Ultrasonic transducer for ranging measurement with high directionality using parametric transmitting array in air and a method for manufacturing same
US7460439B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 28, 2006 |
| Grant date | Dec 2, 2008 |
| Priority date | — |
| Expiry date | Jan 24, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 f1 and 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.