Directivity Study of Dual Source Single Enclosure Ultrasonic Parking Sensors
Date Issued
2008
Date
2008
Author(s)
Lin, Chia-Yu
Abstract
Ultrasonic sensors have been used widely to generate higher directional radiating patterns where piezoelectric units are sparsely distributed in space. In this study, we present a novel design of a phase array ultrasonic sensor based on the concept of vibration decoupling. Decoupling is usually achieved by careful design of a source aperture, which allows piezoelectric discs to be tightly located in the same structure. Our novel design was based on a cylinder with a dumbbell shape groove to decouple the vibration. A finite element method was used to optimize the design. Two piezoelectric discs were adhered to the bottom plate of the sensor whereby a desirable wave generation and detection were controlled adaptively. By electrical steering, the sensor was thus able to operate with the specific fixed phase. Prototypes of the sensor were made and experimental work was conducted to verify the simulation results.
Subjects
ultrasonic sensor
mode shape
Finite element analysis
directivity
parking sensor
Type
thesis
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