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| 11. | method is mainly used to characterize thin plate materials, without using very high frequency, it can measure |
| 兰姆波法主要用于表征薄板类材料，无需较高检测频率，可以测得板中纵波和横波的声速、板厚和板与板之间的结合特性等，检测精度较高。 |
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| 12. | of sound wave can feel the interference countervail and strengthening of sound in ordinary lab, and measure |
| 本文给出了改进声波干涉实验装置的具体方案,该改进装置可在普通实验室内感受声音的干涉相消和干涉加强现象,并能测定声速和频率。 |
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| 13. | the forward receiving method by mirror and the way of side direction receiving ,when LDV is used to measure |
| 使用二维激光多普勒测速仪(LDV)对圆管中水流进行测速时，对于窗口的设置、利用反射镜前向接收的方法和侧向接收方式等问题,本文进行了探讨，并总结了测量中的一些实际经验。 |
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