求翻译：铝板厚度已计算出的超声波使用获得的数据接收发送，径向极化电磁声换能器（声换能器）。薄板的厚度介于0.1和0.5毫米，测量使用了这种接触方式高达1.5毫米。正常率横波产生和表检测以及由此产生的波形使用已处理运输时间测量和傅里叶分析。2宽带换能器系统被用来进行测量中心频率约为5兆赫的频率含量分别高达10和20兆赫。最准确的测量厚度薄板已利用傅里叶分析和已经取得的测量精确到0.2%（或0.4流明280流明厚铝片）。离散剪切波回波可以观察到一片厚度为250流明使用较高频率的电磁系统。然而与时间测量这些信号产生精度较低的结果相比，傅里叶分析方法可达到亚微米精度。是什么意思？

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Aluminum plate thickness is calculated using the ultrasound to send the data receiver, the radial polarized electromagnetic acoustic transducer (sound transducer). sheet metal thickness is between 0.1 and 0.5 mm, the measurement has been used this way up to 1.5 mm. Normal rate and a transverse wave

Aluminum sheet thickness has calculated the ultrasonic wave use obtains data receive transmission, radial direction polarization electromagnetism sound transducer (sound transducer).Thin steel plate thickness was situated between 0.1 and 0.5 millimeter, the survey uses this contact way to reach as h

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