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In thermal spraying processes, particle velocities are a key parameter influencing the coating properties. In addition, the analysis of particle velocities can often enhance our understanding of the processes themselves. Suitable diagnostic methods for particle velocity measurements addressing the requirements of thermal spraying are therefore needed. One diagnostic method currently being field‐tested is Particle Image Velocimetry (PIV). In this paper, the principle of PIV and methods of analyzing PIV images will be presented.