ASTM-E1791 › Standard Practice for Transfer Standards for Reflectance Factor for Near-Infrared Instruments Using Hemispherical Geometry
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1.1 This practice covers procedures for the preparation and use of acceptable transfer standards for NIR spectrophotometers. Procedures for calibrating the reflectance factor of materials on an absolute basis are contained in CIE Publication No. 44 (9). Both the pressed powder samples and the sintered PTFE materials are used as transfer standards for such calibrations because they have very stable reflectance factors that are nearly constant with wavelength and because the distribution of flux resembles closely that from the perfect reflecting diffuser.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
hemispherical optical measurement system; integrating sphere; materials standards; reflectance and reflectivity; transfer standards; ICS Number Code 37.020 (Optical equipment)
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37.020 (Optical equipment Including microscopes, telescopes, binoculars, optical materials, optical components and optical systems Ophthalmic equipment, see 11.040.70 Optical measuring instruments, see 17.180.30 Photographic equipment lenses, see 37.040.10)
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1996 R14 EDITION
June 15, 2014