Infrared Optical Properties of Materials |
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Accurate measurements of the optical properties of materials in the infrared spectral range play an increasingly important role in the aerospace and defense industries, optical engineering, condensed matter physics, remote sensing, radiative heat transfer measurements and related areas. The laboratory for infrared optical properties measurements has established high accuracy infrared reflectance and transmittance capabilities for wavelengths between 1 µm and 18 µm. Near normal absolute spectral reflectance and transmittance of both specular and diffuse samples can be measured from near ambient to 200 °C using a custom integrating sphere and Fourier transform (FT) spectrometer. Additional capabilities for specular samples include transmittance down to 10 K using an optical cryostat, as well as variable angle transmittance and reflectance using a custom goniometer and polarizers. Special test measurements are performed for both NIST and external customers in government and industry on a wide variety of materials including mirrors, filters, windows, coatings and cavity structures. Emittance and absorptance are obtained indirectly through combining the reflectance and transmittance under identical conditions. Also, a newly developed facility is available for the measurement of directional spectral emittance for sample temperature up to 1000 °C, accomplished through comparison of radiance with reference blackbody sources. This new facility supplements and extends the overall optical properties effort to be more comprehensive in meeting the customers' needs and providing the highest accuracy data.
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For technical information or questions, call: |
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Phone: 301-975-2344 |
Phone: 301-975-2336 |
Fax: 301-869-5700 |
Fax: 301-869-5700 |
E-mail: leonard.hanssen@nist.gov |
E-mail: simon.kaplan@nist.gov |