Ultrasonic processing is carried ou

Ultrasonic processing is carried out by ultrasonic pulse echo over time. The duration of the ultrasonic pulse from the sensor to the sensing T, the ultrasonic acceleration in air C, the distance between the sensor and the target D are given by the following method: D s CT / 2 Figure 4.1.3.3 is the corresponding system unit diagram. Basis: The output signals the ultrasonic signals at frequencies between 6 mm and 40 KHz. These signals are thought to return from the body to the recipient's head, which is the main cause of the physiological changes. It receives the signal and gives a negative electrical signal in mV