A frequency domain characterization method using low frequency ultrasound is put forward to estimate parameters of ultra thin elastic layers, such as: the sound velocity, thickness and density.
本文提出一种定量无损估计超薄弹性层声速、厚度和密度参数的低频超声波频域定征方法。
Currently, employing the ultra-sound inspection method to check the quality of the under-water concrete stake is perfectly correct.
目前国内灌注桩水下混凝土灌注质量完整性检测采用超声法检测准确无误。
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