different sample-imager angles to test whether the tissue phantoms are Lambertian and the angular limits to which the calibration values hold true.

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“…This is also the measurement design used by NIST's Robotic Optical Scatter Instrument (ROSI) and ROSI's predecessors, STARR and STARR II [8], [41], [42], [43], [7]. The configuration of the measurement system in this research is highly adapted from the design of NIST's measurement system and is shown in Figure 3.…”

Section: Measurement Designmentioning

confidence: 99%

Experimental validation of the Generalized Harvey-Shack surface scatter theory

Nattinger

2020

Reflection, Scattering, and Diffraction From Surfaces VII

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Experimental Validation of the Generalized Harvey-Shack Surface Scatter Theory. The Generalized Harvey-Shack (GHS) surface scatter theory claims to predict the scatter from rough surfaces over a wide domain of validity but has not been widely implemented or tested. The focus of this research is to provide a documented implementation and experimental validation of the GHS theory for the prediction of the bidirectional reflectance distribution function (BRDF) from real rough surfaces. First, the GHS theory was developed for the MATLAB R software and the details of its implementation and application to experimental comparison are discussed. Next, a BRDF measurement system was designed, built, and validated. The BRDF of the Spectralon reflectance standard was measured with high agreement. Sample surfaces were characterized via atomic force microscopy as inputs to the GHS theory. The BRDF of each surface was then measured and simulated with the assumption of Gaussian autocovariance. When this assumption held, the GHS theory predictions matched well with experimental results.

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The NIST Robotic Optical Scatter Instrument (ROSI) and its application to BRDF measurements of diffuse reflectance standards for remote sensing

Cited by 18 publications

References 4 publications

Establishment and application of the 0/45 reflectance factor scale over the shortwave infrared

Establishment and application of the 0/45 reflectance factor scale over the shortwave infrared

Lambertian nature of tissue phantoms for use as calibrators in near infrared fluorescence imaging

Experimental validation of the Generalized Harvey-Shack surface scatter theory

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