کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5485494 1523194 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhancing the bandwidth of piezoelectric composite transducers for air-coupled non-destructive evaluation
ترجمه فارسی عنوان
افزایش پهنای باند مبدل های کامپوزیتی پیزوالکتریک برای ارزیابی غیر مخرب هوا
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم آکوستیک و فرا صوت
چکیده انگلیسی
This paper details the development of a novel method for increasing the operational bandwidth of piezocomposites without the need for lossy backing material, the aim being to increase fractional bandwith by geometrical design. Removing the need for lossy backing materials, should in turn increase the transmit efficiency in the desired direction of propagation. Finite element analysis has been employed to determine the mode of operation of the new piezocomposite devices and shows good correlation with that derived experimentally. Through a series of practical and analytical methods it has been shown that additional thickness mode resonances can be introduced into the structure by a simple machining process. The shaped composites described in this paper offer increased operational bandwidth. A simple example of a two step thickness design is described to validate and illustrate the principle. A more complex conical design is presented that illustrates a possible tenfold increase in bandwidth from 30 kHz to 300 kHz, operating in air without backing. An illustration of the applicability of this type of transducer technology for frequency agile guided mode non-destructive evaluation is then presented.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics - Volume 75, March 2017, Pages 132-144
نویسندگان
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