Abstract

This new instrument for measuring the color of cotton is based on a satisfactory application of the Hunter Color and Color-Difference Meter to problems of raw cotton measurement. It is designed to be fully automatic and self-standardizing, and graphically to show values for reflectance (Rd) and yellowness (+b) on a two-dimensional chart. It is self-contained in a movable cabinet, with a minimum of exposed parts. Although this particular model is limited to measurements in the range of cotton color, the principles on which it is designed are adaptable to other limited ranges of color, in either two or three dimensions, thus providing an automatic, self-standardizing small-difference colorimeter for other limited ranges of color.

© 1950 Optical Society of America

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References

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  1. D. Nickerson, Am. Dyestuff Reporter 21, 4 (1932); Fiber and Fabric 85, 11 (1932).
  2. D. Nickerson, Textile Research J. 16, 441 (1946).
    [Crossref]
  3. D. Nickerson, J. Opt. Soc. Am. 21, 640 (1931).
    [Crossref]
  4. D. Nickerson, J. Opt. Soc. Am. 21, 643 (1931).
    [Crossref]
  5. S. M. Newhall, D. Nickerson, and D. B. Judd, J. Opt. Soc. Am. 33, 385 (1943).
    [Crossref]
  6. R. W. Burnham, J. Opt. Soc. Am. 39, 387 (1949).
    [Crossref] [PubMed]
  7. D. Nickerson, J. Opt. Soc. Am. 40, 85 (1950).
    [Crossref]
  8. R. S. Hunter, J. Opt. Soc. Am. 38, 661(A) (1948).
  9. R. S. Hunter, J. Opt. Soc. Am. 38, 1094(A) (1948).

1950 (1)

1949 (1)

1948 (2)

R. S. Hunter, J. Opt. Soc. Am. 38, 661(A) (1948).

R. S. Hunter, J. Opt. Soc. Am. 38, 1094(A) (1948).

1946 (1)

D. Nickerson, Textile Research J. 16, 441 (1946).
[Crossref]

1943 (1)

1932 (1)

D. Nickerson, Am. Dyestuff Reporter 21, 4 (1932); Fiber and Fabric 85, 11 (1932).

1931 (2)

Am. Dyestuff Reporter (1)

D. Nickerson, Am. Dyestuff Reporter 21, 4 (1932); Fiber and Fabric 85, 11 (1932).

J. Opt. Soc. Am. (7)

Textile Research J. (1)

D. Nickerson, Textile Research J. 16, 441 (1946).
[Crossref]

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Figures (5)

Fig. 1
Fig. 1

Top of automatic cotton colorimeter.

Fig. 2
Fig. 2

Interior view of instrument, with numbers identifying components. 1, Sample area; 2, exposure head; 3, lamp guard; 4, Rd indicator; 5, b indicator; 6, Rd balancing motor; 7, Rd slide wire; 8, amplifier off-on switch; 9, lamps off-on switch; 10, b slide wire; 11, b amplifier; 12, relays; 13, CV transformer; 14, lamp for indicating scale; 15, comparison balancing motor; 16, b balancing motor.

Fig. 3
Fig. 3

Diagram of interior of exposure head, with numbers identifying components. 1, Sample area; 16, b balancing motor; 17, standard; 18, rotary solenoid; 19, mirror; 20, mirror; 21, photo-cells (one back, one front) blue filter; 22, photo-cell green filter; 23, photo-cell green filter; 24, micrometer adj. screw.

Fig. 4
Fig. 4

Simplified d.c. measuring circuit.

Fig. 5
Fig. 5

Pictorial diagram of switching of amplifier output when changing from standard to sample measurement.