Microdensitometers,

C. S. Miller; I. L. Kofsky; C. A. Trowbridge; F. G. Parsons

doi:10.1117/12.7971666

1 December 1973 Microdensitometers,

C. S. Miller, I. L. Kofsky, C. A. Trowbridge, F. G. Parsons

Author Affiliations +

Optical Engineering, Vol. 12, Issue 6, 126226 (December 1973). https://doi.org/10.1117/12.7971666

Abstract

The photometric fidelity of the optical system of microdensitometers is compared to that of flying-spot scanning devices. Microdensitometers, which were originally developed to study fine structure of silver halide photographic images, move the object plane through a fixed, Koehler-illuminated dual projection optical system that controls scattered light and ensures uniform photometric response everywhere on the scanned area. Flying-spot and video-based scanners now being applied to photographic photometry are optical reciprocals of one another. They operate on a critically-illuminated image of the film similar to that produced by a camera, and therefore require precautionary measures to limit errors from flare light and their inherent lack of spatial stationarity. The low inertia of such systems permits high data-sampling speeds with the possibility of preprogrammed or adaptive scans under computer control. Advances in stage design, however, now allow microdensitometer optical systems also to sample at photon noise limited rates. One such microdensitometer, a spiral-scanning EDP Scanning Microscope, is described and examples of its real-time-processed density displays ("isophote plots") and computer interfaces are given.

Citation Download Citation

C. S. Miller, I. L. Kofsky, C. A. Trowbridge, and F. G. Parsons "Microdensitometers,," Optical Engineering 12(6), 126226 (1 December 1973). https://doi.org/10.1117/12.7971666

Published: 1 December 1973

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE