相控阵
传感器
声学
工程类
模式(计算机接口)
过程(计算)
超声波传感器
电子工程
计算机科学
电气工程
物理
天线(收音机)
操作系统
作者
Konstantinos Tzaferis,Morteza Tabatabaeipour,Gordon Dobie,S. Gareth Pierce,David Lines,Charles MacLeod,Anthony Gachagan
出处
期刊:Lecture notes in civil engineering
日期:2022-06-21
卷期号:: 79-88
标识
DOI:10.1007/978-3-031-07322-9_9
摘要
Asset inspection of large structures such as storage tanks in the oil, gas and petrochemical industry is a challenging and time-consuming process. Compared to the state-of-the-art inspection methods of these structures using ultrasonic bulk wave phased array techniques, guided waves provide a mechanism for monitoring inaccessible areas and increasing the testing range to speed up the inspection process. Combining these two approaches, an efficient inspection scheme can be achieved. For this purpose, in this work, the possibility of exciting a single higher order guided wave mode at a low dispersion region is examined, using a conventional linear phased array on a 10 mm thick sample. An analytical model based on modal analysis is derived. Then, the time delays across each element of the array are optimally selected and a necessary condition on the pitch is provided, to enhance the purity of the desired mode. The results are promising, illustrating that single mode excitation is possible at high frequency-thickness products, greater or equal than 15 MHz $$\cdot $$ mm. Furthermore, the phased array transducer allows for dynamic mode selection capabilities; that is, feeding the appropriate excitation signals on each channel, different modes can be excited, without having to physically alter the transducer configuration.
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