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本文对不同形状和大小的缺陷的振幅频率特性进行了理论研究,并得出了它的计算表达式。指出:每种缺陷都有其固有的振幅频率特性,最典型的就是相对超声波束轴线有一定倾斜角的平面缺陷。其振幅频率特性有周期地达到最大值的波动特点。证明利用各种缺陷在振幅频率特性上所显示的规律,可以确定它们的种类,即平面缺陷还是体积缺陷。
In this paper, the amplitude and frequency characteristics of different shapes and sizes of defects have been studied theoretically, and its calculation expression has been obtained. It is pointed out that each kind of defect has its own characteristic of amplitude and frequency. The most typical one is plane defect with a certain inclination angle relative to the axis of ultrasonic beam. The amplitude and frequency characteristics of the maximum cycle of fluctuations characteristics. Demonstrate the use of various defects in the amplitude and frequency characteristics of the law shows that they can determine the type, that is, planar defects or volume defects.