Abstract

When a spectrophotometer with the correct optical configuration is used to measure a fluorescent sample, the resulting spectral radiance factor curve consists of the sum of a reflected and a fluoresced portion. The true reflectance curve can be obtained by direct measurement below the emission region and also above the absorption region by the use of a fluorescence-killing filter. Between these two limits, in the region of simultaneous absorption and emission (the crossover region), the true reflectance curve can be obtained by calculation from two different spectral radiance factor curves and a single reading through the fluorescence-killing filter.

© 1973 Optical Society of America

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References

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  1. A. Berger, O. Koch, Die Farbe 9, 259 (1960).
  2. D. Eitle, E. Ganz, Textilveredlung 3, 389 (1968).
  3. F. Grum, Paper P71.22 presented at the 17th session of the CIE, Barcelona, 1971.
  4. R. Donaldson, Brit. J. Appl. Phys. 5, 210 (1954).
    [CrossRef]

1968

D. Eitle, E. Ganz, Textilveredlung 3, 389 (1968).

1960

A. Berger, O. Koch, Die Farbe 9, 259 (1960).

1954

R. Donaldson, Brit. J. Appl. Phys. 5, 210 (1954).
[CrossRef]

Berger, A.

A. Berger, O. Koch, Die Farbe 9, 259 (1960).

Donaldson, R.

R. Donaldson, Brit. J. Appl. Phys. 5, 210 (1954).
[CrossRef]

Eitle, D.

D. Eitle, E. Ganz, Textilveredlung 3, 389 (1968).

Ganz, E.

D. Eitle, E. Ganz, Textilveredlung 3, 389 (1968).

Grum, F.

F. Grum, Paper P71.22 presented at the 17th session of the CIE, Barcelona, 1971.

Koch, O.

A. Berger, O. Koch, Die Farbe 9, 259 (1960).

Brit. J. Appl. Phys.

R. Donaldson, Brit. J. Appl. Phys. 5, 210 (1954).
[CrossRef]

Die Farbe

A. Berger, O. Koch, Die Farbe 9, 259 (1960).

Textilveredlung

D. Eitle, E. Ganz, Textilveredlung 3, 389 (1968).

Other

F. Grum, Paper P71.22 presented at the 17th session of the CIE, Barcelona, 1971.

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Figures (6)

Fig. 1
Fig. 1

Schematic representation of spectral radiance factor curve of a fluorescent substance (ABC), together with true reflectance curve (ADEC) and reflectance curve of substrate (FGEC). The lines I, II, III, and IV represent schematic transmission curves of sharp cutoff filters.

Fig. 2
Fig. 2

Transmission curves of filters used with dyeings of fluorescent whiteners. Curve 1: D minus filter furnished with KCS-40 system; curve 2: GG-435, 6 mm; curve 3: GG-455, 2 mm.

Fig. 3
Fig. 3

Curves obtained on dyeing of 0.26% Calcofluor White CG on the weight of cotton. Top solid curve: spectral radiance factor curve with D 6500 illuminator; middle solid curve: same, but fluorescence-weakening filter used between illuminator and sphere; dashed curve: calculated true reflectance curve; bottom dotted curve: calculated fluorescence emission curve.

Fig. 4
Fig. 4

Curves obtained on dyeing of 0.26% Calcofluor White 5B on the weight of cotton. Curve designations as in Fig. 3.

Fig. 5
Fig. 5

Curves obtained on dyeing of Maxilon Red 2B on an acrylic fiber. Curve designations as in Fig. 3.

Fig. 6
Fig. 6

Greatly enlarged portion of Fig. 4, including measured true reflectance curve (bottom solid line).

Tables (1)

Tables Icon

Table I Readings on KCS-40; White Paper Sample; D 6500 Lamp Alone and Through Various Filters

Equations (7)

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S ( λ ) = R ( λ ) + F ( λ ) / E ( λ ) .
S 1 ( λ ) = R ( λ ) + F ( λ ) / k 1 E 1 ( λ ) .
S 2 ( λ ) = R ( λ ) + k F F ( λ ) / k 2 E 2 ( λ ) ,
S 2 ( λ ) = R ( λ ) + k F F ( λ ) / k 2 T ( λ ) E 1 ( λ ) .
R ( λ ) = [ S 2 ( λ ) T ( λ ) k 2 - S 1 ( λ ) k 1 k F ] / [ k 2 T ( λ ) - k 1 k F ] .
R ( λ ) = [ S 2 ( λ ) T ( λ ) - S 1 ( λ ) k ] / [ T ( λ ) - k ] .
k = T ( w ) [ S 2 ( w ) - R ( w ) ] / [ S 1 ( w ) - R ( w ) ] .

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