Recommended practice for immersed ultrasonic testing by the reflection method using pulsed longitudinal waves 液浸式超声纵波直射探伤方法
But when the pile ' s section changes gradually , there is no reflection waves in the pile 但对于截面渐变的桩中传播的纵波，不产生反射波。
Measurement of the longitudinal wave velocity and attenuation for underwater acoustical materials - pulse - tube method 水声材料纵波声速和衰减的测量脉冲管法
The test results indicate that the above factors do not have much effect on ultrasonic longitudinal wave testing 试验结果表明,以上因素都不会对超声波纵波检测产生很大影响。
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。
Standard practice for detection and evaluation of discontinuities by the immersed pulse - echo ultrasonic method using longitudinal waves 利用纵波的浸入式脉冲回波超声法探测与评价不连续性的标准实施规范
Acoustics - methods for measuring the longitudinal sound speed and attenuation coefficient of rubbers and plastics in the frequency range 1mhz to 10mhz 声学1 10mhz频率范围内橡胶和塑料纵波声速与衰减系数的测量方法
The warning system works by detecting primary waves , which spread from the epicenter of a quake and travel faster than the destructive shear waves 这个警报系统通过探测地震纵波来预报，地震纵波比破坏性强的横波传播速度快。
The warning system works by detecting primary waves , which spread from the epicenter of a quake and travel faster than the destructive shear waves 预警系统的工作原理是探测地震纵波，纵波由震中传出比破环性的横波传播速度快。
