近年来,超声波技术进步飞快,其应用日益广泛,特别是在汽车方面它的功效相当显著。首先,是在交通管制系统中,采用超声波传感器检测道路车辆的流量及车速。如在日本东京的高速公路上,每隔300米设超声波车辆传感器。其次,是采用超声波传感器作为汽车的防撞装置。利用安装在汽车前后四角的超声波传感器,发现各方面的障碍物,用蜂鸣器和指示灯告诉司机障碍物与汽车之间的大致距离和方 In recent years, the rapid progress of ultrasound technology, its increasingly wide range of applications, especially in the automotive aspects of its effectiveness is quite significant. First of all, in the traffic control system, ultrasonic sensors are used to detect the traffic and speed of road vehicles. For example, an ultrasonic vehicle sensor is installed every 300 meters on the expressway in Tokyo, Japan. Second, the use of ultrasonic sensors as a car collision avoidance device. Use the ultrasonic sensors installed in the four corners of the car, found that obstacles in various aspects, with a buzzer and light to tell the driver the approximate distance between the obstacle and the car and the side