Abstract

The Beckman spectrophotometer Model DU has proved to be a useful instrument for measuring spectral directional reflectance. Like other spectrophotometers it is subject to slit-width and stray-energy errors. The magnitude of these errors and techniques for minimizing them are discussed. The viewing geometry and an adaptor for four-inch square specimens are described.

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  1. H. H. Cary and A. O. Beckman, J. Opt. Soc. Am. 31, 682 (1941).
  2. K. S. Gibson and M. M. Balcom, J. Research Natl Bur. Standards 38, 601, RP1798 (1947), J. Opt. Soc. Am. 37, 593 (1947).
  3. Beckman Bulletin 126-A, National Technical Laboratories, (December 1944).
  4. Commission International de L'Eclairage, Compt. rend., 8th Session, Cambridge, Resolution 3 (September 1931), page 23.
  5. K. S. Gibson, "Spectrophotometry," Natl. Bur. Standards Circular, 484 (1949),
  6. "Preparation and Colorimetric Properties of a Magnesium Oxide Reflectance Standard," Natl. Bur. Standards, LC547 (1939).
  7. W. E. Knowles Middleton and C. L. Sanders, J. Opt. Soc. Am. 41, 419 (1951).
  8. Natl. Bur. Standards Letter Circular LC929, "Standards for checking the calibration of spectrophotometers" (1948).
  9. Memorandum accompanying reports on the spectral directional reflectance of Vitrolite working standards, Natl. Bur. Standards (January 10, 1949).
  10. Beckman Bulletin 91, National Technical Laboratories, (February, 1947).
  11. IES Lighting Handbook (1947), first edition, section 6, p. 10.
  12. W. E. Forsythe, editor, Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York and London, 1937).
  13. Commercial Standard CS62-38, Colors for Kitchen Accessories (1938).

Balcom, M. M.

K. S. Gibson and M. M. Balcom, J. Research Natl Bur. Standards 38, 601, RP1798 (1947), J. Opt. Soc. Am. 37, 593 (1947).

Beckman, A.O.

H. H. Cary and A. O. Beckman, J. Opt. Soc. Am. 31, 682 (1941).

Cary, H. H.

H. H. Cary and A. O. Beckman, J. Opt. Soc. Am. 31, 682 (1941).

Gibson, K. S.

K. S. Gibson and M. M. Balcom, J. Research Natl Bur. Standards 38, 601, RP1798 (1947), J. Opt. Soc. Am. 37, 593 (1947).

K. S. Gibson, "Spectrophotometry," Natl. Bur. Standards Circular, 484 (1949),

Middleton, W. E. Knowles

W. E. Knowles Middleton and C. L. Sanders, J. Opt. Soc. Am. 41, 419 (1951).

Sanders, C. L.

W. E. Knowles Middleton and C. L. Sanders, J. Opt. Soc. Am. 41, 419 (1951).

Other (13)

H. H. Cary and A. O. Beckman, J. Opt. Soc. Am. 31, 682 (1941).

K. S. Gibson and M. M. Balcom, J. Research Natl Bur. Standards 38, 601, RP1798 (1947), J. Opt. Soc. Am. 37, 593 (1947).

Beckman Bulletin 126-A, National Technical Laboratories, (December 1944).

Commission International de L'Eclairage, Compt. rend., 8th Session, Cambridge, Resolution 3 (September 1931), page 23.

K. S. Gibson, "Spectrophotometry," Natl. Bur. Standards Circular, 484 (1949),

"Preparation and Colorimetric Properties of a Magnesium Oxide Reflectance Standard," Natl. Bur. Standards, LC547 (1939).

W. E. Knowles Middleton and C. L. Sanders, J. Opt. Soc. Am. 41, 419 (1951).

Natl. Bur. Standards Letter Circular LC929, "Standards for checking the calibration of spectrophotometers" (1948).

Memorandum accompanying reports on the spectral directional reflectance of Vitrolite working standards, Natl. Bur. Standards (January 10, 1949).

Beckman Bulletin 91, National Technical Laboratories, (February, 1947).

IES Lighting Handbook (1947), first edition, section 6, p. 10.

W. E. Forsythe, editor, Measurement of Radiant Energy (McGraw-Hill Book Company, Inc., New York and London, 1937).

Commercial Standard CS62-38, Colors for Kitchen Accessories (1938).

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