laserDoppleranemometrie

Laser Doppler Velocimetry (LDV), also known as laser Doppler anemometry, is a non-intrusive optical measurement technique used to measure fluid flow velocity. It relies on the Doppler effect, which describes the change in frequency of a wave in relation to an observer who is moving relative to the wave source. In LDV, a laser beam is split into two intersecting beams, creating an interference fringe pattern in the measurement volume. As small particles suspended in the fluid pass through this fringe pattern, they scatter the laser light. The frequency of the scattered light is shifted proportionally to the velocity of the particles, and thus the fluid, in the direction of the fringe pattern. A detector captures this scattered light, and signal processing electronics convert the frequency shift into a velocity measurement. Multiple beams can be used to measure velocity components in different directions simultaneously. LDV systems are known for their high accuracy and temporal resolution, making them suitable for a wide range of applications including aerodynamics, hydrodynamics, and industrial process monitoring. The accuracy is dependent on the concentration and properties of the scattering particles, as well as the optical alignment of the system.