Abstract

An apparatus has been assembled and is presently being used to evaluate the color temperatures of incandescent tungsten lamps by physical comparison techniques. A red-to-violet ratio method of establishing the effective slope of the radiometric function is utilized. The apparatus uses a single 931-A photomultiplier to receive radiations from the “standard” and “unknown” lamps through red and violet filters sequentially. Resultant oscilloscope patterns are judged for equality. Accurate results can be obtained in a short period of time, thus permitting large quantities of lamps to be calibrated with a minimum of effort.

© 1952 Optical Society of America

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References

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  1. W. E. K. Middleton and A. R. Ramsey, Can. J. Research 26, Sec. A, 23–28 (1948–1949).
    [Crossref]
  2. J. F. Preston, Proc. Phys. Soc. (London) 47, 1012 (1935).
    [Crossref]
  3. C. H. Sharp, J. Opt. Soc. Am. 20, 62–70 (1930).
    [Crossref]
  4. G. T. Winch, J. Sci. Instr. 6, 374–379 (1929).
    [Crossref]
  5. F. Hamburger and E. J. King, J. Opt. Soc. Am. 38, 875–879 (1948).
    [Crossref] [PubMed]

1948 (1)

1935 (1)

J. F. Preston, Proc. Phys. Soc. (London) 47, 1012 (1935).
[Crossref]

1930 (1)

1929 (1)

G. T. Winch, J. Sci. Instr. 6, 374–379 (1929).
[Crossref]

Hamburger, F.

King, E. J.

Middleton, W. E. K.

W. E. K. Middleton and A. R. Ramsey, Can. J. Research 26, Sec. A, 23–28 (1948–1949).
[Crossref]

Preston, J. F.

J. F. Preston, Proc. Phys. Soc. (London) 47, 1012 (1935).
[Crossref]

Ramsey, A. R.

W. E. K. Middleton and A. R. Ramsey, Can. J. Research 26, Sec. A, 23–28 (1948–1949).
[Crossref]

Sharp, C. H.

Winch, G. T.

G. T. Winch, J. Sci. Instr. 6, 374–379 (1929).
[Crossref]

Can. J. Research (1)

W. E. K. Middleton and A. R. Ramsey, Can. J. Research 26, Sec. A, 23–28 (1948–1949).
[Crossref]

J. Opt. Soc. Am. (2)

J. Sci. Instr. (1)

G. T. Winch, J. Sci. Instr. 6, 374–379 (1929).
[Crossref]

Proc. Phys. Soc. (London) (1)

J. F. Preston, Proc. Phys. Soc. (London) 47, 1012 (1935).
[Crossref]

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Figures (6)

Fig. 1
Fig. 1

Oscilloscope patterns. A. Balanced color temperatures and illuminance. B. Unbalanced condition in both variables.

Fig. 2
Fig. 2

Schematic diagram of comparator.

Fig. 3
Fig. 3

Four positions of filter disk during a complete scanning cycle.

Fig. 4
Fig. 4

Transmission characteristics—Corning Nos. 2404 and 5113.

Fig. 5
Fig. 5

Relative energy distribution for tungsten at 2854° Kelvin.

Fig. 6
Fig. 6

931-A photocell spectral characteristic.