Abstract

In this paper, we consider how much coherence is admissible without affecting the linearity of a microdensitometer. Conditions required for linear operation are presented and discussed. We investigate the strength of these conditions by using differences between the shape of high-contrast- and low-contrast-edge images. The normalized image irradiance is calculated, based upon the theory of partially coherent image formation assuming diffraction-limited optics. Our results show that the numerical aperture of the influx optics must be greater than the numerical aperture of the efflux optics. Higher detail content of the sample requires increased overfilling of the efflux optics. In addition, the coherence interval at the source aperture (or preslit) must be equal to or less than the resolution limit of the microdensitometer when both distances are referred to the scale of the sample plane. Greater incoherence is required as the sample-detail content increases. These results are equally applicable to color or conventional microdensitometry.

© 1972 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Conditions for Microdensitometer Linearity*

Richard E. Swing
J. Opt. Soc. Am. 62(2) 199-207 (1972)

Linear Microdensitometry

D. N. Grimes
J. Opt. Soc. Am. 61(9) 1263-1263 (1971)

Bilinear system analysis for microdensitometers

Y. Sheng and J. Duvernoy
J. Opt. Soc. Am. A 3(8) 1320-1325 (1986)

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 (11)

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 (1)

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

Equations (35)

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