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空中超声波传感器是指根据发射在空中的超声波遇到物体后反射波束测定工作的。通常用于警报装置、自动门，以及汽车尾部安装的测距仪等。超声波是指人们可听范围20kHZ以上，以340米／秒的速度在空中传播的声波。空中超声波传感器分压电型、磁致伸缩型、静电型、动电型等种类。
Aerial ultrasonic sensor is based on the launch of the ultrasonic waves encountered in the air after the object reflected beam measurement work. Usually used for alarm devices, automatic doors, as well as the car tail mounted range finder and so on. Ultrasound refers to people can hear the range of 20kHZ above, to 340 m / s speed in the airborne sound waves. Ultrasonic ultrasonic sensor voltage divider type, magnetostrictive type, static type, dynamic type and other types.