Laser Doppler Velocimetry (LDV)

Laser Doppler Velocimetry

The ILA GmbH provides LDV systems for measurement of field velocities point-wise. The following are the main application areas of our LDV systems:

  • Research
  • Calibration of velocity sensors and
  • Volume flow rate measurements

Shifted LDV systems are mostly provided to the research area. The systems acquire the velocity in terms of speed and direction (1D or 2D). Preferably, the shifted LDV systems are built based on a Nd:YAG laser.

These laser sources, in comparison to diode lasers, have a very good wave length stability and beam quality. Furthermore, the laser beams are perfectly visible allowing an easier alignment procedure during the measurement. The Laser is integrated inside the probe, in order to avoid the use of expensive optical fibers. The LDV systems of ILA are PC-based. This offers a high flexibility concerning the integration of the measuring system in different applications.

Unshifted LDV systems are used for the calibration of velocity sensors and are based on Nd:YAG or HeNe lasers. They present a very small measurement uncertainty and a minimal distortion (<0,2%) of the interference fringes in the measurement volume. The required precise adjustment of the beam waist occurs at a specific velocity standard. This standard provides a measurement uncertainty of approximately 0.05% and has been developed together with the German National Metrology Institute (PTB-Braunschweig).

Unshifted LDV systems with long focal length are also used for volume flow rate measurement. These systems are optimized in term of analog signal processing for the detection of small amplitudes. This is an essential assumption for measurements in district heating pipes with a small particle diameter and concentration. 


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52428 Jülich | NRW

E-Mail: rd@ila.de
Telefon: +49 2461 690430



ILA_5150 GmbH

Kurbrunnenstraße 24
52066 Aachen | NRW

E-Mail: info@ila5150.de
Telefon: +49 2419 5789814