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Proceedings Article

Measuring grazing-angle DHR with the infrared grazing angle reflectometer

[+] Author Affiliations
Michael R. Benson, Michael A. Marciniak

Air Force Institute of Technology (United States)

Jeffrey W. Burks

Air Force Research Lab. (United States)

Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 84950R (October 15, 2012); doi:10.1117/12.931512
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From Conference Volume 8495

  • Reflection, Scattering, and Diffraction from Surfaces III
  • Leonard M. Hanssen
  • San Diego, California, USA | August 12, 2012

abstract

The Infrared Grazing Angle Reflectometer allows measurement of Directional Hemispherical Reflectance (DHR) at very high angles of incidence (30 to 85 degrees) and at wavelengths ranging from 4.3 to 10.8 microns. A hemi-ellipsoidal mirror redirects the reflected light and reflects it on to a novel five-sided pyroelectric detector. The incident light intensity is measured and used in calculating the DHR of the sample. In this paper, the theory of operation of this detector is derived, and used to simulate the operation of the system. This simulation of the detector shows errors of 3% or less for both diffuse and specular samples, compared to the theoretical DHR. The calibration method defined in this paper allows for high accuracy and ease of use without knowing the specific attributes of the optics used in the system. Finally, collected DHR data is compared with the simulated data for comparison. Comparing the measured data to the simulation shows that the model correctly predicts the locations and trends of the scattered energy. © (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Michael R. Benson ; Michael A. Marciniak and Jeffrey W. Burks
" Measuring grazing-angle DHR with the infrared grazing angle reflectometer ", Proc. SPIE 8495, Reflection, Scattering, and Diffraction from Surfaces III, 84950R (October 15, 2012); doi:10.1117/12.931512; http://dx.doi.org/10.1117/12.931512


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