Holographic Particle Image Velocimetry

Abstract

The articles in this special feature of Measurement Science and Technology are devoted to an exciting area of fluid metrology pursuing the registration of flow velocities in three dimensions by particle holography—commonly termed holographic particle image velocimetry (HPIV) (Hinsch 2002). Already in 1993 this technique was considered to 'revolutionize the acquisition of velocity data in much the same way as did the inventions of hot wire anemometry and laser Doppler velocimetry' as E P Rood states in his foreword to the proceedings of the first workshop dedicated to the topic at the Washington ASME Fluid Engineering Conference (Rood 1993). The big step forward is to eliminate most of the depth-of-focus restrictions of classical PIV by a holographic recording of tracer particles. Thus, even non-stationary flows can be registered in a single record.