References and Notes
- IES Committee on Testing Procedures, “IES Approved Method of Reflectometry,” IES LM-44– 1973, J. Illum. Eng. Soc., Vol. 3, No. 2, p. 167, Jan. 1974.
- IES Nomenclature Committee, American National Standard Nomenclature and Definitions for Illuminating Engineering, ANSI/IES RP-16–1986, New York: Illuminating Engineering Society of North America, 1986, Section 7.3.3.
- Ibid., Sections 3.10.1 and 3.10.2.
- Ibid., Section 7.6.
- The British Paint Institute, Waldergrave Road, Teddington, Middlesex, England, used a 0/45 reflectance factor and can supply current information on this method.
- Federal Test Method Standard 370, “Instrumental Photometric Measurements of Retroreflective Materials and Retroreflective Devices.” General Services Administration, Specification and Consumer Information Distribution Branch, Building 197, Washington Naval Yard, Washington, DC 20407.
- GrumF. and BechererR.J., Optical Radiation Measurements, Volume I, Radiometry, New York: Academic Press, 1979, Section 10.5.4.
- GrumF. and LuckeyG.W., Applied Optics, Vol. 2, p. 2289.
- No. 6082 Eastman White Reflectance Kit including calibrated BaSO4, lucite holders, and a glass plate are available from Eastman Kodak Company, Rochester, NY 14650
- Secondary standards of porcelain enamel may be obtained from the Gardner Laboratory, Inc., 5521 Landy Lane, P.O. Box 5728, Bethesda, MD 20014; or the Hunter Associates Laboratory, Inc., D529 Lee Highway, Fairfax, VA22030. Experience has shown that these secondary standards are reasonably permanent if abrasion is avoided. Before use, always wash this type of standard with mild soluble soap and water, rinse, and dry with a clean towel. Handle them carefully to avoid abrading the surface.
- In general, instrumental errors are related to the difference in reflectance factor and spectra characteristics between specimen and standard. For greatest accuracy, standards close in reflectance factor and similar in spectral characteristics to the specimen, should be used. The same area of standard should be measured as that used for its calibration.