Ultrasonic sensor is the use of ultrasonic characteristics of the development of the sensor. Ultrasound is a mechanical wave whose vibration frequency is higher than that of the sound wave. It is generated by the vibration of the transducer chip under the excitation voltage. It has the characteristics of high frequency, short wavelength, small diffraction phenomenon, especially good directivity, Communication and other characteristics. Ultrasound on liquid, solid penetration ability, especially in the sun opaque solid, it can penetrate the depths of tens of meters.
Ultrasonic encountered impurities or interface will produce a significant reflection of reflected into an echo, hit the living body can produce Doppler effect. Therefore, ultrasonic testing is widely used in industrial, national defense, biomedical and other aspects of ultrasound as a means of detection, must produce ultrasound and receive ultrasound.
The device that performs this function is an ultrasonic distance module, customarily called an ultrasonic transducer, or an ultrasonic probe.