| 1. | Measuring thickness by ultrasonic pulse - echo contact method
接触式超声波脉冲回波法测厚 |
| 2. | Nondestructive testing of concrete structures using impact - echo method
冲击回波法检测混凝土结构 |
| 3. | This paper introduces two methods of ultrasonic characterization of thin layers : longitudinal pulse - echo and lamb waves
摘要介绍了两种常用的材料薄层超声表征方法纵波脉冲回波法和兰姆波法。 |
| 4. | The application of longitudinal pulse - echo is relatively simple , which can provide information of the thin layers such as the depth , ultrasonic velocity , attenuation etc
纵波脉冲回波法简单易行，能够获得薄层厚度、声速和衰减等信息。 |
| 5. | Explain the characteristics of piezoelectric crystals and the factors relating to the resonant frequencies of a piezoelectric crystal , and the procedure of the pulse - echo method
说明压电晶体的特性和与压电晶体的共振频率有关的因数，以及脉波回波法的过程。 |
| 6. | Through the spread time of ultrasonic signal is processed by digital correlation method , measuring the velocity of ultrasonic speedily and accurately is achieved
利用超声脉冲回波法在温度箱内测定了某合金材料在20 ~ 60的弹性常数，研究了温度对该材料弹性模量的影响。 |
| 7. | Each of such bodies as tunnel lining , road way and road surface floorslab has only one inspection face , and the shock echo method has become a new technique for detecting thickness and defects
摘要隧道衬砌、路道、路面楼板等只有一个检测面，冲击回波法成为新的厚度及缺陷检测方法。 |
| 8. | The general and unique characteristics of the shock echo method and the foundation pile reflection method reveal the mechanism of the reflection technique as well as the different requirements of frequency domain and time domain for impulse
由冲击回波法与基桩反射法的共性及特性揭示了这种方法的机理及频域与时域检测2种不同施测方法以及对激振的不同要求。 |
