An Optical Open Area Ratiometer

Fred M. Dickey; Mark A Petersen

doi:10.1117/12.7972605

1 October 1980 An Optical Open Area Ratiometer

Fred M. Dickey, Mark A Petersen

Author Affiliations +

Optical Engineering, Vol. 19, Issue 5, 195793 (October 1980). https://doi.org/10.1117/12.7972605

Abstract

An optical method for measuring the percent of open area of perforated sheet materials is presented. The technique, which is based on Fourier optics, uses a detector to measure a small central portion of the light in the Fraunhofer diffraction pattern of the perforated sheet. This approach offers accuracy and speed while avoiding diffraction problems associated with arrays of small holes. In addition it can be used with translucent materials. A brief theoretical analysis is presented as well as results obtained with a laboratory system. The system is being developed to inspect perforated materials fabricated for use on noise suppression systems for aircraft engines, however, it should be useful in the general noncontact determination of the open area of perforated materials.

Citation Download Citation

Fred M. Dickey and Mark A Petersen "An Optical Open Area Ratiometer," Optical Engineering 19(5), 195793 (1 October 1980). https://doi.org/10.1117/12.7972605

Published: 1 October 1980

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