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通过对７０°探头的测量分析，利用“假想声源”原理建立声场模型，计算出钢轨７０°探头几何超声场分布情况，并对相关的钢轨超声检测问题进行探讨。
Through the measurement and analysis of 70 ° probe, the sound field model is established by using the “hypothetical sound source” principle to calculate the geometric ultrasonic field distribution of the 70 ° probe and the related ultrasonic testing of the rail is discussed.