碩士 / 國立臺灣海洋大學 / 電機工程學系 / 93 / This paper forms on ultrasonic arrays fabrication and charcterization
and use the ultrasonic array method principle design and manufacture the ultrasonic head, can use the ultrasonic array to get a beam steering.
Simultaneously we design a transmission and receive arrays can effective control directive beam by step motor.
This paper also according to the ultrasonic receiver principle to conversion the echo signal to the computer and application to image.
This paper according to the beam forming principle to design the ultrasonic arrays, and test some parameter example d33 and resonance frequency, this experiment are already to formulate this element size and standard, the we use the water-repellent process on the transducer according to the matching layer, and test the influence at resonance frequency, bandwidth and impedance, the result prove that add matching layer can improve bandwidth, simultaneously this experiment is already
Success get beam forming exist, beside we have building a underwater ultrasonic image experiment structure, use step motor to turn transmission angular, effective change the transmission angular and we use ultrasonic receiver array get the echo signal.
As to the simulation, we also simulation the ultrasonic image and design the Optimum ultrasonic array, beside we also test the directive sound field, echo signal and image process.
And according to the underwater ultrasonic image experiment structure
Use PXI data receive card, to get the echo wave into the computer and make the initial image process.
| Identifer | oai:union.ndltd.org:TW/093NTOU5442002 |
| Date | January 2005 |
| Creators | jackychen, 陳震寰 |
| Contributors | 張忠誠 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 103 |
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