介绍了钢管接触法超声波探伤缺陷定位方法——手指蘸油触摸法，分析了利用此种方法进行缺陷定位的理论依据。
The author introduces a pipe defect locating method by contact type ultrasonic detection — finger oil dipping touching method and analyses the theoretical basis of defect locating by this method.
超声脉冲回波法以缺陷定位准确、适用范围广、操作方便等优点广泛应用于无损检测。
Ultrasonic echo method is widely applied in non-destructive detection for its advantage of accurate defect locating, wide application, convenient operation and so on.
水下机器人的定位系统利用超声波传感器获取距离信息，同时采用三点定位法计算出位置坐标。
The orientation system of underwater robot captures the distance information by the ultrasonic sensors, and uses thethree points location theory to compute the coordinate of the position.
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