A two-dimensional directional laser Doppler anemometer using a frequency modulated Nd:YAG laser is presented for the first time. The magnitude and sign of the fluid velocity were determined by employing the heterodyne technique without having to use an external frequency shifter.
Inspec keywords: laser velocimetry; Doppler measurement; optical modulation; anemometers; laser velocimeters; ring lasers; fibre optic sensors; solid lasers; optical delay lines
Other keywords:
Subjects: Laser applications; Velocity, acceleration and rotation measurement; Level, flow and volume measurement; Velocity, acceleration and rotation measurement; Laser beam applications; Fibre optic sensors; Solid lasers; Fibre optic sensors; fibre gyros; Laser beam modulation, pulsing and switching; mode locking and tuning; Measurement instrumentation and techniques for fluid dynamics
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