Surface Finish From Reflected Laser Light

H. S. Corey

doi:10.1117/12.938212

15 December 1978 Surface Finish From Reflected Laser Light

H. S. Corey

Proceedings Volume 0153, Advances in Optical Metrology I; (1978) https://doi.org/10.1117/12.938212
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

The characteristics of reflectance patterns generated when a laser beam strikes a machined surface contain adequate information to determine the degree of surface finish. An 'extensive development endeavor has established equipment and procedures required to properly extract data from reflectance patterns to obtain a repeatable correlation between the gleaned information and surface finish. Two types of reflective patterns have been utilized: diffracted reflection from single-point-turned periodic surfaces, and diffuse reflection from random-ground or honed surfaces. Surface finishes ranging from 0.025 to 2 micrometers (1 to 80 microinches), AA, have been measured by using visible laser radiation on the finer surfaces and infrared lasers on rougher materials. Using this method to measure a surface finish provides a noncontact procedure and does not require critical alignment as is often the case when using a stylus instrument on curved surfaces. Data have been obtained by making full-pattern scans, then integrating the area under the curves and by measuring the intensity ratio at two predetermined points. Calibration curves rtave lbeen developed that produce straight lines on log-log graph paper. Also, production inspection equipment has been fabricated to measure the surface finish of parts by the ratio method.

Citation Download Citation

H. S. Corey "Surface Finish From Reflected Laser Light", Proc. SPIE 0153, Advances in Optical Metrology I, (15 December 1978); https://doi.org/10.1117/12.938212

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