High stability laser sources for Laser Doppler Velocimetry (LDV) and Particle Image Velocimetry (PIV)


Laser Doppler Velocimetry (LDV) is a technique to measure the flow velocity of a fluid. A non-destructive real-time method related to Particle Image Velocimetry (PIV). Laser systems are critical to ensure precise and accurate results.


Particle Image Velocimetry (PIV) is commonly used in many different areas, such as combustion, aerosol analysis, pipe flows, and wind tunnel experiments.


The Novanta laser beams offer:


  • Long coherence length and a high level of pointing stability to ensure a static interference pattern in the region of the flow
  • It exhibits stable output as the system is measuring small fluctuations in the reflected light.
  • A single longitudinal mode (SLM) laser is ideal, provided it is locked to that single mode and does not suffer mode hop which causes sharp output changes that would invalidate results
  • The power requirement is proportional to the size of the sample that needs to be measured with a large sample requiring higher powers
  • The beam pointing stability is also crucial as any movement in the light sheet will artificially corrupt the velocity measurements. A range of laser wavelengths can be used depending on the sensitivity of the measurement camera
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