Abstract
A new method of a laser Doppler velocimetry (LDV) for two-dimensional velocity measurement is described. Using a laser diode as a light source, the two velocity components of a light scattering object are simultaneously calculated from the beat frequencies in differential and self-mixing LDVs. By the laser diode frequency change due to the modulation of the injection current, the frequency offsets for the net Doppler beat signals are introduced. Both the magnitude and direction of the velocity components can be measured by the proposed method.
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