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Laser Doppler Anemometry (LDA), also known as Laser Doppler Velocimetry (LDV), is an optical technique ideal for non-intrusive 1D, 2D, and 3D point measurement of velocity and turbulence distribution in both free flows and internal flows.

The Laser Doppler Anemometer, or LDA, is a widely accepted tool for fluid dynamic investigations in gases and liquids and has been used as such for more than three decades. It is a well-established technique that gives information about flow velocity.

Its non-intrusive principle and directional sensitivity make it very suitable for applications with reversing flow, chemically reacting or high-temperature media, and rotating machinery where physical sensors are difficult or impossible to use. It requires tracer particles in the flow.

The method’s particular advantages are: non-intrusive measurement, high spatial and temporal resolution, no need for calibration, and the ability to measure in reversing flows.