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References

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  1. F. M. Rowe, Society of Dyers and Colourists, Colour Index (Chorley and Pickersgill, Ltd., Leeds, 1924).
  2. R. E. Rose, Ind. Eng. Chem. 25, 1028 (1933) U. S. Patent1,674,128 (1928).
    [Crossref]
  3. C.I. indicates the color index number as given by Rowe.1
  4. Manufactured by American Cyanamid Company.
  5. Manufactured by Southern Pine Chemical Company.
  6. Manufactured by the Reichhold Chemical Company.
  7. C. F. Goodeve, Proc. Roy. Soc. A155, 644 (1936).
  8. W. E. Forsythe, Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York, 1937).
  9. Griffin, Hubbard, and Wald, Optical Society of America Meeting, Cleveland, March, 1946.
  10. R. L. Tousey and D. E. Mitchell, Optical Society of America Meeting, Cleveland, March, 1946.

1936 (1)

C. F. Goodeve, Proc. Roy. Soc. A155, 644 (1936).

1933 (1)

R. E. Rose, Ind. Eng. Chem. 25, 1028 (1933) U. S. Patent1,674,128 (1928).
[Crossref]

Forsythe, W. E.

W. E. Forsythe, Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York, 1937).

Goodeve, C. F.

C. F. Goodeve, Proc. Roy. Soc. A155, 644 (1936).

Griffin,

Griffin, Hubbard, and Wald, Optical Society of America Meeting, Cleveland, March, 1946.

Hubbard,

Griffin, Hubbard, and Wald, Optical Society of America Meeting, Cleveland, March, 1946.

Mitchell, D. E.

R. L. Tousey and D. E. Mitchell, Optical Society of America Meeting, Cleveland, March, 1946.

Rose, R. E.

R. E. Rose, Ind. Eng. Chem. 25, 1028 (1933) U. S. Patent1,674,128 (1928).
[Crossref]

Rowe, F. M.

F. M. Rowe, Society of Dyers and Colourists, Colour Index (Chorley and Pickersgill, Ltd., Leeds, 1924).

Tousey, R. L.

R. L. Tousey and D. E. Mitchell, Optical Society of America Meeting, Cleveland, March, 1946.

Wald,

Griffin, Hubbard, and Wald, Optical Society of America Meeting, Cleveland, March, 1946.

Ind. Eng. Chem. (1)

R. E. Rose, Ind. Eng. Chem. 25, 1028 (1933) U. S. Patent1,674,128 (1928).
[Crossref]

Proc. Roy. Soc. (1)

C. F. Goodeve, Proc. Roy. Soc. A155, 644 (1936).

Other (8)

W. E. Forsythe, Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York, 1937).

Griffin, Hubbard, and Wald, Optical Society of America Meeting, Cleveland, March, 1946.

R. L. Tousey and D. E. Mitchell, Optical Society of America Meeting, Cleveland, March, 1946.

C.I. indicates the color index number as given by Rowe.1

Manufactured by American Cyanamid Company.

Manufactured by Southern Pine Chemical Company.

Manufactured by the Reichhold Chemical Company.

F. M. Rowe, Society of Dyers and Colourists, Colour Index (Chorley and Pickersgill, Ltd., Leeds, 1924).

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Figures (7)

Fig. 1
Fig. 1

A comparison of the absorption bands of a suitable (1) and an unsuitable (2) dye for an infra-red filter. Pontamine Diazo Blue NA (C.I. 317)Pontamine Sky Blue FF (C.I. 518)

Fig. 2
Fig. 2

The effect of structural variation on the slope of the long wave-length side of the absorption band. Concentration 0.0002M. Pontamine Diazo Blue NA (C.I. 317)Sulphon Cyanine New GA (C.I. 288)Chlorantine Fast Blue 4 GL (C.I. 533)

Fig. 3
Fig. 3

Filter transmission curves for the visible and near infra-red regions.

Fig. 4
Fig. 4

A comparison of infra-red filters. (1, 3, 5, 8, and 11) Ohio State University filters, (2) Wratten 87 filter, (4, 6, and 9) German filters, (7) Corning 2550 glass filter, (10) Corning 2540 glass filter.

Fig. 5
Fig. 5

(1) Spectral sensitivity of the human eye, (2) spectral sensitivity of the S-2 cesium oxide photo-cell, (3) radiant energy distribution for tungsten at 2848°, and (4) filter transmission curve.

Fig. 6
Fig. 6

Infra-red photometer.

Fig. 7
Fig. 7

Filter evaluation curves for (1) Luxol Fast Black L, (2) Luxol Fast Blue G, (3) Pontamine Diazo Blue NA (DOTG salt).

Tables (3)

Tables Icon

Table I The structural formulas of the most satisfactory dyes for near infra-red filters.

Tables Icon

Table II Most satisfactory dyes for filters in the visible and infra-red regions.

Tables Icon

Table III Transmission and merit values of infra-red filters.

Equations (2)

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T υ = ψ λ T λ I λ d λ ψ λ I λ d λ ,
T r = R λ T λ I λ d λ R λ I λ d λ .