Abstract

By a consistent argument, based on the characteristic curves of photographic plates, the optimum conditions for the following spectrographic problems are derived: weak emission line without background; weak absorption line; weak emission line on a given continuous background; prefogging; measurement of relative intensities. The effect of the grain on the resolving power is minimized by averaging over the length of the line. This technique gives to the very sensitive plate (Kodak type I-O), in spite of its coarse grain, the same high resolving power as that of a very fine grain plate which requires a 90 times longer exposure.

© 1956 Optical Society of America

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References

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  1. G. R. Harrison gave a detailed discussion of photographic photometry in J. Opt. Soc. Am. 19, 267 (1929) and J. Opt. Soc. Am. 20, 313 (1930).
    [Crossref]
  2. O. Oldenberg, J. Chem. Phys. 3, 267 (1935).
    [Crossref]
  3. L. M. Branscomb, J. Opt. Soc. Am. 41, 255 and 862 (1951). Branscomb’s rigorous treatment takes into account the effect of grain fluctuations which depend on the transmission of the plate.
    [Crossref]
  4. W. Linnik, Z. Physik 61, 700 (1930). Related methods are described by O. Oldenberg, Z. Physik 58, 722 (1929).
    [Crossref]
  5. L. M. Branscomb, Phys. Rev. 82, 86 (1951).
    [Crossref]

1951 (2)

1935 (1)

O. Oldenberg, J. Chem. Phys. 3, 267 (1935).
[Crossref]

1930 (1)

W. Linnik, Z. Physik 61, 700 (1930). Related methods are described by O. Oldenberg, Z. Physik 58, 722 (1929).
[Crossref]

1929 (1)

Branscomb, L. M.

Harrison, G. R.

Linnik, W.

W. Linnik, Z. Physik 61, 700 (1930). Related methods are described by O. Oldenberg, Z. Physik 58, 722 (1929).
[Crossref]

Oldenberg, O.

O. Oldenberg, J. Chem. Phys. 3, 267 (1935).
[Crossref]

J. Chem. Phys. (1)

O. Oldenberg, J. Chem. Phys. 3, 267 (1935).
[Crossref]

J. Opt. Soc. Am. (2)

Phys. Rev. (1)

L. M. Branscomb, Phys. Rev. 82, 86 (1951).
[Crossref]

Z. Physik (1)

W. Linnik, Z. Physik 61, 700 (1930). Related methods are described by O. Oldenberg, Z. Physik 58, 722 (1929).
[Crossref]

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Figures (3)

Fig. 1
Fig. 1

Characteristic curves of photographic plates (density D versus log intensity).

Fig. 2
Fig. 2

Density D versus intensity I for Type V-O.

Fig. 3
Fig. 3

Comparison of resolving power. (a) CN band photographed on Kodak I-O plate; (b) same photograph, paper shifted during enlargement; (c) CN band photographed on Kodak lantern slide medium plate; all taken with the first order of a 21-foot grating and 20-fold enlarged.

Equations (2)

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( - Δ T / T ) / ( Δ I / I ) = ( - Δ log T ) / ( Δ log I ) = ( Δ log 1 / T ) / ( Δ log I ) = Δ D / Δ log I
- Δ T / T = Δ log 1 / T = Δ D .