| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 96 === The purpose of this thesis is to research and improve the ultrasonic phased array imaging system. In the aspect of scanning system, we use the piezoelectric ceramic with 600 KHz resonance frequency in this system and manufacture a one-dimension transmitting array and a receiving element. By using the beam-controlled technology to trigger the array, we are able to perform the scanning over the target objects. We also apply the independence loop method and the spacing matching method to increase the signals strength of the transmitting array. In the aspect of imaging system, we use the ultrasonic phased array in application of distance measurement is based on TOF (time-of-flight) method. Moreover, with the scanning function that is collocated in front-end circuits; the relative location information of the target objects are collected. Then, after the processing of the LabVIEW graph-controlled programs, 2 Dimensional images of the target objects could be acquired. In order to widen the extent of the system applications, we put the array system together with PTU (pan and tilt unit) and adopt the 9-grid scanning method to enlarge the scope of the output image; separate tests have been physically performed in the lab water tank and undersea environments.
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