Holographic PIV with Low Coherent Light – Recent Progress in 3D Flow Measurements

Abstract

AbstractHolographic PIV (HPIV) is a fully three-dimensional technique for measuring flows. A field of small tracer-particles is recorded in double-exposure holograms obtained with two reference waves. Particle displacements are extracted from CCD-based 3D-scans of real images with three-dimensional correlation methods. To cope with the problem of noise from out-of-focus particles the technique of light-in-flight holography has been introduced that utilizes properties of low coherent laser light. This drastically increases the signal-to-noise ratio in deep-field particle holography. Some experimental checks of these concepts are presented and first results from measurements in the wake of an airfoil are shown.KeywordsReal ImageReference BeamSpeckle NoiseReference WaveObject LightThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.