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Ultrasonic sensors are sensors that convert ultrasonic signals into other energy signals, usually electrical signals. It is an important branch of sensor products and accounts for a large proportion in the entire sensor industry. Ultrasonic sensors are widely used such as:Liquid level measurement: s
+The sound wave frequency that human ears can hear is 20HZ～20KHz. When the frequency is higher than 20KHz, the human ear cannot hear it. Therefore, we call the sound wave with a frequency higher than 20KHz "ultrasonic wave".Ultrasound has a strong directivity and travels a long distance in the air.
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