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Velocity measururment of liquid flow by using Laser Doppler Velocimetry(LDV) | ||
| Tikrit Journal of Pure Science | ||
| Article 1, Volume 16, Issue 4, 2011, Pages 185-194 | ||
| Author | ||
| Kahtan Nofan Abdullah | ||
| Abstract | ||
| In this research, laser Doppler velocimetry (LDV)apparatus used to measure velocity of liquid flow .Doppler signal originated by scattered &reflected light (by moving small glass beads with flow liquid) which detected by photodetector as electrical signal in time domain (voltage-time on the oscilloscope) that is by unique wave shape of Doppler signal which appears as burst shape (packet wave) differs from other waves (resulting from noise produced by chopping of two intersected laser beams by small glass beads &air bubbles). Doppler signal can also be recognized by spectrum analyzer (voltage-frequency) as a high peak at a distinct frequency which differs from other peaks that are with low values peaks belongs to the noise | ||
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