Abstract

A new heterochromatic photometer has been devised that combines the features of the direct-comparison and the flicker methods. Two contiguous photometric fields (for example, red and blue) are viewed in a plane mirror which is pivoted at one end and oscillates approximately 2° at a frequency of 5 to 40 cps. Each left or right movement of the mirror is of constant velocity. This mirror oscillation causes the image of the vertical boundary between the two fields to oscillate and blur into a central zone in which the two colors are mixed. The mixed zone has a color graduation with the colors at its two boundaries the same as the adjacent fields, and a photometric match is achieved when the luminance becomes uniform and both boundary lines disappear. The disappearance of both boundary lines has proved to be a more precise indication than the disappearance of flicker in the central zone. Various tests, using both experienced and inexperienced observers, showed that in both ease of use and precision the new method is superior to the direct-comparison and the flicker methods. These tests involved field luminances from 32.50 candles/ft2 to 0.0011 candles/ft2.

© 1961 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Heterochromatic Photometry*

Ch. Fabry and Karl K. Darrow
J. Opt. Soc. Am. 10(5) 521-547 (1925)

Heterochromatic modulation photometry

Joel Pokorny, Vivianne C. Smith, and Margaret Lutze
J. Opt. Soc. Am. A 6(10) 1618-1623 (1989)

Comparison of Four Methods of Heterochromatic Photometry

Gunther Wagner and Robert M. Boynton
J. Opt. Soc. Am. 62(12) 1508-1515 (1972)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription