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With the deepening of the ultrasonic ranging technology research and ultrasonic dust proof, prevent mist, the unique advantages of non contact, and also have a certain ability to adapt in the bad environment, and the ultrasonic sensor has the advantages of simple structure, small volume, reliable signal processing etc., the application of ultrasonic distance measurement is becoming more and more popular, ultrasonic ranging technology has been widely used in machinery manufacturing, industrial control, electronics, metallurgy, Marine, the universe, petrochemical industry, reverse, etc.