Abstract

A microphotometer of the type described by Vincent and Sawyer has been altered optically and electrically to eliminate certain objectionable features. Scattered light, dependence of the plate projection lens upon the aperture of the plate illumination system, photo-cell fatigue, relatively short life of the projection lamp, and the need for a constant voltage power supply have been eliminated. Plate calibration curves obtained with the altered instrument on wide bands and narrow lines are essentially identical.

© 1949 Optical Society of America

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References

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  1. H. B. Vincent and R. A. Sawyer, J. Opt. Soc. Am. 31, 639 (1941).
    [Crossref]
  2. M. H. Sweet, J. Opt. Soc. Am. 36, 432 (1946).
  3. Subject of patent proceedings.
  4. H. S. Anker, Electronics, June, 1947, p. 138.

1947 (1)

H. S. Anker, Electronics, June, 1947, p. 138.

1946 (1)

M. H. Sweet, J. Opt. Soc. Am. 36, 432 (1946).

1941 (1)

Anker, H. S.

H. S. Anker, Electronics, June, 1947, p. 138.

Sawyer, R. A.

Sweet, M. H.

M. H. Sweet, J. Opt. Soc. Am. 36, 432 (1946).

Vincent, H. B.

Electronics (1)

H. S. Anker, Electronics, June, 1947, p. 138.

J. Opt. Soc. Am. (2)

Other (1)

Subject of patent proceedings.

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Figures (3)

Fig. 1
Fig. 1

Schematic of the revised optical system.

Fig. 2
Fig. 2

Electrical system showing the voltage-regulating and lamp monitoring device and the impedance matching amplifier between the measuring photomultiplier and the galvanometer.

Fig. 3
Fig. 3

Calibration curves for a photographic plate obtained from readings on lines and bands, taken with different microphotometer conditions: (A) Original microphotometer with full aperture; (B) Original microphotometer with small aperture; (C) Revised microphotometer.