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Multicomponent heterodyne laser Doppler anemometer using chirp-modulated Nd:YAG ring laser and fibre delay lines

Multicomponent heterodyne laser Doppler anemometer using chirp-modulated Nd:YAG ring laser and fibre delay lines

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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.

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