초록 ▼

An acoustic isolator is formed as a composite of a preform, preferably selected according to a fiber architecture, and an acoustically-attenuating matrix. Fibers in the preform exhibit a first acoustic impedance, and the matrix exhibits a second, lower, acoustic impedance. The preform includes fiber

An acoustic isolator is formed as a composite of a preform, preferably selected according to a fiber architecture, and an acoustically-attenuating matrix. Fibers in the preform exhibit a first acoustic impedance, and the matrix exhibits a second, lower, acoustic impedance. The preform includes fibers arranged in spaced relationship thus defining a plurality of openings which in turn provide voids that are filled by the matrix. An electroacoustic transducer includes an acoustic pulse generator having a front application face and a rear face mounted on a base having a support structure. The base includes an acoustic absorber attached to the rear face of the pulse generator and the acoustic isolator located between the acoustic absorber and a support structure preferably provided in the form of a heat sink. Preferred embodiments of the preform include linear, planar, and integrated fiber systems; a macroporous mesh structure provided in the form of stacked sheets; or an integrated fiber system; The acoustic isolator prevents a substantial percentage of rear-propagated acoustic energy from traveling between the pulse generator and the support structure, thereby greatly reducing ultrasound display artifacts.

대표청구항 ▼

[ What is claimed is:] [1.] An acoustic isolator for use in an electroacoustic transducer, comprising:a composite formed of a preform and a matrix, wherein the preform includes fibers arranged in spaced relationship so as to define a plurality of voids, said voids being substantially filled by a bin

[ What is claimed is:] [1.] An acoustic isolator for use in an electroacoustic transducer, comprising:a composite formed of a preform and a matrix, wherein the preform includes fibers arranged in spaced relationship so as to define a plurality of voids, said voids being substantially filled by a binder, wherein the fibers exhibit a first acoustical impedance and said matrix exhibits a second, lower acoustical impedance, wherein the first acoustical impedance and the second acoustical impedance are selected such that acoustical energy received by said composite is subject to scattering by said fibers and attenuation in said matrix.