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论述了超声脉冲穿过混凝土缺陷区后频谱曲线的变化，提出一个以功率谱为基础的频谱能量畸变系数．试验证明，可在三维图上用该系数的等高线显示出混凝土内部缺陷
This paper discusses the change of spectrum curve after the ultrasonic pulse passes through the concrete defect area, and proposes a spectral energy distortion coefficient based on the power spectrum. Tests have shown that the internal defects of concrete can be displayed on the three-dimensional map using the contour of the coefficient.