Descriptions are made of a new instrument based on the lowest order asymmetric plate wave excitation and swept frequency amplitude phase display.

介绍基于最低阶反对称板波激励、扫频幅度相位显示的复合材料粘结质量评价的新方法。

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So one-dimensional elastic wave and plate vibration response theory are mainly applied to study the structure and experiments are made to verify the validity of the theory.

所以作者主要是应用一维弹性波理论及板壳振动理论对局部噪声屏蔽进行理论研究，并用试验来验证理论分析的可靠性。

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During the second recording, a phase plate is used to produce a half wave delay of the reference image.

在第二次的记录过程中，利用位相板使参考图像产生半波位相延迟。

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