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Proceedings Paper

Angle-dependent absolute infrared reflectance and transmittance measurements
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Paper Abstract

A goniometric system is used in conjunction with an FT-IR (Fourier- Transform Infrared) spectrophotometer to perform reflectance and transmittance measurements as a function of angle of incidence from 12$DEG to 80$DEG. The input beam is polarized using a high-quality Ge reflective Brewster-angle polarizer, and is focussed onto the sample with an approximately f/50 geometry. The average angle of incidence is controlled to within +/- 0.05$DEG, and spectra are recorded for both s- and p-polarization over a wavelength range of 1.6 (mu) m to 5.2 (mu) m, using a photoconductive InSb detector. Measurement results are compared to the predictions of the Fresnel equations in order to assess the accuracy of the instrument.

Paper Details

Date Published: 11 October 2000
PDF: 10 pages
Proc. SPIE 4103, Optical Diagnostic Methods for Inorganic Materials II, (11 October 2000); doi: 10.1117/12.403573
Show Author Affiliations
Simon G. Kaplan, National Institute of Standards and Technology (United States)
Leonard M. Hanssen, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 4103:
Optical Diagnostic Methods for Inorganic Materials II
Leonard M. Hanssen, Editor(s)

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