实验结果表明，超声波传播时间误差在7纳秒以内，达到了设计要求。
The result confirmed that the acoustic travel time error was no more than 7 ns and achieved the design objective.
针对超声波无损压力检测技术，开发了一种采用回振法测量超声波传播时间的装置。
In accordance with the technology of ultrasonic nondestructive pressure measurement, a sing-around device was developed for measuring the propagation time of ultrasonic wave.
根据螺栓的轴向应力与超声波传播时间变化率的关系，作者研究了一种可直接测量螺栓轴向应力的仪器。
On the basis of relationship between bolt axial stress and rate of change in ultrasonic wave transmission time, the author has developed a device to directly measure axial stress in bolts.
在进行超声波传播时间检测前，对采样信号还进行了数字滤波算法以更好的消除噪声影响，提高检测精度。
Before test the ultrasonic propagation time, we also use the digital filtering algorithm in the sampled signal to better eliminate noise and improve accuracy.
在无黑子活动的九个太阳宁静区，研究人员发现声波的传播时间没有这么大的变化。
The researchers also charted sound waves passing through nine quiet regions of the sun, where no sunspots were developing, and found no significant anomalies in the waves' travel time.
如果传播路径上有一个黑子区，（声波的）传播时间将会短一些。
If there is a sunspot region along one of these paths, the travel time will be a little bit shorter.
“我们能探测六万公里深处的黑子，但如果探测更深些或者更靠近太阳表面的位置时，(声波的)传播时间的变化将变得不明显，”Ilonidis说。
"We can detect sunspots at a depth of 60,000 kilometers, but if we try to detect them deeper or closer to the surface, the travel-time shift becomes weaker," Ilonidis says.
“我们能探测六万公里深处的黑子，但如果探测更深些或者更靠近太阳表面的位置时，(声波的)传播时间的变化将变得不明显，”Ilonidis说。
"We can detect sunspots at a depth of 60, 000 kilometers, but if we try to detect them deeper or closer to the surface, the travel-time shift becomes weaker," Ilonidis says.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
基于超声波技术的检测方法，通常需要精确地测量超声波在介质中的传播时间。
The measurement and inspection methods based on ultrasonic technology usually request accurate measuring the propagation time of ultrasonic wave in media.
该设计是以空气中超声波的传播速度为确定条件，利用超声波反射时间为参数来测量待测距离。
The design is based on the velocity of the air ultrasound to determine the conditions for the use of ultrasound reflection time parameters to measure the unknown distance.
分析表明，当由简谐声源所发射的声波在一维非稳定流中传播时，对于某一确定位置，其声压幅度除随时间周期变化外，还受到M和（?）
When a harmonic wave propagates in one-dimensional unsteady flow, the wave amplitude at any x-position will be related with Mach number M and (?)
分析表明，当由简谐声源所发射的声波在一维非稳定流中传播时，对于某一确定位置，其声压幅度除随时间周期变化外，还受到M和（?）
When a harmonic wave propagates in one-dimensional unsteady flow, the wave amplitude at any x-position will be related with Mach number M and (?)
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