Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-10-28
2000-04-18
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310322, G01N 2928, H01L 4122
Patent
active
060519134
ABSTRACT:
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.
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Dougherty Thomas M.
Hewlett--Packard Company
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