Spatial Filtering Velocimetry: Fundamentals and Applications

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 velocity measuring methods have important advantages, such as noncontacting and nondisturbing operations, over c— ventional methods employed previously. These fundamental advantages are indicated by the enormous research effort which has ...