FiberFlow components

image of LDA FiberFlow probes

Today’s FiberFlow systems include the following components:

  • Laser/transmitter to deliver two laser beams to the transmission fibers of the probe. One beam is frequency shifted 40 MHz to allow for the measurement of 0 velocity and flow reversals. Laser powers from 100 mW to 1 W are available. At each power level, three wavelengths are available for 3D systems.
  • Probes in diameters 14, 27, 60 and 112 mm, to fit to the available space at the experiment. Larger diameter enables longer measurement distance.
  • Front optics for the probes. Front optics include front lenses, beam translator modules and beam expanders.
  • Probe supports and benches for mounting and aligning probes to the experiment, and to establish perfectly overlapping measurement volumes in 3D systems with 2 probes.

Older systems include

  • DopplerPower lasers replacing obsolete Argon-Ion lasers
  • Benches for mounting the laser and transmitter optics
image of DopplerPower

Easy replacement of Ar-Ion laser

DopplerPower is a DPSS laser with 2 x 1 W at 488 and 515 nm, ideal to replace a 5 W Ar-Ion laser in a 2D FiberFlow setup. With the same power in both lines, the DopplerPower ensures similar signal quality and data rate in both velocity channels, yielding a higher coincidence rate of the raw data.

The DopplerPower only needs single phase power and no water cooling. The dimensions and weight are much lower than for a comparable Ar-Ion laser. The DopplerPower comes with bench fittings to allow for replacement of an Ar-Ion laser without any additional parts.

Key benefits

  • Compact, air-cooled, low noise
  • Replaces Ar-Ion laser
  • No additional optical parts required
  • Same power in two wavelengths – can be controlled by software
  • Lower operating cost due to low power consumption
  • Single-phase power supply

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