本文第一章介绍我们的超声波声速仪的原理和误差分析，并给出它和回呜法的比较。
In the first part of this paper, the principle and the error analysis of our ultrasonic velocimeter are presented, and a comparison with the "Sing Around velocimeter" is given.
声速变化比质量损失变化明显，说明超声波法是一种检测混凝土冻融损伤的简单可靠的方法。
The variation of sound velocity was more obvious than quality loss. It was concluded that ultrasonic techno…
声速变化比质量损失变化明显，说明超声波法是一种检测混凝土冻融损伤的简单可靠的方法。
The variation of sound velocity was more obvious than quality loss. It was concluded that ultrasonic techno…
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