Communications – electrical: acoustic wave systems and devices – Echo systems – Parametric sonar
Reexamination Certificate
2006-09-28
2008-12-02
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Echo systems
Parametric sonar
Reexamination Certificate
active
07460439
ABSTRACT:
A multiple resonances type ultrasonic transducer for a ranging measurement with high directionality using a parametric transmitting array in air, includes an ultrasonic actuator unit formed with a regularly mixing array of first unit actuators having a resonance frequency of f1and second unit actuators having a resonance frequency of f2.The ultrasonic actuator unit generates a difference frequency wave (fd=f1−f2) with high directionality by forming a parametric transmitting array in air through generating two ultrasonic waves with high pressure in air. Further, the transducer includes an ultrasonic sensor unit formed with one or more unit sensors having a resonance frequency of the difference frequency (fd=f1−f2), for sensing a reflected ultrasonic pulse signal from a target.
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patent: 2008/0013405 (2008-01-01), Moon et al.
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Lee Haksue
Moon Wonkyu
Bacon & Thomas PLLC
Pihulic Dan
Postech Academy Industry Foundation
Postech Foundation
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