Elevation aperture control of an ultrasonic transducer

An ultrasonic transducer for controlling an elevation aperture utilizes the electric field-induced polarization properties of relaxor ferroelectric materials. The Curie temperature of the material is typically close to room temperature, so that the application of a bias voltage provides piezoelectri...

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Bibliographic Details
Main Authors GREENSTEIN; MICHAEL, MELTON, JR.; HEWLETT E, SEYED-BOLORFOROSH; MIR S
Format Patent
LanguageEnglish
Published 07.03.1995
Edition6
Subjects
DEAF-AID SETS
DIAGNOSIS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
FOR PERFORMING MECHANICAL WORK IN GENERAL
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
HUMAN NECESSITIES
HYGIENE
IDENTIFICATION
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
MEDICAL OR VETERINARY SCIENCE
METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY
PERFORMING OPERATIONS
PUBLIC ADDRESS SYSTEMS
SURGERY
TRANSPORTING
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Summary:An ultrasonic transducer for controlling an elevation aperture utilizes the electric field-induced polarization properties of relaxor ferroelectric materials. The Curie temperature of the material is typically close to room temperature, so that the application of a bias voltage provides piezoelectric activity. By varying the thickness of a dielectric layer that spaces apart the relaxor ferroelectric material from an electrode or providing the bias voltage, the piezoelectric activity can be tailored. That is, degrees of polarization of the relaxor ferroelectric material are varied spatially in correspondence with changes in thickness of the dielectric layer. The effective elevation aperture of the transducer can be varied by adjusting the bias voltage.
Bibliography:Application Number: US19940246593