Laser Doppler Anemometry

3D Measurements in Fluid Mechanics

3D-MeasurementsDoppler effect(ive)
Laser Doppler Anemometry (LDA) is an optical technique for non-intrusive 1D, 2D and 3D point measurement of flow velocity, turbulence and other flow characteristics based on the Doppler effect causing the frequency shift of the scattered light. It allows for a clearer understanding of fluid mechanics, especially in the field of sediment flow. Furthermore, LDA can be used for the accurate calibration of flow measurements as a reference.

TECHNICAL INFORMATION
3D-LDA systems Flow Explorer from Dantec Dynamic.
Calibrated 2D Flow Explorer system with 2x continuous wave diode-pumped solid-state (DPSS) laser and a BSA processor F600

  • Laser power P0 = 2 x 500 mW
  • Laser wavelengths λ = 532 and 561 nm
  • Focal lengths f = 300, 500, 750 mm
  • Beam spacing 60 mm
  • Probe volume length/diameter 0.7/0.1 – 4.6/0.7 mm/mm
  • 12 bit FFT burst spectrum analyzer 120 MHz and 80 MHz Bragg-cell shift
  • Velocity range -150 – 650 m/s
  • Optical fiber probes for subaquatic use with f = 500 and 250 mm

Calibrated 1D Flow Explorer system with DPSS laser and BSA processor F600

  • Laser power P0 = 35 mW
  • Laser wavelengths λ = 660 nm
  • Focal length f = 300 mm
  • Beam spacing 60 mm
  • Probe volume length/diameter 0.7/0.1 mm/mm
  • 12 bit FFT burst spectrum analyzer 120 MHz and 80 MHz Bragg-cell shift
  • Velocity range -90 – 220 m/s

BSA Flow Software v. 5.20

  • Control of LDA systems and other peripherals, data acquisition and processing, data post-processing and visualization

Automated 3D traversing system 1010 mm x 1010 mm x 1010 mm
Repeatability better than 0.017 mm, adjustable velocity of movement.

3D-Measurements

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