Abstract

The photometric separator here described, illuminated by monochromatic light, enables accurate visual measurements of the transmission factors of parallel plates to be made. The geometrical design has been developed to eliminate systematic errors. The scale of densities depends upon Talbot law. Within the uncertainties of visual settings, the results of measurements are in very good accordance with those obtained from the best available photoelectric methods. Improvements are possible with a larger monochromator.

© 1950 Optical Society of America

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References

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  1. J. Terrien and F. Desvignes, J. de phys. et rad., [8] 10, 6 (1946).
    [Crossref]
  2. J. Terrien and F. Desvignes, Rev. d’optique 27, 451 (1948).
  3. J. Terrien and F. Desvignes, Mesures 13, 411 (1948).

1948 (2)

J. Terrien and F. Desvignes, Rev. d’optique 27, 451 (1948).

J. Terrien and F. Desvignes, Mesures 13, 411 (1948).

1946 (1)

J. Terrien and F. Desvignes, J. de phys. et rad., [8] 10, 6 (1946).
[Crossref]

Desvignes, F.

J. Terrien and F. Desvignes, Rev. d’optique 27, 451 (1948).

J. Terrien and F. Desvignes, Mesures 13, 411 (1948).

J. Terrien and F. Desvignes, J. de phys. et rad., [8] 10, 6 (1946).
[Crossref]

Terrien, J.

J. Terrien and F. Desvignes, Rev. d’optique 27, 451 (1948).

J. Terrien and F. Desvignes, Mesures 13, 411 (1948).

J. Terrien and F. Desvignes, J. de phys. et rad., [8] 10, 6 (1946).
[Crossref]

J. de phys. et rad., [8] (1)

J. Terrien and F. Desvignes, J. de phys. et rad., [8] 10, 6 (1946).
[Crossref]

Mesures (1)

J. Terrien and F. Desvignes, Mesures 13, 411 (1948).

Rev. d’optique (1)

J. Terrien and F. Desvignes, Rev. d’optique 27, 451 (1948).

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Figures (6)

Fig. 1
Fig. 1

Shape of the openings of the Talbot disk. The densities are determined by geometric measurements; their values are approximately in the proportions of 0.5–1.0–1.5–2.0.

Fig. 2
Fig. 2

Schematic diagram of the spectrophotometric scheme, including monochromator. Mirror P1 reflects measuring beam and P2 reflects comparison beam.

Fig. 3
Fig. 3

Scale drawing of photometric separator. Part “A” is actually folded perpendicular to plane of drawing by prism P3.

Fig. 4
Fig. 4

Photograph of monochromator and photometric separator.

Fig. 5
Fig. 5

Appearance of object (left) as seen in photometer (right). Center strip from measuring beam and upper and lower segments from comparison beam.

Fig. 6
Fig. 6

Comparison of the results obtained visually with the photometric separator (–×–) and by photoelectric means (–·–).

Tables (1)

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Table I Measurements and calculations.

Equations (6)

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D = log 10 2 π α .
K = D 1 + C 0 + L 1 ( Δ C / Δ L ) + 0 ;
K = D 2 + C 0 + L 2 ( Δ C / Δ L ) + 0 ;
K = D 3 + C 0 + L 3 ( Δ C / Δ L ) + X .
Δ C / Δ L = ( D 2 - D 1 ) / ( L 1 - L 2 ) .
X = D 1 - D 3 + ( L 1 - L 3 ) ( Δ C / Δ L ) .