Optical Design Considerations and Test Results for a Linear Microdensitometer

David J. Cronin; George O. Reynolds

doi:10.1117/12.7971662

1 December 1973 Optical Design Considerations and Test Results for a Linear Microdensitometer

David J. Cronin, George O. Reynolds

Author Affiliations +

Optical Engineering, Vol. 12, Issue 6, 126201 (December 1973). https://doi.org/10.1117/12.7971662

Abstract

Tradeoff studies were made and tests were performed on the optical scanning system of a linear microdensitometer. The final system includes a laser source, an illuminator system capable of producing a 1 m spot on the film, a wide anglecollection system (NA > 1.0), and a photodiode detector. Performance of the optical system was verified by breadboard tests. The test results showed a square wave response of 99 percent at 200 kp/mm and greater than 90 percent at 500 Qp/mm. Tests performed with the 1µm scanning spot and NA 1.0 collection indicate that the optical system was linear (as measured by nonresponse to a phase target) for object frequencies up to 500 Qp/mm. The photometric precision was +0.01 D from 0 D to 2 D and +0.02 from 2 D to 4 D. These precisions were obtained at scanning speeds up to 8000 samples/sec.

Citation Download Citation

David J. Cronin and George O. Reynolds "Optical Design Considerations and Test Results for a Linear Microdensitometer," Optical Engineering 12(6), 126201 (1 December 1973). https://doi.org/10.1117/12.7971662

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

Includes PDF, HTML & Video, when available