Abstract

A theory is presented to account for the fact that a photoconductive cell can detect when an image projected on it is in sharpest focus. Each of the small particles in the photoconductive surface is treated as an individual photoconductor in series–parallel connection with all the other particles. When the distribution of light on the surface of such a photoconductive cell is varied (total incident flux being constant) the total conductance across the whole surface of the cell depends upon detail contrast, acutance, and other factors of the projected image. The observed dependence of conductance on sharpness of focus can be explained by this theory.

© 1964 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Equidensitometry by coherent optical filtering

H. K. Liu, J. W. Goodman, and J. L-H. Chan
Appl. Opt. 15(10) 2394-2399 (1976)

Nonlinear optical processing: analysis and synthesis

S. R. Dashiell and A. A. Sawchuk
Appl. Opt. 16(4) 1009-1025 (1977)

Nonlinear filtering in coherent optical systems through halftone screen processes

Hisatoyo Kato and J. W. Goodman
Appl. Opt. 14(8) 1813-1824 (1975)

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 (5)

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

Equations (10)

You do not have subscription access to this journal. Equations 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