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Standard Reference Materials: White Opal Glass Diffuse Spectral Reflectance Standards for the Visible Spectrum (SRM's 2015 and 2016)

机译:标准参考材料:可见光谱的白色蛋白石玻璃漫反射光谱反射标准(sRm 2015和2016)

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Vitrolite white opal glass has been calibrated for use as diffuse spectral reflectance standards since 1944. Its uniformity and long-term durability make it useful as an everyday working standard for spectrophotometric measurements in the visible spectral range. However, its translucency can introduce some errors in such measurements if improperly used. Prior to 1965 the Vitrolite reflectance standards were issued with diffuse reflectance values relative to freshly smoked magnesium oxide. Since that date the calibration of these standards is reported on an absolute reflectance scale or one which is relative to a perfect diffuser. Since the completion of the NBS Reference Spectrophotometer for diffuse reflectance measurements in 1975, work on the perfection of techniques for determining a more accurate absolute reflectance scale has made it possible to further improve these measurements. As a result of this effort, the Vitrolite reflectance standards are now more accurately characterized and are being issued as a Standard Reference Material.

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