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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Line-focusing electromagnetic acoustic transducers for thedetection of slit defects
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Line-focusing electromagnetic acoustic transducers for thedetection of slit defects

机译：线聚焦电磁声换能器，用于检测狭缝缺陷

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摘要

This paper describes the design principles of a line-focusingnelectromagnetic acoustic transducer (LF-EMAT) and the results of anfeasibility test for detecting slit-type defects in metals. The LF-EMATnexcites shear vertical (SV) elastic waves and focuses them to a line inna metal body. It consists of a permanent magnet block and a meanderlinencoil, whose spacing is continuously varied so that the excited SV wavesnbecome coherent on a focal line after traveling oblique paths. Thenmeasured directivity of generation and reception show a sharp peak atnthe designed focal line. The LF-EMATs are then applied to detecting slitndefects in the bottom surface of steel blocks, on which the focal linesnare located. Portions of the scattered defect signals are received bynthe same EMAT. When operated at 4 MHz, the LF-EMATs are capable ofndetecting slits deeper than 0.05 mm. The sensitivity decreases withnliftoff and the LF-EMATs are usable with liftoff up to 0.6 mm
机译：本文介绍了线聚焦电磁声换能器（LF-EMAT）的设计原理以及用于检测金属中的缝隙型缺陷的可行性测试的结果。 LF-EMATnexcites剪切垂直（SV）弹性波并将其聚焦到金属体内的一条线上。它由一个永磁铁块和一个曲折线圈组成，其间距连续变化，因此，在经过倾斜路径后，激发的SV波在焦线上变得相干。所测量的产生和接收的方向性在设计的焦点处显示出一个尖峰。然后将LF-EMAT应用到检测焦线所在的钢块底面的狭缝缺陷中。分散的缺陷信号的一部分由同一EMAT接收。当以4 MHz运行时，LF-EMATs不能检测到深度大于0.05 mm的缝隙。灵敏度随提升而降低，并且LF-EMAT可以在高达0.6 mm的提升条件下使用

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