ULTRASONIC DEVICES INCLUDING ACOUSTICALLY MATCHED REGIONS THEREIN

ULTRASONIC DEVICES INCLUDING ACOUSTICALLY MATCHED REGIONS THEREIN

Ultrasonic devices include a transducer having a piezoelectric element therein that may operate as an acoustic signal receiving surface and/or an acoustic signal generating surface. At least one acoustic matching layer is provided on the piezoelectric element. This at least one acoustic matching lay...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: Buckland, Justin Rorke
Format: Patent
Sprache:eng
Schlagworte:
ACOUSTICS
ACOUSTICS NOT OTHERWISE PROVIDED FOR
ELECTRICITY
FOR PERFORMING MECHANICAL WORK IN GENERAL
GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY
METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL
MUSICAL INSTRUMENTS
PERFORMING OPERATIONS
PHYSICS
SOUND-PRODUCING DEVICES
TESTING
TRANSPORTING
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Beschreibung
Zusammenfassung:Ultrasonic devices include a transducer having a piezoelectric element therein that may operate as an acoustic signal receiving surface and/or an acoustic signal generating surface. At least one acoustic matching layer is provided on the piezoelectric element. This at least one acoustic matching layer may be configured as a composite of N acoustic matching layers, with a first of the N acoustic matching layers contacting the primary surface of the piezoelectric element. This first acoustic matching layer may have an acoustic impedance equivalent to ZL1, where N is a positive integer greater than zero. In some embodiments of the invention, the magnitude of ZL1 may be defined as: 0.75 ((Zp)N+1(Zg))1/(N+2)≤ZL1≤1.25 ((Zp)N+1(Zg))1/(N+2), where Zp is the acoustic impedance of the piezoelectric element (e.g., lead zirconate titanate (PZT)) and Zg is the acoustic impedance of a compatible gas.