In this work a composite longitudinal-flexural mode ultrasonic transducer is proposed, designed and experimentally characterized. The transducer is composed of a Langevin transducer and of a displacement amplifier, which is composed of a cylinder shaped base with the same section of the Langevin transducer, of four arms, and of a thin disk acting as a displacement collector. The displacement amplifier is designed to convert the almost flat axial displacement provided by the Langevin transducer at its back end into a flexural deformation that produces the maximum axial displacement at the centre of its front end. Analysis and design and of the actuator are performed by using a FEM software. Besides the designed resonance frequency, the vibrational behaviour of the actuator is analysed also at a close frequency, where comparable performance are found. A prototype of the designed transducer is manufactured and experimentally characterized. Measurements of the electrical input impedance and of the displacement on the front surface are presented.

Design and Experimental Characterization of an Composite Longitudinal-Flexural Mode Ultrasonic Transducer

IULA, Antonio;
2007

Abstract

In this work a composite longitudinal-flexural mode ultrasonic transducer is proposed, designed and experimentally characterized. The transducer is composed of a Langevin transducer and of a displacement amplifier, which is composed of a cylinder shaped base with the same section of the Langevin transducer, of four arms, and of a thin disk acting as a displacement collector. The displacement amplifier is designed to convert the almost flat axial displacement provided by the Langevin transducer at its back end into a flexural deformation that produces the maximum axial displacement at the centre of its front end. Analysis and design and of the actuator are performed by using a FEM software. Besides the designed resonance frequency, the vibrational behaviour of the actuator is analysed also at a close frequency, where comparable performance are found. A prototype of the designed transducer is manufactured and experimentally characterized. Measurements of the electrical input impedance and of the displacement on the front surface are presented.
9781424413843
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/9355
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