Drop-on-Demand(DOD)print heads eject droplets through the air directly to a specified position on a media. Changes of shape and direction of the drops, which may also be followed by detached "satellite drops", usually occur during the motion toward the target. The quality of printing depends on the velocity fluctuations and on the existence of secondary drops. A Laser Doppler Velocimetry technique was applied to analyze the performance of ink jet printing heads close to real operating conditions. The System can provide a statistical description, which includes distributions and average parameters of the main and lateral veloci- Ties of drops.
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