Laser Doppler velocimetry

Laser Doppler Velocimetry (LDV) is a technique used to measure the speed of particles or fluid flow by analyzing how laser light interacts with moving particles. When a laser beam hits a particle, the light is scattered and its frequency shifts slightly if the particle is moving—a phenomenon called the Doppler effect. By measuring this frequency change, scientists can determine the particle’s velocity very precisely. LDV is non-intrusive, meaning it doesn’t disturb the flow, making it valuable for understanding fluid dynamics in research, engineering, and process control.