The main principle is introduced, and the relationship between speed of sonic wave and media temperature is deduced. The great merits and existing questions of acoustic pyrometry are shown.
介绍了声学测温的基本原理，推导了声波传播速度与介质温度的关系式，阐述了声学测温的巨大优势和存在问题。
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.
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。
The trajectories of particle movements in a standing wave acoustic field are recorded by fast-speed video camera.
采用可视化实验的方法，拍摄可吸入颗粒在驻波声场中的运动轨迹。
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