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Acoustic measurement of bubble size and position in an ink jet printhead

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(1)ACOUSTICS2008/1358 Acoustic measurement of bubble size and position in an ink jet printhead A. Van Der Bosa , R. Jeurissena , J. De Jongb , D. Lohsea , M. Versluisa , H. Reintenb , M. Van Den Bergb , H. Wijshoffb and R. Stevensa a Physics of Fluids, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands b Oce Technology, P.O. Box 101, 5900 MA Venlo, Netherlands An acoustic measurement method of the volume and position of a bubble in an ink jet print head, is presented. The system is driven by a pi¨ezo actuator. The actuator is also used as a sensor by measuring the current through the pi¨ezo. The method used to determine the volume and position of the bubble is based on a linear model of the investigated system. This model predicts the current for a given position and volume of the bubble. The inverse problem is to infer the position and volume of the bubble from the measured current through the pi¨ezo actuator. The solution of the inverse problem is demonstrated. Thus, an acoustical measurement method of these properties is obtained. The results from the acoustical measurement method correspond closely with results from optical measurements. This indicates validity of the presented method..

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