Particle Image Velocimetry

The development of Particle Image Velocimetry (PIV), a measurement technique, which allows for capturing velocity information of whole ?ow ?elds in fractions of a second, has begun in the eighties of the last century. In 1998, when this book has been published ?rstly, the PIV technique emerged from laboratories to applications in fundamental and industrial research, in par- lel to the transition from photo-graphicalto video recording techniques. Thus this book, whose objective was and is to serve as a practical guide to the PIV technique, found strong interest within the increasing group of users. The early progress made with the PIV technique might best be char- terized by the experience gained during our aerodynamic research at DLR (Deutsches Zentrum fur ¨ Luft- und Raumfahrt) at that time. The ?rst app- cations of PIV outside the laboratory, in wind tunnels, as performed in the mid-eighties were characterized by the following time scales: time required to set up the system and to obtain well focused photo-graphical PIV recordings was 2 to 3 days, time required to process the ?lm was 0. 5 to 1 day, time - quired to evaluate a single photo-graphicalPIV recording by means of optical evaluation methods was 24 to 48 hours. When the ?rst edition of this book was published in 1998, with electronic cameras and computers, it was pos- ble to focus on-line, to capture several recordings per second, and to evaluate a digital recording within seconds.

This practical guide provides comprehensive information on particle image velocimetry (PIV). The author uses theoretical background information to support the planning, performance, and understanding of experiments that employ the PIV technique. The second edition includes extensive revisions that take into account significant progress in the technique's refinement and development as well as the continuously broadening range of possible applications, which are illustrated by examples. Among the new topics covered are high speed imaging, three-component methods, advanced evaluation and post-processing techniques, and microscopic PIV. This book is primarily intended for engineers, scientists, and students who already have some basic knowledge of fluid mechanics and non-intrusive optical measurement techniques. It enables researchers and engineers to design and perform experiments successfully without becoming specialists in the field.

Physical and Technical Background.- Mathematical Background of Statistical PIV Evaluation.- PIV Recording Techniques.- Image Evaluation Methods for PIV.- Post-Processing of PIV Data.- Three-Component PIV Measurements.- Micro-PIV.- Examples of Application.- Related Techniques.