Handbook of Optical Metrology, 2nd Edition

21	Fringe Analysis
Jun-ichi Kato

CONTENTS

21.1  Introduction.

21.2  Basics of Fringe Analysis

21.2.1  Method Using Multiple-Input Images

21.2.2  Method Using Single-Input Image

21.3  Phase Unwrapping

21.4  Practical Example of Fringe Analysis in Profilometry

21.5  Summary

Symbols

References

21.1    INTRODUCTION

In this chapter, basics of the “fringe analysis,” which is one of the major methods for digitizing various physical phenomena, are briefly introduced.

Merits of optical or image measurements are that they can quickly acquire spatial information of objects without contacting them. For example, in interferometry, which uses wave nature of light, a highly accurate distribution of physical information such as surface height, deformation, ...