Abstract

A simplified curve-shape indexing system for spectrophotometric absorption curves is described by means of which the tentative identification of an “unknown” (whose curve is already at hand) may ordinarily be made in 2 or 3 minutes even in the presence of small amounts of colored impurities. Quantitative solutions are not required.

© 1942 Optical Society of America

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References

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  1. W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).
  2. I. H. Godlove, paper in the Intersociety Color Council News Letter 26 (December, 1939).
  3. W. P. Davey, J. App. Phys. 10, 8207–830 (1939).
    [CrossRef]
  4. Construction of cams providing log log 1/T plots is described in U. S. Patent2,176,013.
  5. E. Zühlke, Analyze von Färbungen (Janecke).

1939 (2)

I. H. Godlove, paper in the Intersociety Color Council News Letter 26 (December, 1939).

W. P. Davey, J. App. Phys. 10, 8207–830 (1939).
[CrossRef]

1932 (1)

W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).

Davey, W. P.

W. P. Davey, J. App. Phys. 10, 8207–830 (1939).
[CrossRef]

Godlove, I. H.

I. H. Godlove, paper in the Intersociety Color Council News Letter 26 (December, 1939).

Holmes, W. C.

W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).

Peterson, A. R.

W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).

Scanlan, J. T.

W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).

Zühlke, E.

E. Zühlke, Analyze von Färbungen (Janecke).

Dept. Agriculture Tech. Bull. (1)

W. C. Holmes, J. T. Scanlan, and A. R. Peterson, “The visual spectrophotometry of dyes,” Dept. Agriculture Tech. Bull. 310 (June, 1932).

J. App. Phys. (1)

W. P. Davey, J. App. Phys. 10, 8207–830 (1939).
[CrossRef]

paper in the Intersociety Color Council News Letter (1)

I. H. Godlove, paper in the Intersociety Color Council News Letter 26 (December, 1939).

Other (2)

Construction of cams providing log log 1/T plots is described in U. S. Patent2,176,013.

E. Zühlke, Analyze von Färbungen (Janecke).

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Figures (2)

F. 1
F. 1

Form for use in reading off the curve shape symbols. Symbol for illustrative curve is: 1, 58, 63, 53. (Abscissa is linear in log wave-length; ordinate is linear in log log 1/T).

F. 2
F. 2

Analysis of two-component mixture. The experimental curve A is roughly “separated” into the component curves B and C, for each of which a separate identification is attempted.

Tables (1)

Tables Icon

Table I Illustrative section from curve shape index (spectral range: 400 to 700 mμ; solvent: water, pH 7).