Fiber laser Doppler anemometer

E5.2.9.6 Fiber laser Doppler anemometer


  • Fiber coupled laser diode.
  • Fiber coupled beam delivery.
  • Dual beam interference.
  • Spatial interference.
  • Doppler effect.
  • Light scattering
  • Measuring particle speed.
  • Spatial scattering.
  • Seeding particles.
  • Fourier transformation.
Principle of operation

Anemos is a Greek word which means wind. Consequently, a Laser Doppler Anemometer (LDA) is a wind meter using a laser based on the physical effect Christian Doppler discovered in 1842. However, the LDA cannot detect pure wind as a clean air stream; it needs to have particles moving with the wind. These particles move through two crossing laser beams. Due to the coherence of the laser, a spatial interference pattern appears within the crossing zone which looks like Zebra stripes. When particles are moving through the stripes, they scatter the light in preferred directions

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