Abstract

The object of this paper is to present results of several experiments relating to the preparation and use of pressed polytetrafluoroethylene (PTFE) powder as a diffuse reflectance standard for the 200–2500-nm spectral range. These experiments include two round-robin intercomparisons involving nine laboratories. These round-robin experiments provided data on the variability of the reflectance of pressed PTFE reflectance standards prepared in different laboratories. Results of these measurements provided insight into the problems associated with the PTFE standards and helped to establish what practices needed to be standardized to improve interlaboratory agreement for diffuse reflectance measurements.

© 1985 Optical Society of America

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References

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  1. F. Grum, M. Saltzman, P-75-77 New White Standard of Reflectance, CIE Publication 36, (Paris, 1976), p. 91.
  2. V. R. Weidner, J. J. Hsia, “Reflection Properties of Pressed Polytetrafluoroethylene Powder,” J. Opt. Soc. Am. 71, 856 (1981).
    [CrossRef]
  3. E. Schatz, “Effects of Pressure on the Reflectance of Compacted Powders,” J. Opt. Soc. Am. 56, 389 (1966).
    [CrossRef]
  4. W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
    [CrossRef]
  5. D. G. Goebel, B. P. Caldwell, H. K. Hammond, “Use of an Auxiliary Sphere with a Spectroreflectometer to Obtain Absolute Reflectance,” J. Opt. Soc. Am. 56, 783 (1966).
    [CrossRef]

1981 (1)

1977 (1)

W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
[CrossRef]

1966 (2)

Caldwell, B. P.

Goebel, D. G.

Grum, F.

F. Grum, M. Saltzman, P-75-77 New White Standard of Reflectance, CIE Publication 36, (Paris, 1976), p. 91.

Hammond, H. K.

Hsia, J. J.

V. R. Weidner, J. J. Hsia, “Reflection Properties of Pressed Polytetrafluoroethylene Powder,” J. Opt. Soc. Am. 71, 856 (1981).
[CrossRef]

W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
[CrossRef]

Saltzman, M.

F. Grum, M. Saltzman, P-75-77 New White Standard of Reflectance, CIE Publication 36, (Paris, 1976), p. 91.

Schatz, E.

Venable, W. H.

W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
[CrossRef]

Weidner, V. R.

V. R. Weidner, J. J. Hsia, “Reflection Properties of Pressed Polytetrafluoroethylene Powder,” J. Opt. Soc. Am. 71, 856 (1981).
[CrossRef]

W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
[CrossRef]

J. Opt. Soc. Am. (3)

J. Res. Natl. Bur. Stand. (1)

W. H. Venable, J. J. Hsia, V. R. Weidner, “Establishing a Scale of Directional-Hemispherical Reflectance Factor I: The Van den Akker Method,” J. Res. Natl. Bur. Stand. 82, 29 (1977).
[CrossRef]

Other (1)

F. Grum, M. Saltzman, P-75-77 New White Standard of Reflectance, CIE Publication 36, (Paris, 1976), p. 91.

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Figures (2)

Figure 1
Figure 1

Measured diffuse reflectance of a pressed PTFE powder specimen is influenced by varying the spacing between the plane of the specimen and the plane of the integrating sphere port. The effect is shown for measurements at 300, 550, and 1800 nm.

Fig. 2
Fig. 2

Powder press is designed to provide a means for controlling the density of pressed PTFE diffuse reflectance standards. The preferred density is 1 g/cm3.

Tables (4)

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Table I Round-Robin 1; Spectral Reflectance of Pressed PTFE Powder

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Table II Round Robin 2; Spectral Reflectance of Presssed PTFE Powder

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Table III Differences in Spectral Reflectance of PTFE Obtained from Manufacturers A and B

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Table IV Standard Deviation for Three Independent Determinations of the 6°/Hemisphertcal Reflectance Factor of Pressed PTFE Powder by the Double-Sphere Technique for Measuring Absolute Reflectance

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