湿型砂原材料质量测定方法(3) 关键词：蠕铁缸盖；蠕化率；超声波声速法；检测 [gap=980]Key words：vermicular iron cylinder head；ven~nicu]Larity；ultrasonic velocity test；inspection
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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…
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