Spatial Filtering Velocimetry: Fundamentals and Applications - Yoshihisa Aizu, Toshimitsu Asakura - Google Books

https://books.google.de/books?id=Stt3oryaD1EC

The invention of lasers in the early 1960s enhanced the rapid development of optoelectronics which had introduced various optical measurement methods. A typical example of the methods is found in measurements of velocity. It is well recognized that optical…