ULTRASONIC LEVEL METER

摘要

An ultrasonic wave-based water level meter includes an ultrasonic sensor for outputting ultrasonic waves toward a first direction, and sensing the ultrasonic waves coming in from the first direction; and a reflector arranged to be separated from the ultrasonic sensor at a predetermined distance. The reflector reflects the ultrasonic waves output from the ultrasonic sensor toward a second direction which is intersectional to the first direction, and reflects ultrasonic waves coming in from the second direction after being reflected from the surface of water.