... (PIV)- measure of the flow of liquid. Particle image velocimetry offers many advantages for the study of fluid flows. Lots of PIV techniques and PIV systems had been developed. However there are no standard evaluation tools for the effeteness and accuracy of PIV systems 2) Laser- induced fluorescence (LIF)- is the optical emission from molecules that have been excited to higher energy level by absorption of electromagnetic radiation Semi anechoic chamber The increasing demand on decreasing exterior noise and interior noise required by law and due to new tools and facilities they are able to meet the various demands of their customers. Car noise is usually measured by driving past a bank of microphone and recording the resulting sound level. For many years the convention has been to use an open-air track, but not surprisingly the ideal weather conditions- wind below five miles per hour and perfectly dry road- very rarely occurs. ...

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