声波测距

Aiming at some characteristics of liquid asphaltum as more viscosity, higher temperature and lesser fluidity, the principle of a new type measuring range system with sound-wave for measuring level of material of liquid asphaltum is researched.

针对液态沥青粘度大、温度高、流动性差的特点，对实现其料位检测的一种新型声波测距系统的机理进行了研究。

Thus this belt sander has its limitation in practical use.

不过，对测定目标物距离来说，声波运行的速度太慢，因此，声波回声测距法在实用中有其局限性。

Using the time-gain compensation technique to compensate for ultrasonic wave's weaking when transmitting in the air,and reduce the fluctuation of echo signal.The peak time detecting circuit which is composed of full-wave rectification circuit and differential circuit can detect the reach time of echo signal accurately.

和其他方法相比，如激光测距、微波测距等，由于声波在空气中传播速度远远小于光线和无线电波的传播速度，对于时间测量精度的要求远小于激光测距、微波测距等系统，因而超声波测距系统电路易实现、结构简单和造价低，且超声波在传播过程中不受烟雾、空气能见度等因素的影响，在各种场合均得到广泛应用。

Eight sonars on each unit helped them avoid collisions with walls and other robots.

每个机器人上装有声波导航和测距装置，这也使得它们不会碰撞到墙壁与其它的机器人。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。