Abstract

A rotating-sector attenuator has been constructed using components of readily available precision. The transmittance of the attenuator is adjustable in motion through a differential gear system and can be read from a dial with a precision of about ±0.02% of maximum transmittance. The sector has been used to measure and calibrate the photometric properties of spectrophotometers in the ultraviolet, visible, and infrared regions. It has also been used as an attenuator in an optical-null infrared spectrophotometer in place of the usual comb. Absorption spectra of typical samples have been made with a precision of ±0.04% transmittance. Transmittance and absorptivity data are presented for samples of calcium fluoride in the 700 to 1300 cm−1 spectral region.

© 1962 Optical Society of America

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References

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  1. J. W. T. Walsh, Photometry (Constable, London, 1953), 2nd ed.
  2. G. Kortüm, Kolorimetrie, Photometrie, und Spektrometrie (Springer-Verlag, Berlin, 1955).
    [CrossRef]
  3. G. Kortüm, Z. Instrumentenk. 54, 373 (1934).
  4. A. Bayle, Rev. opt. 27, 314 (1948).
  5. C. W. Keuffel, J. Opt. Soc. Am. 11, 403 (1925).
    [CrossRef]
  6. R. A. Oetjen, L. C. Roess, J. Opt. Soc. Am. 41, 203 (1951).
    [CrossRef]
  7. H. M. Richardson, R. G. Fowler, M. L. Coffman, J. Opt. Soc. Am. 43, 873 (1953).
    [CrossRef]
  8. A. F. A. Harper, A. J. Mortlock, Brit. J. Appl. Phys. 4, 220 (1953).
    [CrossRef]
  9. Data of Langley, Paschen, and Rubens given by Coblentz, J. Opt. Soc. Am. 4, 432 (1920).
    [CrossRef]
  10. Ramadier-Delbes, J. phys. radium 11, 622 (1950).
    [CrossRef]
  11. W. I. Kaye, private communication.

1953

A. F. A. Harper, A. J. Mortlock, Brit. J. Appl. Phys. 4, 220 (1953).
[CrossRef]

H. M. Richardson, R. G. Fowler, M. L. Coffman, J. Opt. Soc. Am. 43, 873 (1953).
[CrossRef]

1951

1950

Ramadier-Delbes, J. phys. radium 11, 622 (1950).
[CrossRef]

1948

A. Bayle, Rev. opt. 27, 314 (1948).

1934

G. Kortüm, Z. Instrumentenk. 54, 373 (1934).

1925

1920

Bayle, A.

A. Bayle, Rev. opt. 27, 314 (1948).

Coblentz,

Coffman, M. L.

Fowler, R. G.

Harper, A. F. A.

A. F. A. Harper, A. J. Mortlock, Brit. J. Appl. Phys. 4, 220 (1953).
[CrossRef]

Kaye, W. I.

W. I. Kaye, private communication.

Keuffel, C. W.

Kortüm, G.

G. Kortüm, Z. Instrumentenk. 54, 373 (1934).

G. Kortüm, Kolorimetrie, Photometrie, und Spektrometrie (Springer-Verlag, Berlin, 1955).
[CrossRef]

Mortlock, A. J.

A. F. A. Harper, A. J. Mortlock, Brit. J. Appl. Phys. 4, 220 (1953).
[CrossRef]

Oetjen, R. A.

Ramadier-Delbes,

Ramadier-Delbes, J. phys. radium 11, 622 (1950).
[CrossRef]

Richardson, H. M.

Roess, L. C.

Walsh, J. W. T.

J. W. T. Walsh, Photometry (Constable, London, 1953), 2nd ed.

Brit. J. Appl. Phys.

A. F. A. Harper, A. J. Mortlock, Brit. J. Appl. Phys. 4, 220 (1953).
[CrossRef]

J. Opt. Soc. Am.

J. phys. radium

Ramadier-Delbes, J. phys. radium 11, 622 (1950).
[CrossRef]

Rev. opt.

A. Bayle, Rev. opt. 27, 314 (1948).

Z. Instrumentenk.

G. Kortüm, Z. Instrumentenk. 54, 373 (1934).

Other

J. W. T. Walsh, Photometry (Constable, London, 1953), 2nd ed.

G. Kortüm, Kolorimetrie, Photometrie, und Spektrometrie (Springer-Verlag, Berlin, 1955).
[CrossRef]

W. I. Kaye, private communication.

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Figures (3)

Fig. 1
Fig. 1

Schematic drawing of rotating-sector attenuator.

Fig. 2
Fig. 2

Infrared transmittance of calcium fluoride, measured with Beckman IR-7 spectrophotometer using rotating-sector optical attenuator.

Fig. 3
Fig. 3

Absorptivities of calcium fluoride plates at 29°C. The data of Ballard are taken from “The Optical and Other Physical Properties of Infrared Optical Materials,” p. 61, final report for ERDL Contract W-44-009 eng-473, 1949, quoted in American Institute of Physics Handbook, pp. 6-37.

Equations (2)

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Ω 4 = N 3 N 1 Ω 1 / N 2 N 4 = ( N 1 / N 2 ) 2 Ω 1
Ω o = [ 1 ( N 1 / N 2 ) 2 ] Ω 1 .

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