机器人的应用领域已从汽车制造业扩大到纺织、宇航、医疗、电子、家俱、建筑、仓储及军工等行业，甚至日常生活中出现了各种智能机器人。在机器人上其耳目是极为重要的，只有通过耳目与外界交换信息，从而才能决定它的“行动”。机器人的耳目可以采用光学、红外和超声。本文介绍一种机器人的超声测距方法。 Robotics applications have expanded from automobile manufacturing to the textile, aerospace, medical, electronics, furniture, construction, warehousing and military industries, and even smart robots have emerged in their daily lives. Their eyes and ears on the robot are extremely important, and their “action” can only be determined by exchanging information with the outside world. The eyes and ears of the robot can use optical, infrared and ultrasound. This article describes a robot ultrasonic ranging method.