Elevation aperture control of an ultrasonic transducer

• Main Authors: GREENSTEIN; MICHAEL, MELTON, JR.; HEWLETT E, SEYED-BOLORFOROSH; MIR S
• Format: Patent
• Language: English
• Published: 07.03.1995
• Edition: 6
• 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

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...