A theoretical equation of surface wave grating diffraction on liquid metal surface is established based on hydrodynamic equations and grating diffraction principle.
以流体动力学方程和光栅衍射原理为基础，得到了研究液态金属表面特性的理论方程序。
When the other condition is the same, wave time for ultrasonic wave pass through the good and the flaw CFST are different, this thesis is based on theoretical principle to start the research.
当其它条件相同时，超声波通过有缺陷的钢管混凝土和无缺陷的声时值不相同，本文即以次为理论基础，开展研究。
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