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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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ESTABLISHING BRDF CALIBRATION CAPABILITIES THROUGH SHORTWAVE INFRARED.

Georgi T Georgiev1, James J Butler2, Kurt Thome2

  • 1NASA Langley Research Center, Hampton, VA23666.

Proceedings of Spie--The International Society for Optical Engineering
|November 24, 2017
PubMed
Summary

Accurate calibration of satellite instruments relies on precise Bidirectional Reflectance Distribution Function (BRDF) measurements. This study compares BRDF data for Spectralon diffusers, achieving low uncertainty for improved remote sensing mission calibration.

Keywords:
BRDFCalibrationJPSSRBIReflectanceRemote Sensing

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Area of Science:

  • Remote Sensing
  • Optical Engineering
  • Materials Science

Background:

  • Satellite instruments require precise calibration using diffusers with known Bidirectional Reflectance Distribution Functions (BRDFs).
  • Spectralon is a common material for these diffusers in both laboratory and on-orbit applications.
  • Accurate BRDF determination is crucial for the calibration of instruments like the Radiation Budget Instrument (RBI) and Visible Infrared Imaging Radiometer Suit (VIIRS).

Purpose of the Study:

  • To compare spectral Bidirectional Reflectance Distribution Function (BRDF) and Directional Hemispherical Reflectance (DHR) of Spectralon.
  • To validate new BRDF measurement capabilities at NASA Goddard Space Flight Center (GSFC) in the shortwave infrared (SWIR) range.
  • To support the calibration of current and future NASA remote sensing missions.

Main Methods:

  • A new BRDF measurement setup was developed at NASA GSFC for the 900 nm to 2500 nm range.
  • The setup utilizes an indium gallium arsenide detector, bandpass filters, and a supercontinuum light source.
  • Comparisons were made with National Institute of Standards and Technology (NIST) Spectral Tri-function Automated Reference Reflectometer (STARR) data for a Spectralon (PTFE) target.

Main Results:

  • The new GSFC scatterometer achieved a total combined uncertainty of less than 1% (k=1) for SWIR BRDF measurements.
  • Comparisons between GSFC and NIST measurements demonstrated consistency in BRDF data.
  • Measurements were conducted at specific incident (0°) and viewing (45°) angles.

Conclusions:

  • The new GSFC BRDF measurement setup is validated and capable of providing accurate data for satellite instrument calibration.
  • The study supports the calibration efforts for Joint Polar Satellite System (JPSS) instruments and other NASA remote sensing missions.
  • Precise BRDF characterization of diffusers like Spectralon is essential for reliable remote sensing data.