The ever-increasing requirements of product quality and reliability demand more efficient measuring and testing methods. Developed in the past decade, shearography--also called speckle pattern shearing interferometry--is a coherent-optical measuring and testing method, similar to holographic interferometry. This book describes the development of second-generation digital shearography, which is especially effective in nondestructive testing, strain measurement, and vibration analysis due to its relative insensitivity to environmental disturbances.
The aim of this book is to present the shearographic method of strain analysis. The
availability of instruments such as the laser and laser diodes and the personal
computer itself in conjunction with the development of new methods and more
sophisticated interferometric and evaluating techniques have greatly increased the
range of problems for which digital shearography is the most viable means for
The author has endeavored to present the subject in such a manner that the book
will meet the requirements of the beginner as well as being of assistance to the
experienced research worker.
The author takes this opportunity to express his appreciation for the laboratory
assistance of Dr.-Ing. M. Schuth, Dr.-Ing. L.X. Yang, Labor-Ing. Ing. grad. G.
Kupfer, Dipl.-Ing. F. Vossing and Dipl.-Ing. P. Mackel, who wrote Sections 9.1 -
9.4. The author also wishes to express his gratitude to the mechanical and
electronic workshops of University Gh Kassel for manufacturing the precision
The author sincerely appreciates the help of Mrs. W. Barte in the careful
preparation of the manuscript and its continuous revision and completion, as well
as the design office of the University Gh Kassel for the figures and graphics.