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日本丰田汽车工业公司最近研制成功一种汽车上使用的“反向声纳”安全装置,通过超声波能使司机感知到汽车后方的障碍物;通过显示灯和蜂鸣器,还能知道汽车后方的障碍物与汽车尾部的距离和位置。 “反向声纳”安全装置的工作原理是,以声波在空气中传播的速度(约每秒340米)为基础,
Japan’s Toyota Motor Corporation has recently developed a “reverse sonar” safety device used in cars that uses ultrasonic waves to make the driver aware of the obstacles behind the car. The lights and buzzer also tell you what the rear The distance and location of the obstacle to the rear of the car. The “reverse sonar” safety device works based on the speed at which sound waves travel in the air (about 340 meters per second)