Integrated 3D LDA

Submersible 3D LDA in recirculating water tank

Streamlined 3D LDA optics for wind tunnels and water channels

Simultaneous measurement of 3 velocity components using standard optical probes is a challenge. When the optics are exposed to the flow forces, keeping individual probes aligned is difficult, and the optics and mounting structure typically disturb the flow significantly.

The integrated streamlined probe mitigates these challenges. The integration of all transmitting and receiving optics in one probe ensures stable alignment and a simpler mounting structure. The streamlined probe design ensures minimum flow disturbance.

In combination with a traverse and a rigid fixture of the probe, the system can be moved while maintaining alignment and calibration. The entire system – traverse, calibration, automatic measurements and analysis – is operated from dedicated software – BSA Flow.

Components for submersible 3D LDA system

  • 3 FiberFlow Laser Transmitters
    • generate 3 pairs of beams (with/without frequency shift) at 3 wavelengths
  • Fiber-optical connection to the probe
  • Streamlined strut
    • Holds the probe
    • Carries cables
    • Connects to a traverse
    • Allows rotation of the probe around its axis
  • Streamlined probe containing
    • Optics for emitting 6 laser beams
    • Receiver optics
    • Alignment screws
  • Burst Spectrum Analyzer
    • connection to receiving fiber from probe
    • color separation and filtering of received light
    • Photomultipliers
  • BSA Flow Software
    • Controls hardware, data acquisition and storage, analysis and presentation of results
  • PC
  • Calibration tools
    • Pinhole on 3-axis manual traverse for measurement of beam directions
    • Spreadsheet for calculation of fringe spacings (calibration factors) for each wavelength and calculation of the co-ordinate transformation matrix
  • Traverse mechanism (optional)

Components

Seeding Generators

Seeding Generators

Dantec Dynamics offers liquid and powder seeding generators for LDA and PIV, and fog generators for LDA and flow visualization
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PCs and Workstations

PCs and Workstations

PC or Workstation to control your measurement system; store, analyze and post-process the data; and visualize the results
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Traverse Systems

Traverse Systems

Map fluid velocity in space and perform boundary layer measurements with this high resolution system
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BSA Flow Software

BSA Flow Software

Combined with Dantec’s LDA processors and optical LDA systems, BSA Flow Software provides an integrated, flexible, and easy-to-use solution for all LDA fluids experiments
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Burst Spectrum Analyzer

Burst Spectrum Analyzer

Fast and powerful all-in-one processor for LDA & PDA systems
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Download Library

TITLE
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FILE
TITLE
AUTHOR(S)
YEAR
DOWNLOAD FILE
AUTHOR(S)

R. Theunissen, P. Gjelstrup

YEAR

2018

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AUTHOR(S)

Sophie Herpin, Laurent Perret, Romain Mathis, Christian Tanguy, Jean-Jacques Lasserre

YEAR

2018

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PDF
AUTHOR(S)

Palle Gjelstrup

YEAR

2009

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AUTHOR(S)

P. Gjelstrup, H. Nobach, F.E. Jørgensen, K. E. Meyer

YEAR

2000

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Learn more about the Integrated 3D LDA system today

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