Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

Electronic shearography has proven to be a valuable tool in nondestructive evaluation. With this technique, correlation fringes corresponding to a deformation or movement of an object are produced electronically. In general, these correlation fringes are composed of random intensity fluctuations due to speckle, making it difficult to analyze the fringes and calculate the phase distribution accurately. If such quantitative information regarding the object is desired, direct interpretation of the fringe pattern is often attempted. Although various methods have been devised to accomplish this task, manual fringe counting is still often performed—a tedious job requiring much operator experience, yielding sparse data, and usually producing inaccurate results.

Volume

15A

Chapter

Chapter 2: Emerging Inspection Technologies

Section

Optical Techniques

Pages

673-677

DOI

10.1007/978-1-4613-0383-1_87

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

A Compact Digital Phase-Stepping Shearography System

Seattle, WA

Electronic shearography has proven to be a valuable tool in nondestructive evaluation. With this technique, correlation fringes corresponding to a deformation or movement of an object are produced electronically. In general, these correlation fringes are composed of random intensity fluctuations due to speckle, making it difficult to analyze the fringes and calculate the phase distribution accurately. If such quantitative information regarding the object is desired, direct interpretation of the fringe pattern is often attempted. Although various methods have been devised to accomplish this task, manual fringe counting is still often performed—a tedious job requiring much operator experience, yielding sparse data, and usually producing inaccurate results.