10 June 2014 Quantitative total and diffuse reflectance laboratory measurements for remote, standoff, and point sensing
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Abstract
Methods for making total and diffuse directional/hemispherical reflectance measurements in the shortwave to longwave infrared using an integrating sphere are described. The sphere is a commercial, off-the-shelf optical device with its sample port at the bottom, which is essential for examining powdered samples without using a cover glass. The reflectance spectra of recently-developed National Institute of Standards and Technology (NIST, USA) infrared reflectance standards have been measured using the sphere. Reflectance spectra of other materials such as Spectralon and Infragold were also measured. The relative systematic error for the total reflectance measurements is estimated to be on the order of 3%, and random measurement error for multiple samples of each material is on the order of 0.5%.
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Thomas A. Blake, Thomas A. Blake, Timothy J. Johnson, Timothy J. Johnson, Russell G. Tonkyn, Russell G. Tonkyn, Brenda M. Forland, Brenda M. Forland, Tanya L. Myers, Tanya L. Myers, Carolyn S. Brauer, Carolyn S. Brauer, Yin-Fong Su, Yin-Fong Su, } "Quantitative total and diffuse reflectance laboratory measurements for remote, standoff, and point sensing", Proc. SPIE 9073, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XV, 907303 (10 June 2014); doi: 10.1117/12.2054116; https://doi.org/10.1117/12.2054116
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