Abstract

Either of two problems in calibrating Maxwellian-view optical systems can arise when troland value is calculated from measurements made by photometers requiring a visual match. Both problems lead to inaccurate estimates of light levels produced by the optical system.

© 1982 Optical Society of America

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References

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  1. G. Wyszecki and W. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulas (Wiley, New York, 1967), pp. 212–214.
  2. D. A. Palmer, "Mesopic photometry with nonmonochromatic lights," J. Opt. Soc. Am. 64, 1386 (1974); "Standard observer for large-field photometry at any level," J. Opt. Soc. Am. 58, 1296–1299 (1968); "The definition of a standard observer for mesopic photometry," Vision Res. 7, 619–628 (1967).
  3. G. Westheimer, "The Maxwellian view," Vision Res. 6, 669–682 (1966).
  4. D. B. Judd, "Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight," CIE Proc. 1(7), 11 (1951).
  5. There is an additional problem caused by changes of focus of the objective of the SEI meter with change of distance to the test plate. This has been treated by S. Harigovindan and M. V. Rao, "Radiometric errors due to focusing collecting optics at varying object distances," Appl. Opt. 20, 2590–2594 (1981).
  6. This suggests that the observer may experience some averaging of brightness within portions of the object field and/or that diffraction or other optical factors may blur the edge of the bright center area. It should be noted that a distinct transition between penumbral and center fields was never observed during any of these tests.

1981

1974

D. A. Palmer, "Mesopic photometry with nonmonochromatic lights," J. Opt. Soc. Am. 64, 1386 (1974); "Standard observer for large-field photometry at any level," J. Opt. Soc. Am. 58, 1296–1299 (1968); "The definition of a standard observer for mesopic photometry," Vision Res. 7, 619–628 (1967).

1966

G. Westheimer, "The Maxwellian view," Vision Res. 6, 669–682 (1966).

1951

D. B. Judd, "Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight," CIE Proc. 1(7), 11 (1951).

Harigovindan, S.

Judd, D. B.

D. B. Judd, "Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight," CIE Proc. 1(7), 11 (1951).

Palmer, D. A.

D. A. Palmer, "Mesopic photometry with nonmonochromatic lights," J. Opt. Soc. Am. 64, 1386 (1974); "Standard observer for large-field photometry at any level," J. Opt. Soc. Am. 58, 1296–1299 (1968); "The definition of a standard observer for mesopic photometry," Vision Res. 7, 619–628 (1967).

Rao, M. V.

Stiles, W.

G. Wyszecki and W. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulas (Wiley, New York, 1967), pp. 212–214.

Westheimer, G.

G. Westheimer, "The Maxwellian view," Vision Res. 6, 669–682 (1966).

Wyszecki, G.

G. Wyszecki and W. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulas (Wiley, New York, 1967), pp. 212–214.

Appl. Opt.

CIE Proc.

D. B. Judd, "Report of U.S. Secretariat Committee on Colorimetry and Artificial Daylight," CIE Proc. 1(7), 11 (1951).

J. Opt. Soc. Am.

D. A. Palmer, "Mesopic photometry with nonmonochromatic lights," J. Opt. Soc. Am. 64, 1386 (1974); "Standard observer for large-field photometry at any level," J. Opt. Soc. Am. 58, 1296–1299 (1968); "The definition of a standard observer for mesopic photometry," Vision Res. 7, 619–628 (1967).

Vision Res.

G. Westheimer, "The Maxwellian view," Vision Res. 6, 669–682 (1966).

Other

This suggests that the observer may experience some averaging of brightness within portions of the object field and/or that diffraction or other optical factors may blur the edge of the bright center area. It should be noted that a distinct transition between penumbral and center fields was never observed during any of these tests.

G. Wyszecki and W. Stiles, Color Science: Concepts and Methods, Quantitative Data and Formulas (Wiley, New York, 1967), pp. 212–214.

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