Flow Explorer Mini LDA Laser Doppler anemometer by Dantec Dynamics

laserovy-dopplerovsky-anemometr-perex.jpg The anemometer is a compact and portable device for contactless measurement of fluid flow or particle speed (aerosol, droplets, bubbles, and seeding particles). It is a non-intrusive optical method for time and space resolved measurement within single or two-phase environment based on light reflection and refraction. The apparatus performs a single-point measurement of high spatial resolution; by traversing in 2 or 3 dimensions, the entire domain can be observed.


  • measurement of single or two mutually perpendicular components of velocity vector up to ±180 m/s (synchronous 2D measurement)
  • measuring frequency up to 100,000 samples/sec
  • typical size of measuring volume smaller than 1 mm3
  • high speed synchronous measurement of another 4 quantities in addition to LDA signals
  • cyclic processes recording, measurement triggered in by external event
  • when combined with 3D positioning system, complete flow domain measurement
  • no need for calibration of measured velocity due to calibration certificate


Typical applications

  • studies of flow patterns of two-phase flow – bubble flow, aerosols and sprays
  • studies of aerodynamics and hydrodynamics in free/unbounded environment and/or transparent models (pipe and mini/micro-channel flow, air terminal device and nozzle jet flow, flow in rooms)
  • studies on fluid dynamics, turbulence, boundary layer flow
  • flowmeter and anemometer calibration
  • measurement in the cases featured by changes in flow direction and at speeds fluctuating about zero, cyclic and transition flow
  • boundary conditions and input data for numerical simulations


Provided outcomes

  • histograms of velocity and detection (transit) time of particles
  • velocity statistics, mean and rms velocities, calculation of other derived quantities
  • turbulence intensity, estimation of turbulence spectrum


  • MVB OPAVA CZ s.r.o.: Vizualization of water splashing in a scrubber (in the frame of project TH01030820 Complex reduction of gaseous pollutants emission from the small scale units) (2015)

Contact person

Jan Jedelsky, Ph.D., Associate Professor
phone: +420 54114 3266 | e-mail: jedelsky@fme_vutbr_cz

Energy Institute, Department of Thermodynamics and Environmental Engineering
Faculty of Mechanical Engineering, Brno University of Technology
Technicka 2896/2, 616 69 Brno, Czech Republic

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