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LDV is a technique to measure the velocity of a flow based on the measurement of light scattering caused by particles in the flow. Therefore, the flow has to be seeded with particles capable to follow the flow such that their movement reflects the motion of the flow well. According to the Doppler effect, the frequency of reflected radiation from a flowing particle is shifted from that of the incident light. The change in the frequency is a function of the velocity of the particle. LDV is one of the well-established optical measurement techniques for gas and liquid flows. The principle of LDV is to cross two coherent, collimated and monochromatic laser light beams. At the intersection an interference pattern is generated by the light and particles that pass through this pattern will scatter light at a frequency which is directly proportional to the particle velocity, the angle between the laser beams and the frequency of the laser light. Decisive advantages of the technique are non‐intrusiveness, directional sensitivity, high spatial and temporal resolution, and high accuracy.