Abstract

A method of obtaining spectrophotometric data plotted directly, relative approximately to magnesium oxide yet using glass samples, is described. The method consists of measuring a glass filter in series with the reflectance sample and using an opaque white glass as the reference sample. The transmitting glass is chosen so that over the wave-length range of interest its transmittance is approximately equal to the ratio of the reflectance of the opaque white glass to the reflectance of magnesium oxide.

© 1949 Optical Society of America

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References

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  1. Proc. C.I.E., Eighth Session, Cambridge (September1931), p. 23.
  2. Harry J. Keegan, J. Opt. Soc. Am. 38, 658 (1948).
  3. O. W. Pineo, U. S. Patent2,218,357.
  4. Benford, Lloyd, and Schwarz, J. Opt. Soc. Am. 38, 445–7 (1948).
    [CrossRef] [PubMed]
  5. O. W. Pineo, U. S. Patent2,107,836.
  6. Arthur C. Hardy, J. Opt. Soc. Am. 25. 305–311 (1935).
    [CrossRef]
  7. R. H. Kienle and E. I. Stearns, Instruments 20, 1057–64 (1947).
  8. W. E. K. Middleton, J. Opt. Soc. Am. 38, 74 (1948).
    [CrossRef]

1948 (3)

1947 (1)

R. H. Kienle and E. I. Stearns, Instruments 20, 1057–64 (1947).

1935 (1)

Benford,

Hardy, Arthur C.

Keegan, Harry J.

Harry J. Keegan, J. Opt. Soc. Am. 38, 658 (1948).

Kienle, R. H.

R. H. Kienle and E. I. Stearns, Instruments 20, 1057–64 (1947).

Lloyd,

Middleton, W. E. K.

Pineo, O. W.

O. W. Pineo, U. S. Patent2,218,357.

O. W. Pineo, U. S. Patent2,107,836.

Schwarz,

Stearns, E. I.

R. H. Kienle and E. I. Stearns, Instruments 20, 1057–64 (1947).

Instruments (1)

R. H. Kienle and E. I. Stearns, Instruments 20, 1057–64 (1947).

J. Opt. Soc. Am. (4)

Other (3)

O. W. Pineo, U. S. Patent2,107,836.

O. W. Pineo, U. S. Patent2,218,357.

Proc. C.I.E., Eighth Session, Cambridge (September1931), p. 23.

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Figures (1)

F. 1
F. 1

A schematic diagram of the integrating sphere showing the location of the glass filter. A—The glass filter in the sample beam. B—Sample. C—Opal standard (the combination of A and C comprises the “Compensated Opal”).

Tables (1)

Tables Icon

Table I Reflectance of a Vitrolite glass relative to magnesium oxide and relative to “Compensated Opal.”

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

R m P sin 2 α = R s P cos 2 α
R s = R m tan 2 α .