Abstract

If a suitable filter is placed in the sample beam of the recording spectrophotometer, the automatic tristimulus integrator may be used for calculations based on illuminants other than Illuminant C without a change in the cams. Instructions for making a filter for use in calculating tristimulus values based on an illuminant approximating Illuminant A are given.

© 1950 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. H. R. Davidson and L. W. Imm, J. Opt. Soc. Am. 39, 942 (1949).
    [Crossref]
  2. A. C. Hardy, Handbook of Colorimetry (Technology Press, Cambridge, Massachusetts, 1936).
  3. See reference 2, Table V.
  4. Polarization caused by the Cellophane is corrected on our spectrophotometer by means of a retardation plate. See G. L. Buc and E. I. Sterns, J. Opt. Soc. Am. 35, 458 (1945).
    [Crossref]

1949 (1)

1945 (1)

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (3)

Fig. 1
Fig. 1

Spectral transmission characteristics of conversion filters.

Fig. 2
Fig. 2

Position of illuminants in chromaticity diagram.

Fig. 3
Fig. 3

Relative distribution of energy in various illuminants.

Equations (6)

Equations on this page are rendered with MathJax. Learn more.

X C = E C x ¯ R d λ ;
X A = E A x ¯ R d λ .
w = E A / E C .
X A = w E C x ¯ R d λ = E C x ¯ ( w R ) d λ .
W = E A / 3 E c .
X A = 3 E c x ¯ ( W R ) d λ .