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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 35, Iss. 4 — Apr. 1, 1945
  • pp: 289–292

Illuminating and Viewing Conditions for Spectrophotometry and Colorimetry

ARTHUR C. HARDY  »View Author Affiliations

JOSA, Vol. 35, Issue 4, pp. 289-292 (1945)

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ARTHUR C. HARDY, "Illuminating and Viewing Conditions for Spectrophotometry and Colorimetry," J. Opt. Soc. Am. 35, 289-292 (1945)

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  1. The text of this resolution is as follows: "Dans la mésure colorimétrique des matériaux réfléchissants, excepté dans le cas où des circonstances particulières indiquent qu'il en doit être autrement, la lumière incidente doit faire un angle de 45° avec le normale et la direction d'observation doit être normale à la surface de l'échantillon."
  2. Arthur C. Hardy, J. Opt. Soc. Am. 25, 305 (1935).
  3. The reflectance of a matte surface produced by grinding is usually higher than the reflectance of an etched surface, because of the debris that is forced into the interstices of the surface during the grinding. This debris consists of abrasive mixed with a large quantity of powdered glass, which is always white regardless of the original color of the glass. Thus the reflectance of a ground surface of black glass is decreased from more than 10 percent to approximately 4 percent by subsequent etching.
  4. Final report of the O.S.A. Sub-Committee on the Spacing of the Munsell Colors, J. Opt. Soc. Am. 33, 385 (1943).
  5. Arthur C. Hardy, J. Opt. Soc. Am. and Rev. Sci. Inst. 18, 96 (1929).
  6. Of more serious consequence, when judged by present standards of accuracy, is the apparent variation in spectral reflectance produced by slight variations in the position of the sample. In the case of the 0°–45° instrument, merely removing a textile sample from the sample-holder and then replacing it for remeasurement usually changed the geometry significantly. This sensitivity to changes in geometry is at a maximum in the case of unidirectional light and vanishes when the light is diffuse.
  7. J. A. Leermakers, J. Chem. Phys. 5, 889 (1937).

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