LDA Laser Doppler Anemometer

Fig. 1.5. A typical velocity signal recorded by a laser Doppler anemometer (LDA) in a liquid flow at NTNU. (v) dentotes the time average of the velocity over the time period displayed. The work was performed as a part of the strategic university program (SUP) entitled CFD Applied to Reactor ProcEss Technology (CARPET) .

The main advantages of laser Doppler anemometry (LDA) relative to pitot tubes and hot-film anemometers (HFA) include ... 

In the data acquisition system there are 380 measmement channels. Temperature is measured inside the facility in 290 different points, out of which 126 are in the ice condenser, 65 are in the structures or in the insulations and 99 are measuring the temperatures of the atmosphere. Temperatures outside the facility are measured in 10 different locations. Pressures (total pressure, pressure difference between compartments, water level hight) are measured in 7 and humidities are measured in 10 different locations. The local gas velocities in the upper compartment are measured with a fiber-optics laser-doppler anemometer system (LDA), equipped with an industrial robot for maneuvering. 

The velocity field in cyclones has been measured using hot-wire anemometers, pitot tubes and, recently, laser-Doppler anemometry (LDA). See Chap. 10 for more information about these techniques. 

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